C M Y CM MY CY CMY K · starting the engine, as a check to show the light is working. If the wait-to-start light comes on, the glow plug system is required and operating. Wait until

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20_MUL_3.0L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458629B_2019SEP09.ai 1 9/4/2019 8:32:10 AM20_MUL_3.0L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458629B_2019SEP09.ai 1 9/4/2019 8:32:10 AM

Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-U.S./Canada-13336148) - 2020 - CRC - 9/5/19

Contents Introduction . . . . . . . . . . . . . . . . . . . . . . 2

Instruments and Controls . . . . . . . . 5

Driving and Operating . . . . . . . . . . 14

Vehicle Care . . . . . . . . . . . . . . . . . . . . 35

Service and Maintenance . . . . . . . 54

Technical Data . . . . . . . . . . . . . . . . . 64

Index . . . . . . . . . . . . . . . . . . . . . 67


2 Introduction

IntroductionThe names, logos, emblems,slogans, vehicle model names, andvehicle body designs appearing inthis manual including, but not limitedto, GM, the GM logo, CHEVROLET,GMC, the CHEVROLET and GMCTruck Emblems, SILVERADO,SIERRA, and Duramax aretrademarks and/or service marks ofGeneral Motors LLC, itssubsidiaries, affiliates, or licensors.

For vehicles first sold in Canada,substitute the name “GeneralMotors of Canada Company” forGMC and Chevrolet Motor Divisionwherever they appear in thismanual.

This manual describes features thatmay or may not be on the vehiclebecause of optional equipment that

was not purchased on the vehicle,model variants, countryspecifications, features/applicationsthat may not be available in yourregion, or changes subsequent tothe printing of this owner’s manual.

Refer to the purchasedocumentation relating to yourspecific vehicle to confirm thefeatures.

This manual contains informationthat pertains to the operation of thediesel engine. It also contains theDiesel Maintenance Schedule. Thesections in this manual correspondto the sections in the owner’smanual. This manual, along with theowner’s manual, will assist you inthe proper use and maintenance ofthe vehicle.

Keep this manual in the vehicle forquick reference.

Canadian Vehicle OwnersA French language manual can beobtained from your dealer, atwww.helminc.com, or from:

Propriétaires Canadiens

On peut obtenir un exemplaire dece guide en français auprès duconcessionnaire ou à l'adressesuivante:

Helm, IncorporatedAttention: Customer Service47911 Halyard DrivePlymouth, MI 48170USA

Using this SupplementThis supplement containsinformation specific to the uniquecomponents of the vehicle. It doesnot explain everything you need toknow about the vehicle. Read thissupplement along with the owner’smanual to learn about the vehicle'sfeatures and controls.

Litho in U.S.A.Part No. 84458629 B Second Printing ©2019 General Motors LLC. All Rights Reserved.


Introduction 3

Index

A good place to look for what youneed is the Index in the back of thissupplement. It is an alphabetical listof what is in the supplement, andthe page number where you willfind it.


4 Introduction

2 NOTES


Instruments and Controls 5

Instruments andControls

Warning Lights, Gauges, andIndicators

Instrument Cluster . . . . . . . . . . . . . . 6Malfunction Indicator Lamp

(Check Engine Light) . . . . . . . . . 10Wait-to-Start Light . . . . . . . . . . . . . . 11Diesel Exhaust Fluid (DEF)

Warning Light . . . . . . . . . . . . . . . . 12

Information DisplaysDriver Information

Center (DIC) . . . . . . . . . . . . . . . . . 12


6 Instruments and Controls

Warning Lights, Gauges, and Indicators

Instrument Cluster

Base Level Chevrolet English Cluster, Metric Similar



Base Level GMC English Cluster, Metric Similar



Uplevel GMC English Cluster, Metric Similar



Uplevel Chevrolet English Cluster, Metric Similar



Malfunction IndicatorLamp (Check EngineLight)This light is part of the vehicle’semission control on-boarddiagnostic system. If this light is onwhile the engine is running, amalfunction has been detected andthe vehicle may require service. Thelight should come on to show that itis working when the ignition is onwith the engine not running. See“Ignition Positions” in the owner’smanual.

This light may also come on whenthe system has detected a problemwith the Diesel Exhaust Fluid (DEF)management system. See DieselExhaust Fluid 0 20.

Malfunctions are often indicated bythe system before any problem isnoticeable. Being aware of the lightand seeking service promptly whenit comes on may prevent damage.

Caution

If the vehicle is driven continuallywith this light on, the emissioncontrol system may not work aswell, the fuel economy may belower, and the vehicle may notrun smoothly. This could lead tocostly repairs that might not becovered by the vehicle warranty.

Caution

Modifications to the engine,transmission, exhaust, intake,or fuel system, or the use ofreplacement tires that do notmeet the original tirespecifications, can cause this lightto come on. This could lead to

(Continued)

Caution (Continued)

costly repairs not covered by thevehicle warranty. This could alsoaffect the vehicle’s ability to passan Emissions Inspection/Maintenance test. SeeAccessories and Modifications0 35.

When the light is on, a malfunctionhas been detected. Diagnosis andservice may be required.

Poor fuel quality can causeinefficient engine operation and poordriveability, which may go awayonce the engine is warmed up.If this occurs, change the fuel brand.It may require at least one full tankof the proper fuel to turn the light off.See Fuel for Diesel Engines 0 25.

If the light remains on, see yourdealer.



Emissions Inspection andMaintenance Programs

If the vehicle requires an EmissionsInspection/Maintenance test, thetest equipment will likely connect tothe vehicle's Data LinkConnector (DLC).

The DLC is under the instrumentpanel to the left of the steeringwheel. Connecting devices that arenot used to perform an EmissionsInspection/Maintenance test or toservice the vehicle may affectvehicle operation. See “Add-OnElectrical Equipment” in the owner’smanual. See your dealer ifassistance is needed.

The vehicle may not passinspection if:

. The light is on when the engineis running.

. The light does not come onwhen the ignition is on with theengine not running.

. Critical emission control systemshave not been completelydiagnosed. If this happens, thevehicle would not be ready forinspection and might requireseveral days of routine drivingbefore the system is ready forinspection. This can happen ifthe 12-volt battery has recentlybeen replaced or run down, or ifthe vehicle has recently beenserviced.

See your dealer if the vehicle willnot pass or cannot be made readyfor the test.

Wait-to-Start Light

This light comes on briefly whilestarting the engine, as a check toshow the light is working.

If the wait-to-start light comes on,the glow plug system is requiredand operating. Wait until the lightturns off before starting the engine.This light may not come on in warmtemperatures.

See Starting the Diesel Engine 0 14.



Diesel Exhaust Fluid(DEF) Warning Light

This light, a Driver InformationCenter (DIC) message, and a chimecome on when there is an issue withthe Diesel Exhaust Fluid.

If the DEF level has not beencorrected, the light will continue toflash when the vehicle is started.The vehicle's speed may also belimited.

Also see Diesel Exhaust Fluid 0 20.

Information Displays

Driver InformationCenter (DIC)The DIC is in the instrument cluster.The DIC comes on when the ignitionis on.

A Duramax diesel vehicle may havethe following additional DIC menuitems:

DEF : Displays the Diesel ExhaustFluid (DEF) level as a bar graphwith individual segments thatilluminate from Empty (E) to Full (F).When LOW appears on the displayand the segments turn red, addDEF as soon as possible. For aguide on how much DEF to add,see Diesel Exhaust Fluid 0 20.

Fuel Filter Life Remaining : Thisdisplay shows an estimate of thefuel filter's remaining useful life.If 90% Fuel Filter Life Remaining isdisplayed, it means 90% of thecurrent fuel filter life remains. Thefuel filter life system will alert when

to change the fuel filter on aschedule consistent with yourdriving conditions.

When the remaining fuel filter life islow, the CHANGE FUEL FILTERmessage will appear on the display.Change the fuel filter as soon aspossible.

Fuel Filter Life Reset : Reset theFuel Filter Life Remaining displayafter each fuel filter change. It willnot reset itself. Also, be careful notto reset the display at any time otherthan when the fuel filter has justbeen changed because it cannot bereset accurately until the next fuelfilter change. The fuel filter life willchange to 100% when the systemhas been reset. To reset the system,press and hold the thumbwheel fortwo seconds while Fuel Filter LifeRemaining is displayed on the DIC.

Engine Air Filter Life : Displays anestimate of the engine air filter’sremaining useful life and the state ofthe system. Engine Air Filter Life95% means 95% of the current airfilter life remains. Messages willdisplay based on the engine air filter



life and the state of the system.When the REPLACE AT NEXT OILCHANGE message displays, theengine air filter should be replacedat the time of the next oil change.When the REPLACE SOONmessage displays, the engine airfilter should be replaced at theearliest convenience. The Air FilterLife display must be reset after theengine air filter replacement. Toreset, see Engine Air Filter LifeSystem 0 41.


14 Driving and Operating

Driving andOperating

Starting and OperatingStarting the Diesel Engine . . . . . 14Engine Heater . . . . . . . . . . . . . . . . . 16

Diesel Particulate FilterDiesel Particulate Filter . . . . . . . . 17

Diesel Exhaust FluidDiesel Exhaust Fluid . . . . . . . . . . . 20

BrakesExhaust Brake . . . . . . . . . . . . . . . . . 24

FuelTop Tier Fuel . . . . . . . . . . . . . . . . . . 24Fuel Additives . . . . . . . . . . . . . . . . . 25Fuel for Diesel Engines . . . . . . . . 25Biodiesel . . . . . . . . . . . . . . . . . . . . . . . 26Cold Weather Operation . . . . . . . 27Water in Fuel . . . . . . . . . . . . . . . . . . 27Running Out of Fuel . . . . . . . . . . . 30

Fuel Filter Replacement . . . . . . . 31Filling the Tank . . . . . . . . . . . . . . . . 31Filling a Portable Fuel

Container . . . . . . . . . . . . . . . . . . . . . 34

Trailer TowingTrailer Towing . . . . . . . . . . . . . . . . . . 34

Starting andOperating

Starting the DieselEngineThe diesel engine starts differentlythan a gasoline engine.

Move the shift lever to P (Park) orN (Neutral). To restart the enginewhen the vehicle is already moving,use N (Neutral) only.

Caution

Do not try to shift to P (Park) if thevehicle is moving. If you do, youcould damage the transmission.Shift to P (Park) only when thevehicle is stopped.

Starting the Engine

1. Place your foot on the brakeand press ENGINESTART/STOP.


Driving and Operating 15

Observe the wait-to-start light.See Wait-to-Start Light 0 11.This light may not come on ifthe engine is warm.

2. The wait-to-start light may beilluminated, depending ontemperature conditions. Therewill be a delay in enginecranking after pressingENGINE START/STOP basedon temperature conditions. Inextremely cold temperaturesthe delay will be longer. At theend of the delay the engine willbegin to crank and will continueto crank until the engine starts.

Caution

If the wait-to-start light stays onafter starting the vehicle, thevehicle may not run properly.Have the vehicle servicedright away.

3. If the engine does not startafter 15 seconds of cranking,turn the ignition off. Wait

one minute for the crankingmotor to cool, then try thesame steps again.

If you are trying to start the engineafter you have run out of fuel, followthe steps in Running Out of Fuel0 30.

When the engine is cold, let it runfor a few minutes before driving.This lets oil pressure build up. Theengine will sound louder when itis cold.

For turbo protection, engine powerat speeds above idle may be limitedif the engine is cold. This protectioncan last up to a maximum of40 seconds at extreme cold coolantand ambient temperatures.

Cold Weather Starting

Use the recommended engine oilwhen the outside temperaturedrops below freezing. See EngineOil 0 38. When the outsidetemperature drops below –18 °C(0 °F), use of the engine coolantheater is recommended.

If you experience longer crankingtimes, notice an unusual amount ofexhaust smoke, or are at higherelevations (over 2 135 m or 7,000 ft),you may use the engine heater. See“Engine Heater” in the owner’smanual.

See Fuel for Diesel Engines 0 25 forinformation on what fuel to use incold weather.

If the Diesel Engine Will NotStart

If the vehicle runs out of fuel, seeRunning Out of Fuel 0 30.

If the vehicle is not out of fuel, andthe engine will not start:

Place your foot on the brake andpress ENGINE START/STOP.

If the wait-to-start light does not gooff, wait a few seconds, then trystarting the engine again. See yourdealer as soon as possible for astarting system check.



If the wait-to-start light comes onand then goes off and you know thebattery is charged, but the enginestill will not start, the vehicle needsservice.

If the wait-to-start light does notcome on when the engine is cold,the vehicle needs service.

If the battery does not have enoughcharge to start the engine, see“Battery” in the owner’s manual.

Check that the correct engine oilhas been used and changed atappropriate intervals. If the wrong oilis used, the engine may be harderto start.

Be sure to use the proper fuel forexisting weather conditions. SeeFuel for Diesel Engines 0 25.

If the engine starts, runs a shorttime, then stops, the vehicle needsservice.

{ Warning

Do not use gasoline or startingaids, such as ether, in the airintake. They could damage theengine, which may not becovered by the vehicle warranty.They could also cause a fire,which could cause seriouspersonal injury.

Engine Idle Variations

Under certain conditions the engineidle speed can vary or be elevated.Change in idle speed is normal anddoes not indicate a problem. Normalconditions that can raise idle speedare low voltage, DPF regeneration,air conditioning compressor loads,and engine warmup. These speedscan range from approximately 600to 1000 rpm.

Engine Heater

{ Warning

Do not plug in the engine blockheater while the vehicle is parkedin a garage or under a carport.Property damage or personalinjury may result. Always park thevehicle in a clear open area awayfrom buildings or structures.

If equipped, the engine heater canprovide easier starting in coldweather conditions at or below−18 °C (0 °F).

For engine heater operation, see“Engine Heater” in the owner’smanual.



Diesel ParticulateFilterThe exhaust system has a DieselParticulate Filter (DPF) to reducevehicle emissions. On someexhaust systems with a DPF, theexhaust cooler mixes air with theexhaust to lower the temperaturebefore it leaves the tailpipe.

The DPF, the tailpipe, and otherexhaust system components mustnot be altered. Inspect regularly andclean any mud or dirt from theexhaust cooler, especially where theexhaust cooler connects to thetailpipe and the openings wherefresh air enters the cooler.

The DPF will clean itself as part ofnormal operation. Several factorsincluding fuel consumed, hours ofengine operation, and miles drivenare monitored by the Engine ControlModule (ECM). The self-cleaningoccurs approximately once per tankof fuel.

Vehicles with the DPF havespecific fuel and engine oilrequirements. See Fuel for DieselEngines 0 25 andEngine Oil 0 38.

Caution

Damage can occur to the DPFcomponents if the required UltraLow Sulfur Diesel (15 ppm sulfurmaximum) fuel and either CJ-4 orCK-4 engine oil are not used.This damage would not becovered by the vehicle warranty.

Under certain conditions, such asidling or very short trips, theself-cleaning process has lessefficiency and cannot be completed.

To resolve this, continue drivingsafely at a steady speed as close tothe posted speed limit as possible,preferably without stopping, until themessage turns off. This can take upto 30 minutes.

{ Warning

During DPF self cleaning orduring extended idling in P (Park),the exhaust system and exhaustgases are very hot. Things thatburn could touch hot exhaustparts under the vehicle and ignite.You or others could be burned.Do not park, or idle for anextended period of time, near orover papers, leaves, dry grass,or other things that can burn.Keep the exhaust area clear ofmaterial that could ignite or burn.See “Parking over Things ThatBurn” in the owner’s manual.

Caution

Avoid extended idling becausethe DPF system is not capable ofself-cleaning at idle. Duringextended idling, monitor theinstrument cluster lights and DIC

(Continued)



Caution (Continued)

for messages and takeappropriate action. Continuedidling with the warning light/message on could cause damageto the DPF requiring repair andpossible replacement that mightnot be covered by the vehiclewarranty.

During self-cleaning there will be achange in the exhaust sound andengine idle speed. Along with this, aburning smell and reduction in fueleconomy may be noticed. This isnormal.

If the vehicle is idled or driven onvery short trips with the DPFwarning message on and theexhaust filter is not cleaned asrequired, the malfunction indicatorlamp and a DIC message willdisplay. See your dealer. Also seeMalfunction Indicator Lamp (CheckEngine Light) 0 10.

If equipped with PowerTake-Off (PTO), monitor theinstrument cluster for lights relatedto the DPF.

See Accessories and Modifications0 35 if you are adding accessoriesor modifying the vehicle.

Manual Regeneration of DieselParticulate Filter

This feature is only available onFleet and Commercial vehicles.

To verify that the vehicle has thisfeature, refer to the Vehicle ServiceParts Identification label (SPID) forRPO code FPF or seewww.gmupfitter.com to contact theGM Upfitter Integration Group.

If equipped, this feature allows formanual cleaning/regeneration of theDPF when it is unable to cleanitself. It may be necessary toperform manual regeneration ifdriving conditions — such asextended slow speed, stop-and-gotraffic, extended idling, short drivecycles, or stationary PTO operation— prevent DPF self-cleaning.

Manual regeneration can only beused when the DPF has become atleast 90% full. At 100% full, it willattempt to automatically self-clean ifproper driving conditions are met.The DPF will clean itself if thevehicle can be driven for about30 minutes.

A DIC message displays whenmanual regeneration is possible.

Scroll through the DIC pages to findthe Exhaust Cleaning menu.Depending on whether the vehiclehas a base or uplevel cluster, it maybe under the Settings menu.

If the vehicle cannot be stoppedwhen the DIC message firstindicates cleaning is available,automatic self-cleaning may havebegun. If conditions cannot be metfor self-cleaning to complete, andmanual regeneration is selected, itmay take up to four minutes for thesystem to switch to manualregeneration. When the switchoccurs, a DIC message prompts tostart the cleaning process.



{ Warning

Do not leave the vehicle duringthe regeneration.

Make sure that there are noflammable materials near themuffler, DPF, and exhaust pipewhich may result in a fire.

The temperature of exhaustgases is high enough to burn you.You and others could be seriouslyinjured.

Before starting manualregeneration, make sure all of thefollowing safety conditions are met:

. The vehicle is parked on levelground, away from anyflammable materials.

. The vehicle is parked outdoors,away from any walls orbuildings.

. The vehicle is at least 3 m (10 ft)from any obstructions ormaterials that may combustor melt.

. The shift lever is in P (Park).

. The fuel tank is at leastone-eighth full.

. All fluids are at the proper level.

. No diagnostic trouble codeshave been set, and themalfunction indicator lamp isnot on.

. The engine coolant temperatureis above 71 °C (160 °F).

After making sure all safetyconditions have been met, press thetrip odometer reset stem orthumbwheel on the steering wheelfor at least one second to selectStart on the infotainment display.

Follow the instructions in the DICmessages. Touch ACCEPT toacknowledge that all of these safetyconditions have been met and toactivate regeneration.

If the infotainment display returns tothe previous screen, then one ormore of the necessary safetyconditions has not been met. If youcannot determine which conditionhas not been met, seewww.gmupfitter.com to contact theGM Upfitter Integration Group.

Continue to follow the instructions inthe DIC messages. Hold theexhaust brake switch on the centerstack below the climate controls formore than three seconds, and thenrelease it, to begin the regenerationprocess.

If the EXHAUST BRAKE ONmessage displays, then the switchwas released too soon. Press itagain to turn off the exhaust brake,then try again when the DICmessage prompts.

When manual regeneration begins,the engine speed increases, theengine cooling fan sound increases,and a DIC message indicates thatcleaning is in progress.



A DIC message will display whencleaning is complete. Cleaningcould take up to 30 minutes. Uponcompletion, the engine will return tonormal idle, but exhaustcomponents will remain hot forseveral minutes. Do not move thevehicle until the exhaust has hadtime to cool. Manual regenerationcan be canceled at any time bypressing the brake pedal or byturning the engine off. Unusualnoises may be heard if regenerationis interrupted.

Diesel Exhaust Fluid

{ Warning

Avoid getting Diesel ExhaustFluid (DEF) on your skin or inyour eyes as it could causeirritation. For more safety,handling, and storage information,see the Diesel Exhaust Fluidcontainer label.

Caution

Use only DEF that is GMapproved, or fluid containing theAPI certified or ISO 22241 label.The use of other fluids coulddamage the system, requiringcostly repairs that will not becovered by the vehicle warranty.

Caution

Do not mix fuel with DEF, and donot put DEF in the fuel tank. Thiscould lead to costly repairs thatmight not be covered by thevehicle warranty.

Diesel Exhaust Fluid (DEF) is usedwith diesel engines to reduce theamount of regulated emissionsproduced. Products such as AdBlueare types of DEF. The fluid level inthe DEF tank must be maintainedfor the vehicle to run properly. DEFis not a fuel additive. DEF freezeswhen exposed to temperaturesbelow −11 °C (12 °F). For DEF tankcapacity see Capacities andSpecifications 0 65.

It is normal to hear the DEF systempurge fluid back into the tank afterthe vehicle is shut off.



Locating Diesel Exhaust Fluid

DEF can be purchased at yourauthorized dealers. Additionally,some diesel truck fueling stations orretailers may have DEF forpurchase. For vehicles with anactive OnStar or connected servicesplan, OnStar can help to locate aDEF retailer. See “CustomerAssistance Offices” in the owner’smanual for phone numbers to assistin contacting a GM dealer. SeeRecommended Fluids andLubricants 0 61.

Filling the DEF Tank

Crew Cab

Double Cab

The blue DEF cap is behind thefuel/DEF door. Do not remove thefuel and DEF caps at the sametime. Fill diesel fuel and DEFindependently. Turn the DEF capcounterclockwise to remove.

In cold conditions DEF can freeze inthe DEF fill pipe opening. If thisprevents the filling of the DEF tank,place the vehicle in a warm garageovernight.



Fill the DEF tank on level groundand with the vehicle off. Whenadding DEF, it is recommended tofully fill the DEF tank. For DEF tank

capacity see Capacities andSpecifications 0 65. When addingDEF to an empty or very low tank,

always add at least 7.5L (2 gal) offluid to release the vehicle fromspeed limitation.

If DEF is added under freezingconditions it may require less fluid tofill the DEF tank.

When fluid reaches the top of theDEF fill pipe, stop filling. Do not topoff the DEF tank. If using a bottle orjug to refill DEF, follow theinstructions on the container labeland use a dedicated fill aid.

Caution

Do not overfill the DEF tank anddo not allow DEF to contact thefinished surfaces of the vehicle,as it could damage the vehiclefinish. If DEF is spilled duringfilling, wipe any affected surfacewith a damp cloth.

When replacing the DEF cap, turn itclockwise until it clicks. Make surethe cap is fully installed.

Push the fuel/DEF door closed.



DEF Low

As the DEF level drops, warningswill automatically be displayed in theDriver Information Center (DIC).Select Vehicle Information in theDIC to view DEF level status. SeeDriver Information Center (DIC)0 12.

Refill the DEF tank at the firstopportunity after a low warningindication to avoid vehicle speedlimitations.

It may take some time for thevehicle to detect that DEF has beenadded. If there was a vehicle speedlimitation, it will be removedgradually and it may take severalkilometers/miles for the DICmessage to update.

If DEF is added under freezingconditions, additional time may berequired to remove speedlimitations.

The DEF range DIC message firstdisplays at approximately 1 600 km(1,000 mi). This message appearsagain at approximately 500 km

(300 mi) of remaining range beforethe exhaust fluid tank becomesempty.

As the fluid level nears empty, thesemessages appear every time thevehicle is started.

If the DEF low warnings are ignoredand the DEF tank becomes empty,the DIC will display messages thatdescribe the action needed anddistance until vehicle speed islimited. For the DEF warning lightsymbol, see Diesel Exhaust Fluid(DEF) Warning Light 0 12.

DEF Quality Poor

Use only DEF that is GM approved,or fluid containing the API certifiedor ISO 22241 label.

DEF has an expiration date. If thesystem detects poor quality,or contaminated or diluted DEF, aDIC message will display along withdistance until vehicle speed islimited.

The speed limitation will occur in aseries of steps with the final speedlimitation being 8 km/h (5 mph)along with a flashing warning lightand chimes.

Adding fresh DEF to the systemmay resolve the problem afterseveral kilometers/miles of driving,depending on several factors. If theDIC message persists, see yourdealer or additional DIC messagesmay display.

Service DEF System

If a problem occurs with the DEFsystem, a DIC message displaysalong with distance until vehiclespeed is limited.

The speed limitation will occur in aseries of steps with the final speedlimitation being 8 km/h (5 mph)along with a flashing warning lightand chimes.

In some cases, this message willclear itself, indicating that the DEFsystem was able to correct thecondition. If the DIC message



persists, see your dealer oradditional DIC messages maydisplay.

Service Emission System

If a problem occurs with the vehicleemission system, a DIC messagedisplays along with distance untilvehicle speed is limited. The speedlimitation will occur in a series ofsteps with the final speed limitationof 88 km/h (55 mph) and chimes. Insome cases, this message will clearitself, indicating that the emissionsystem was able to correct thecondition. If the DIC messagepersists, see your dealer oradditional DIC messages maydisplay.

Brakes

Exhaust BrakeExhaust braking is automaticallyactivated when Tow/Haul Mode isselected. It maintains the vehicle’sspeed by automaticallyimplementing a shift pattern thatuses the engine and thetransmission to slow the vehicle.The system will commanddownshifts and use the turbochargeron the engine to reduce thevehicle’s speed when the brake isapplied. The normal tow/haul shiftpattern will return once the vehicleis on a low grade or when theaccelerator pedal is pressed.

While in the Electronic RangeSelect (ERS) Mode, grade brakingis deactivated, allowing the driver toselect a range and limiting thehighest gear available. See “ManualMode” in the owner’s manual.

Fuel

Top Tier FuelGM recommends the use of TOPTIER Diesel Fuel to keep the engineclean, reduce engine deposits, andmaintain optimal vehicleperformance. Look for the TOPTIER Logo or seewww.toptiergas.com for a list of TOPTIER Diesel Fuel marketers andapplicable countries.



Fuel AdditivesTOP TIER Detergent Diesel ishighly recommended for use withyour vehicle. If your area does nothave TOP TIER Detergent Diesel,GM recommends the use ofACDelco Diesel Fuel Conditioner.This will help maintain optimalengine performance. GM does notrecommend other aftermarket dieseladditives.

If low-quality diesel is used forrefueling, GM recommends addingACDelco Fuel System TreatmentPlus-Diesel to help clean enginedeposits. This is available only atyour GM dealer.

Fuel for Diesel EnginesThe selection of a high-quality fuelis important for maintaining optimumvehicle performance. Diesel fuelshould meet or exceed the minimumrequirements in the most currentversions of the local fuel standards.

Do not use fuel with more than 15ppm sulfur.

Do not use a diesel blend containingmore than 20% biodiesel by volume.

Caution

Use of fuel that does not complywith the required technicalstandards can lead to enginepower loss, increased wear,or engine damage and may voidyour warranty.

Some improper fuels are:

. Diesel fuel with the additionof gasoline.

. Diesel fuel mixed withengine oil or automatictransmission fluid.

. Triglyceride fuels, such asraw vegetable oil or animalfat, in any form, includingwith blends of diesel orbiodiesel.

. Marine diesel fuel andfuel oils.

(Continued)

Caution (Continued)

. Diesel-water emulsions,such as Aquazole.

. Aftermarket diesel fueladditives, which containalcohols, organo-metallicadditives, or wateremulsifiers.

Caution

If the vehicle is accidentallyrefueled with gasoline, do notcontinue driving the vehicle.Driving the vehicle will damagethe fuel system. Have the vehicletowed to a qualified technician tohave the gasoline removed fromthe tank and fuel system. Refuelwith Ultra Low Sulfur Diesel fuel.It is also recommended to havethe fuel system flushed with UltraLow Sulfur Diesel, to ensure allgasoline is removed.



Some conditions, such as dirty fuel,may decrease fuel filter life and aCHANGE FUEL FILTER messagemay come on in the DriverInformation Center (DIC).

Climate Grade Diesel Fuels

At temperatures below 0 °C (32 °F),avoid using biodiesel blends above5% by volume. Using such a fuelmay cause fuel filter plugging,system gelling, and freezing, whichmay adversely impact vehiclestarting.

Severe winter grade diesel fuel,such as 1-D diesel fuel or Arcticgrade diesel fuel, can be used inextreme cold temperatures (below−18 °C or 0 °F); however, doing sowill reduce power and fuel economy.Avoid using severe winter grade fuelin warm or hot climates. It can resultin stalling, poor starting, anddamage to the fuel injection system.

Fuels improperly blended for coldtemperature operation may result inrestricted fuel filters. The vehicle isequipped with a fuel heating systemto prevent gelling or waxing of

conventional diesel fuel andbiodiesel blends, but may notprevent all cases.

In case of severe winter conditions,the fuel filter may become cloggedby wax naturally present in the fuel.To unclog it, move the vehicle to awarm garage area and allow thefilter to warm up. The fuel filter mayneed to be replaced. See Fuel FilterReplacement 0 31.

BiodieselBiodiesel is a renewable fuelproduced from vegetable oils oranimal fats that have beenchemically modified to make itcompatible with diesel fuel.

Caution

Do not use home-made biodieselor home test kits because thequality cannot be verified byapproved scientific methods. Donot use raw vegetable oil or otherunmodified bio-oils, fats,

(Continued)

Caution (Continued)

or blends of vegetable oil withdiesel. They could damage thefuel system and engine, anddamages would not be coveredby the vehicle warranty.

Biodiesel Blends

Fuels with a biodiesel content up to20% by volume may be used (e.g.,named B20). Only use biodieselblends up to 20% by volume thatcomply with your country’s orregion’s fuel standards.

Caution

Do not use blends containingmore than 20% biodiesel. Anyengine, fuel system, or exhaustafter-treatment system damagewould not be covered by thevehicle warranty.



As a renewable fuel, biodieselprovides some environmentalbenefits. However, biodiesel hasunique properties and needs to behandled differently than diesel fuel.Its use presents additional risks andmay not be appropriate in allsituations. Certain vehicle operatingmodes increase these risks andshould be avoided.

Biodiesel fuel quality degrades withtime and exposure to hightemperature quicker than Ultra LowSulfur Diesel fuel. More frequentrefueling provides the bestopportunity to have a supply of freshfuel. Storage at hot ambienttemperatures will acceleratebiodiesel degradation.

If the vehicle is not driven often anduses little fuel, or if it is stored forextended periods of time, avoid theuse of biodiesel blended fuelsabove 5% by volume. When thevehicle is stored for longer than onemonth, it should be run out ofbiodiesel to below one-quarter tank,

refueled with biodiesel-free fuel, anddriven several kilometers (miles)before storage.

Cold Weather OperationIn cold weather, the fuel filter maybecome clogged by wax naturallypresent in the fuel. To unclog it,move the vehicle to a warm garagearea and allow the filter to warm up.The fuel filter may need to bereplaced. See Fuel FilterReplacement 0 31.

At temperatures below 0 °C (32 °F),it is recommended to avoid usingbiodiesel blends above 5% blend.This blend may cause fuel filterplugging, system gelling, andfreezing that may affect vehiclestarting. You may need to turn theignition on and off a few timesbefore the vehicle will start. Also,idle the vehicle for a couple ofminutes before accelerating.

It is recommended to use Ultra LowSulfur No. 1-D diesel fuel or a blendof No. 1-D and No. 2-D diesel fuel toenhance vehicle operation in cold

weather at temperatures below 0 °C(32 °F). Use of No. 1-D diesel fuelmay lower the fuel economy. Foradditional information for better coldweather operation, see EngineHeater 0 16.

Water in FuelImproper fuel tank inspection orcleaning, or contaminated fuel fromsuppliers, can cause water to bepumped into the fuel tank along withthe diesel fuel. If a WATER IN FUELSERVICE REQUIRED messagedisplays, the water must be drainedimmediately.

{ Warning

Diesel fuel containing water is stillcombustible. You or others couldbe burned. If the fuel needs to bedrained, keep sparks, flames, andsmoking materials away from themixture.



Caution

Water in the diesel fuel cancorrode internal components ofthe fuel system and lead tosevere damage. It can alsosupport fungus or bacteriagrowth, which can damage thefuel system. Even with a dieselfuel biocide, the fuel system maystill need to be cleaned. Yourdealer can advise of theappropriate solution.

If the fuel tank needs to bepurged to remove water, see yourdealer or a qualified technician.Improper purging can damage thefuel system.

Water in Fuel Troubleshooting

If the WATER IN FUEL SERVICEREQUIRED message comes on:

ProblemRecommended

Action

Messagedisplays butgoes off duringthe ignitioncycle.

The fuel filter ispartially filledwith water. Drainthe water assoon aspossible. See"RemovingWater from theFuel Filter"following.

ProblemRecommended

Action

Messagedisplays andstays on.

Drain the fuelfilterimmediately.If no water canbe drained, andthe temperatureis belowfreezing, thenwater may befrozen in thefilter. Move thevehicle to awarm location tothaw the water,then drain thefuel. If water stilldoes not drain,see your dealer.



ProblemRecommended

Action

Immediatelyafter refueling,messagedisplays andstays on.

A large amountof water is in thefuel tank. Drainthe fuel filterimmediately.If the messagestays on orcomes back onwithoutrefueling, thenfuel tank purgingis required. Seeyour dealer.If the messagedisplays and theengine stalls orruns rough, donot drive untilthe watercontaminatedfuel is drained.

Caution

Driving with this message on candamage the fuel injection systemand the engine. If the messagecomes on right after a refuel,water was pumped into the fueltank. Turn off the engine anddrain the water immediately.

Removing Water from the FuelFilter

To drain water:

1. Turn the engine off and applythe parking brake.

2. Place a container under thefilter drain valve. The filter drainvalve is on the bottom of thefuel filter. The filter drain valveis under the vehicle on thedriver side, inside theframe rail.

3. Open the drain valve by turningit counterclockwise. Allow thefilter to drain until all of thewater has been removed.Close the valve.

4. Properly dispose of the watercontaminated fuel.



5. Start the engine and let it runfor a few minutes. During thedraining process, air may haveentered the fuel system. If theengine stalls, the fuel systemmay need to be primed. See“Fuel Priming” following.

Fuel Priming

For the fuel system to work properly,the fuel lines must be full of fuel.If air gets in, the fuel lines need tobe primed before operating thevehicle.

If air is present, the following mayhave happened:

. The vehicle ran out of fuel.

. The fuel filter was removed.

. The fuel lines were removed ordisconnected.

. The fuel filter water drain valvewas opened while the enginewas running.

Priming the Fuel System

There is an electric priming pumpthat will bring fuel to the engine andeliminate air in the fuel lines. Toprime the engine:

1. Correct any condition thatcaused the loss of prime.

2. Turn the ignition on for30 seconds. Do not start theengine. The fuel pump will startpriming.

3. Turn the ignition off, then backon, and crank the engine for15 seconds.

4. If the engine does not start,repeat Steps 2 and 3 until theengine starts.

If the engine does not startafter repeating Steps 2 and 3three times, turn the ignition offfor 60 seconds.

5. Repeat the above steps untilthe engine starts.

6. If the engine starts, but doesnot run smoothly, increase theengine speed slightly.

7. If the engine starts and runsbut stalls again, turn theignition off for 60 seconds.

8. When the engine starts, let itidle for a few minutes andcheck the filter for any leaks.

Running Out of Fuel

{ Warning

Diesel fuel is combustible. It couldstart a fire if it gets on hot engineparts. You could be burned. Catchany fuel from the air bleed valve,and wipe up any spilled fuel witha cloth.

If the engine has stalled due torunning out of fuel, try the followingsteps to restart it:

1. If parked on a level surface,add at least 7.6 L (2 gal) offuel. Up to 18.9 L (5 gal) maybe needed if parked on aslope.



2. Follow the fuel primingprocedure earlier in this sectionto prime the fuel filter.

3. Turn the ignition to START for10 to 15 seconds at a time untilthe engine starts. If the enginetries to run, but does not runsmoothly, increase the rpmslightly by using the acceleratorpedal. This will help force airthrough the system.

4. Return to Step 2 if the enginestalls and will not restart.

5. After a few attempts, if theengine still does not start, seeyour dealer.

Fuel Filter Replacement

{ Warning

Diesel fuel is flammable. It couldstart a fire if something ignites it,and people could be burned. Donot let it get on hot engine parts,and keep matches or otherignition sources away.

The fuel filter is on the driver side,inside the frame rail.

To replace the fuel filter:

1. Drain any water from the filter.See “Removing Water from theFuel Filter” in Water in Fuel0 27.

Keep the engine off until theprocedure is completed.

2. Apply the parking brake.

3. Remove the filter element capby turning it counterclockwise.

4. Remove the filter element.If there is any dirt on the filtersealing surface, clean it off.

5. Install the new filter elementand o-ring.

6. Reinstall and tighten the filtercap to the housing.

7. Use the fuel filter primingprocedure to prime the fuelfilter. See “Fuel Priming” inWater in Fuel 0 27.

8. Start the engine and let it idlefor five minutes. Check the fuelfilter and air bleed valve forleaks.

9. Reset the fuel filter monitor.See Driver Information Center(DIC) 0 12.

Filling the TankAn arrow on the fuel gaugeindicates which side of the vehiclethe fuel door is on. See “FuelGauge” in the Owner’s Manual. Donot refill the diesel fuel and DieselExhaust Fluid (DEF) at thesame time.



{ Warning

Fuel vapors and fuel fires burnviolently and can cause injury ordeath.

Follow these guidelines to helpavoid injuries to you and others:

. Read and follow all theinstructions on the fuelpump island.

. Turn off the engine whenrefueling.

. Keep sparks, flames, andsmoking materials awayfrom fuel.

. Do not leave the fuel pumpunattended.

. Avoid using electronicdevices while refueling.

. Do not re-enter the vehiclewhile pumping fuel.

. Keep children away fromthe fuel pump and never letchildren pump fuel.

(Continued)

Warning (Continued)

. Before touching the fillnozzle, touch a metallicobject to discharge staticelectricity from your body.

. Fuel can spray out if the fillnozzle is inserted tooquickly. This spray canhappen if the tank is nearlyfull, and is more likely in hotweather. Insert the fill nozzleslowly and wait for any hissnoise to stop beforebeginning to flow fuel.

To open the fuel door, push andrelease the rearward center edge ofthe door. The capless refuelingsystem does not have a fuel cap.Fully insert and latch the fill nozzle,then begin fueling.

{ Warning

Overfilling the fuel tank by morethan three clicks of a standard fillnozzle may cause:

. Vehicle performance issues,including engine stalling anddamage to the fuel system.

(Continued)



Warning (Continued)

. Fuel spills.

. Under certain conditions,fuel fires.

Diesel fuel can foam when filling thetank. The automatic pump nozzlemay shut off, even if the tank is notfull. Wait for the foaming to stop,and then fill the tank more slowly.Be careful not to spill fuel. Waitfive seconds after pumping beforeremoving the fill nozzle. Clean fuelfrom painted surfaces as soon aspossible. See “Exterior Care” underVehicle Care in the Owner’sManual. Push the fuel door closed.

{ Warning

If a fire starts while you arerefueling, do not remove the fillnozzle. Shut off the flow of fuel byshutting off the pump or bynotifying the station attendant.Leave the area immediately.

Accidental Refueling withGasoline

Caution

If the vehicle is accidentallyrefueled with gasoline, do notcontinue driving the vehicleexcept to get to a location whereit can be stopped safely. Drivingthe vehicle will damage theengine. Tow the vehicle forservice. Have the gasolineremoved from the tank and fuelsystem.

Filling the Tank with a PortableGas Can

If the vehicle runs out of fuel andmust be filled from a portablegas can:

1. Locate the capless funneladapter.

2. Insert and latch the funnel intothe capless fuel system.

{ Warning

Attempting to refuel from aportable fuel container withoutusing the funnel adapter maycause fuel spillage and damagethe capless fuel system. Thiscould cause a fire. You or otherscould be badly burned and thevehicle could be damaged.

3. Remove and clean the funneladapter and return it to thestorage location.



Filling a Portable FuelContainer

{ Warning

Filling a portable fuel containerwhile it is in the vehicle can causefuel vapors that can ignite eitherby static electricity or othermeans. You or others could bebadly burned and the vehiclecould be damaged. Always:

. Use approved fuelcontainers.

. Remove the container fromthe vehicle, trunk, or pickupbed before filling.

. Place the container on theground.

(Continued)

Warning (Continued)

. Place the nozzle inside thefill opening of the containerbefore dispensing fuel, andkeep it in contact with the fillopening until filling iscomplete.

. Fill the container no morethan 95% full to allow forexpansion.

. Do not smoke, lightmatches, or use lighterswhile pumping fuel.

. Do not use electronicdevices while pumping fuel.

Trailer TowingWhen towing at high elevation onsteep uphill grades, consider thefollowing:

Engine coolant at higher elevationwill boil at a lower temperature thanat or near sea level. If the engine isturned off immediately after towingat high elevation on steep uphillgrades, the vehicle may show signssimilar to engine overheating. Toavoid this, let the engine run whileparked (preferably on level ground)with the transmission in P (Park)and the parking brake applied for atleast five minutes before turning theengine off. If the overheat warningcomes on, see Engine Overheating0 48.


Vehicle Care 35

Vehicle Care

General InformationAccessories and

Modifications . . . . . . . . . . . . . . . . . 35

Vehicle ChecksEngine Compartment

Overview . . . . . . . . . . . . . . . . . . . . . 37Engine Oil . . . . . . . . . . . . . . . . . . . . . 38Engine Oil Life System . . . . . . . . 40Automatic Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . . . . 40Engine Air Filter Life System . . . 41Engine Air Cleaner/Filter . . . . . . . 41Cooling System (Engine) . . . . . . 42Cooling System

(Turbocharger) . . . . . . . . . . . . . . . 46Engine Overheating . . . . . . . . . . . . 48Engine Fan . . . . . . . . . . . . . . . . . . . . 49

Electrical SystemEngine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . . 49

Jump StartingJump Starting - North

America . . . . . . . . . . . . . . . . . . . . . . 51

General Information

Accessories andModificationsAdding non-dealer accessories ormaking modifications to the vehiclecan affect vehicle performance andsafety, including such things asairbags, braking, stability, ride andhandling, emissions systems,aerodynamics, durability, andelectronic systems like antilockbrakes, traction control, and stabilitycontrol. These accessories ormodifications could even causemalfunction or damage not coveredby the vehicle warranty.

Damage to vehicle componentsresulting from modifications or theinstallation or use of non-GMcertified parts, including controlmodule or software modifications, isnot covered under the terms of thevehicle warranty and may affectremaining warranty coverage foraffected parts.

GM Accessories are designed tocomplement and function with othersystems on the vehicle. See yourdealer to accessorize the vehicleusing genuine GM Accessoriesinstalled by a dealer technician.

See the warranty manual.


36 Vehicle Care

Aftermarket EnginePerformance EnhancementProducts and Modifications

Some aftermarket engineperformance products andmodifications promise a way toincrease the horsepower and torquelevels of the vehicle's powertrain.You should be aware that theseproducts could have harmful effectson the performance and life of theengine, exhaust emission system,transmission, and drivetrain. Theengine, transmission, and drivetrainhave been designed and built tooffer industry leading durability andperformance in the most demandingapplications. Engine powerenhancement products may enablethe engine to operate at horsepower

and torque levels that coulddamage, create failure, or reducethe life of the engine, engineemission system, transmission, anddrivetrain. Damage, failure,or reduced life of the engine,transmission, emission system,drivetrain, or other vehiclecomponents caused by aftermarketengine performance enhancementproducts or modifications might notbe covered under the vehiclewarranty.


Vehicle Care 37

Vehicle Checks

Engine Compartment Overview


38 Vehicle Care

1. Remote Negative (-) GroundTerminal

2. Positive (+) Terminal

3. Battery

4. Engine Compartment FuseBlock

5. Engine Oil Fill Cap

6. Engine Fan (Out of View)

7. Engine Oil Dipstick

8. Engine Coolant Surge Tankand Pressure Cap

9. Charge Air Coolant Surge Tankand Pressure Cap

10. Engine Air Cleaner/Filter

11. Brake Fluid Reservoir

12. Auxiliary Fuse Block

13. Windshield Washer FluidReservoir

Engine OilTo ensure proper engineperformance and long life, carefulattention must be paid to engine oil.

Following these simple, butimportant steps will help protectyour investment:

. Use engine oil approved to theproper specification and of theproper viscosity grade. See“Selecting the Right Engine Oil”in this section.

. Check the engine oil levelregularly and maintain theproper oil level. See “CheckingEngine Oil” and “When to AddEngine Oil” in this section.

. Change the engine oil at theappropriate time. See “EngineOil Life System” in the owner’smanual.

. Always dispose of engine oilproperly. See “What to Do withUsed Oil” in this section.

Checking Engine Oil

Check the engine oil level regularly,every 650 km (400 mi), especiallyprior to a long trip. The engine oildipstick handle is a loop. SeeEngine Compartment Overview 0 37for the location.

{ Warning

The engine oil dipstick handlemay be hot; it could burn you.Use a towel or glove to touch thedipstick handle.

If a low oil Driver Information Center(DIC) message displays, check theoil level.

Follow these guidelines:

. To get an accurate reading, parkthe vehicle on level ground.Check the engine oil level afterthe engine has been off for atleast two hours. Checking theengine oil level on steep gradesor too soon after engine shutoffcan result in incorrect readings.Accuracy improves whenchecking a cold engine prior tostarting. Remove the dipstickand check the level.

. If unable to wait two hours, theengine must be off for at least15 minutes if the engine iswarm, or at least 30 minutes if


Vehicle Care 39

the engine is not warm. Pull outthe dipstick, wipe it with a cleanpaper towel or cloth, then push itback in all the way. Remove itagain, keeping the tip down, andcheck the level.

When to Add Engine Oil

If the oil is below the cross-hatchedarea at the tip of the dipstick andthe engine has been off for at least15 minutes, add 1 L (1 qt) of therecommended oil and then recheckthe level. See “Selecting the RightEngine Oil” later in this section foran explanation of what kind of oil touse. For engine oil crankcasecapacity, see Capacities andSpecifications 0 65.

Caution

Do not add too much oil. Oillevels above or below theacceptable operating rangeshown on the dipstick are harmfulto the engine. If the oil level isabove the operating range (i.e.,the engine has so much oil thatthe oil level gets above thecross-hatched area that showsthe proper operating range), theengine could be damaged. Drainthe excess oil or limit driving ofthe vehicle, and seek a serviceprofessional to remove theexcess oil.

See Engine Compartment Overview0 37 for the location of the engineoil fill cap.

Be sure to add enough oil to put thelevel somewhere in the properoperating range. Push the dipstickall the way back in when through.

Selecting the Right Engine Oil

Selecting the right engine oildepends on both the proper oilspecification and viscosity grade.See Recommended Fluids andLubricants 0 61.

Specification

Use engine oils that meet thedexosD specification. Engine oilsthat have been approved by GM asmeeting the dexosD specificationare marked with the dexosDapproved logo. Seewww.gmdexos.com.

Caution

Failure to use the recommendedengine oil or equivalent can resultin engine damage not covered bythe vehicle warranty.


40 Vehicle Care

Viscosity Grade

Use SAE 0W-20 viscosity gradeengine oil.

When selecting an oil of theappropriate viscosity grade, it isrecommended to select an oil of thecorrect specification. See“Specification” earlier in this section.

Engine Oil Additives/EngineOil Flushes

Do not add anything to the oil. Therecommended oils meeting thedexos specification are all that isneeded for good performance andengine protection.

Engine oil system flushes are notrecommended and could causeengine damage not covered by thevehicle warranty.

What to Do with Used Oil

Used engine oil contains certainelements that can be unhealthy foryour skin and could even causecancer. Do not let used oil stay onyour skin for very long. Clean yourskin and nails with soap and water,

or a good hand cleaner. Wash orproperly dispose of clothing or ragscontaining used engine oil. See themanufacturer's warnings about theuse and disposal of oil products.

Used oil can be a threat to theenvironment. If you change yourown oil, be sure to drain all the oilfrom the filter before disposal. Neverdispose of oil by putting it in thetrash or pouring it on the ground,into sewers, or into streams orbodies of water. Recycle it by takingit to a place that collects used oil.

Engine Oil Life SystemThe engine oil life system calculatesengine oil life based on vehicle useand displays the CHANGE ENGINEOIL SOON message when it is timeto change the engine oil and filter.The oil life system should be resetto 100% only following an oilchange. See “Engine Oil LifeSystem” in the owner’s manual.

Automatic TransmissionFluid

When to Check and Change

It is not necessary to check thetransmission fluid level.A transmission fluid leak is the onlyreason for fluid loss. If a leakoccurs, take the vehicle to yourdealer and have it repaired as soonas possible.

There is a special procedure forchecking and changing thetransmission fluid. Because thisprocedure is difficult, this should bedone at your dealer. Contact yourdealer for additional information.

Caution

Use of the incorrect automatictransmission fluid may damagethe vehicle, and the damage maynot be covered by the vehiclewarranty. Always use the correctautomatic transmission fluid. SeeRecommended Fluids andLubricants 0 61.


Vehicle Care 41

Change the fluid and filter at theintervals listed in MaintenanceSchedule 0 56, and be sure to usethe fluid listed in RecommendedFluids and Lubricants 0 61.

Engine Air Filter LifeSystemIf equipped, this feature providesthe engine air filter's remaining lifeand best timing for a change. Thetiming to change an engine air filterdepends on driving andenvironmental conditions.

When to Change the EngineAir Filter

When the Driver Information Center(DIC) displays a message to replacethe engine air filter at the next oilchange, follow this timing.

When the DIC displays a messageto replace the engine air filter soon,replace the engine air filter at theearliest convenience.

The system must be reset after theengine air filter is changed.

If the DIC displays a message tocheck the engine air filter system,see your dealer.

How to Reset the Engine AirFilter Life System

To reset:

1. Place the vehicle in P (Park).

2. Display the Air Filter Life on theDIC. See Driver InformationCenter (DIC) 0 12.

3. Press T on the steering wheel,or press the trip odometer resetstem if the vehicle does nothave DIC controls, to move tothe Reset/Disable display area.Select Reset, then press thethumbwheel or press the resetstem for several seconds.

4. Press the thumbwheel or thereset stem to confirm the reset.

Engine Air Cleaner/FilterThe engine air cleaner/filter islocated in the engine compartmenton the driver side of the vehicle.

See Engine Compartment Overview0 37 for more information onlocation.

When to Inspect the Engine AirCleaner/Filter

If the vehicle is not equipped withthe engine air filter life system, seeMaintenance Schedule 0 56 forintervals on inspecting andreplacing the engine air cleaner/filter.

How to Inspect/Replace theEngine Air Cleaner/Filter

Do not start the engine or have theengine running with the engine aircleaner/filter housing open. Beforeremoving the engine air cleaner/filter, make sure that the engine aircleaner/filter housing and nearbycomponents are free of dirt anddebris. Remove the engine aircleaner/filter. Lightly tap and shakethe engine air cleaner/filter (awayfrom the vehicle), to release loosedust and dirt. Inspect the engine aircleaner/filter for damage, andreplace if damaged. Do not clean


42 Vehicle Care

the engine air cleaner/filter orcomponents with water orcompressed air.

To inspect or replace the air cleaner/filter:

1. Remove the three screws, tiltthe cover, and slide it out of theassembly.

2. Inspect or replace the engineair cleaner/filter.

3. Lower the cover, slide it intothe assembly, then secure withthe three screws.

4. If equipped, reset the engineair filter life system afterreplacing the engine air filter.See Engine Air Filter LifeSystem 0 41.

{ Warning

Operating the engine with the aircleaner/filter off can cause you orothers to be burned. Use cautionwhen working on the engine. Donot start the engine or drive thevehicle with the air cleaner/filteroff, as flames may be present ifthe engine backfires.

Caution

If the air cleaner/filter is off, dirtcan easily get into the engine,which could damage it. Alwayshave the air cleaner/filter in placewhen driving.

Cooling System (Engine)The cooling system allows theengine to maintain the correctworking temperature.

1. Engine Cooling Fan (Outof View)


3. Charge Air Coolant SurgeTank and Pressure Cap


Vehicle Care 43

{ Warning

An underhood electric fan canstart up even when the engine isnot running and can cause injury.Keep hands, clothing, and toolsaway from any underhoodelectric fan.

{ Warning

Do not touch heater or radiatorhoses, or other engine parts.They can be very hot and canburn you. Do not run the engine ifthere is a leak; all coolant couldleak out. That could cause anengine fire and can burn you. Fixany leak before driving thevehicle.

Engine Coolant

The cooling system in the vehicle isfilled with DEX-COOL enginecoolant mixture. See RecommendedFluids and Lubricants 0 61 andMaintenance Schedule 0 56.

The following explains the coolingsystem and how to add coolantwhen it is low. If there is a problemwith engine overheating, see EngineOverheating 0 48.

A 50/50 mixture of clean, drinkablewater and DEX-COOL coolant will:

. Give freezing protection down to−37 °C (−34 °F).

. Give boiling protection up to129 °C (265 °F).

. Protect against rust andcorrosion.

. Help keep the proper enginetemperature.

. Let the warning lights andgauges work as they should.

What to Use

{ Warning

Plain water, or other liquids suchas alcohol, can boil before theproper coolant mixture will. Withplain water or the wrong mixture,the engine could get too hot butthere would not be an overheatwarning. The engine could catchfire and you or others could beburned.

Use a 50/50 mixture of clean,drinkable water and DEX-COOLcoolant which will not damagealuminum parts. If using thismixture, nothing else needs to beadded.

If coolant has to be added morethan four times a year, have yourdealer check the vehicle coolingsystem.


44 Vehicle Care

Caution

Do not use anything other than amix of DEX-COOL coolant thatmeets GM StandardGMW3420 and clean, drinkablewater. Anything else can causedamage to the engine coolingsystem and the vehicle, whichwould not be covered by thevehicle warranty.

Never dispose of engine coolant byputting it in the trash, or by pouringit on the ground or into sewers,streams, or bodies of water. Havethe coolant changed by anauthorized service center, familiarwith legal requirements regardingused coolant disposal. This will helpprotect the environment and yourhealth.

Checking Coolant

The coolant surge tank is in theengine compartment on the driverside of the vehicle. See EngineCompartment Overview 0 37 forlocation.

The vehicle must be on a levelsurface. When the engine is cold,the coolant level should be at theindicated mark.

Adding Coolant

Caution

If coolant is changed or added,always add enough to fill thesystem completely or enginedamage may occur.

If more coolant is needed, add theproper DEX-COOL coolant mixtureat the surge tank, but be careful notto spill it.

{ Warning

Spilling coolant on hot engineparts can burn you. Coolantcontains ethylene glycol and it willburn if the engine parts are hotenough.


Vehicle Care 45

{ Warning

Steam and scalding liquids from ahot cooling system are underpressure. Turning the pressurecap, even a little, can cause themto come out at high speed andyou could be burned. Never turnthe cap when the cooling system,including the pressure cap, is hot.Wait for the cooling system andpressure cap to cool.

If no coolant is visible in the surgetank, add coolant as follows:

1. Remove the coolant surge tankpressure cap when the coolingsystem, including the coolantsurge tank pressure cap andupper radiator hose, is nolonger hot.

Turn the pressure cap slowlyclockwise about one-half turn.If a hiss is heard, wait for thatto stop. A hiss means there isstill some pressure left.

2. Keep turning the pressure capslowly, and remove it.

3. Slowly fill the coolant surgetank. Do not let the coolantlevel go above the indicatedmark in the tank until after theengine comes to the operatingtemperature in Step 4.

4. With the coolant surge tankpressure cap off, start theengine and let it run until theengine coolant temperaturegauge indicates approximately90 °C (195 °F).

By this time, the coolant levelinside the coolant surge tankmay be lower. If the level islower, slowly add more of theproper mixture to the coolantsurge tank until it reaches theindicated mark.

5. Replace the pressure cap andbe sure it is locked.

6. Verify coolant level after theengine is shut off and thecoolant is cold. If necessary,repeat Steps 1–6.

If the coolant level is still low afterhaving followed these steps twice,have the coolant system checked bya certified technician at the dealerfor a possible leak.

Caution

If the pressure cap is not tightlyinstalled, coolant loss and enginedamage may occur. Be sure thecap is properly and tightlysecured.

Automatic Coolant Fill and AirRemoval

If equipped, this feature assists infilling and removing air from thecooling system after service ofcomponents or when coolant isadded after being too low.


46 Vehicle Care

To activate the fill and air removalprocess:

1. With a cold system, addcoolant to the indicated markon the surge tank.

2. Turn the ignition on.

3. Turn off the air conditioning.

4. Set the parking brake.

5. At the same time, press theaccelerator and the brake fortwo seconds, then release.

6. Start the vehicle within five to10 seconds.

7. Idle the engine forthree minutes while addingfluid as the level drops belowthe indicated mark on thesurge tank.

8. Replace the cap and run theengine at 2500 rpm for10 minutes while watching thecoolant temperature gauge tobe sure the temperature hasrisen but is not overheating.If the temperature has not risenor is overheating, return to idle

and shut off the engine. Allowthe engine to completely cooldown and add coolant.

9. Allow the system to completelycool down and check the levelof coolant in the surge tank. If itis low, add fluid to the indicatedmark and repeat Steps 3–9.

Cooling System(Turbocharger)The cooling system allows theCharge Air Cooling System tomaintain the correct workingtemperature.

1. Engine Cooling Fan (Outof View)


3. Charge Air Coolant SurgeTank and Pressure Cap

{ Warning

An underhood electric fan canstart up even when the engine isnot running and can cause injury.Keep hands, clothing, and toolsaway from any underhoodelectric fan.

{ Warning

Do not touch heater or radiatorhoses, or other engine parts.They can be very hot and canburn you. Do not run the engine ifthere is a leak; all coolant couldleak out. That could cause anengine fire and can burn you. Fixany leak before driving thevehicle.


Vehicle Care 47

Charge Air Coolant

The charge air cooling system in thevehicle is filled with DEX-COOLengine coolant mixture. SeeRecommended Fluids andLubricants 0 61 andMaintenance Schedule 0 56.

The following explains the coolingsystem and how to add coolantwhen it is low. If there is a problemwith engine overheating, see EngineOverheating 0 48.

A 50/50 mixture of clean, drinkablewater and DEX-COOL coolant will:

. Give freezing protection down to−37 °C (−34 °F).

. Give boiling protection up to129 °C (265 °F).

. Protect against rust andcorrosion.

. Help keep the proper enginetemperature.

. Let the warning lights andgauges work as they should.

What to Use

{ Warning

Plain water, or other liquids suchas alcohol, can boil before theproper coolant mixture will. Withplain water or the wrong mixture,the engine could get too hot butthere would not be an overheatwarning. The engine could catchfire and you or others could beburned.

Use a 50/50 mixture of clean,drinkable water and DEX-COOLcoolant which will not damagealuminum parts. If using thismixture, nothing else needs to beadded.

If coolant has to be added morethan four times a year, have yourdealer check the vehicle charge aircooling system.

Caution

Do not use anything other than amix of DEX-COOL coolant thatmeets GM StandardGMW3420 and clean, drinkablewater. Anything else can causedamage to the engine coolingsystem and the vehicle, whichwould not be covered by thevehicle warranty.

Never dispose of engine coolant byputting it in the trash, or by pouringit on the ground or into sewers,streams, or bodies of water. Havethe coolant changed by anauthorized service center, familiarwith legal requirements regardingused coolant disposal. This will helpprotect the environment and yourhealth.


48 Vehicle Care

Checking Coolant

The charge air coolant surge tank isin the engine compartment on thedriver side of the vehicle. SeeEngine Compartment Overview 0 37for location.

The vehicle must be on a levelsurface. When the engine is cold,the coolant level should be at theindicated mark.

Adding Coolant

If the coolant level in the charge aircoolant surge tank is low, return thevehicle to your dealer to be checkedfor leaks, purged of air and coolantlevel adjustment.

Engine OverheatingThere is an engine coolanttemperature gauge on theinstrument cluster. See the owner’smanual.

If Steam Is Coming from theEngine Compartment

{ Warning

Steam and scalding liquids from ahot cooling system are underpressure. Turning the pressurecap, even a little, can cause themto come out at high speed andyou could be burned. Never turnthe cap when the cooling system,including the pressure cap, is hot.Wait for the cooling system andpressure cap to cool.

Caution

Do not run the engine if there is aleak in the engine cooling system.This can cause a loss of allcoolant and can damage thesystem and vehicle. Have anyleaks fixed right away.

If No Steam Is Coming fromthe Engine Compartment

A Driver Information Center (DIC)message, along with a low coolantcondition, can indicate a seriousproblem.

If there is an engine overheatwarning and the vehicle does nothave a low coolant condition, andno steam is heard or seen, theproblem may not be too serious.Sometimes the engine can get alittle too hot when the vehicle:

. Climbs a long hill on a hot day.

. Stops after high-speed driving.

. Idles for long periods in traffic.


Vehicle Care 49. Tows a trailer. See “Driving on

Grades” under “DrivingCharacteristics and Towing Tips”in the owner’s manual.

If the DIC message comes on withno sign of steam, try this for aminute or so:

1. In heavy traffic, let the engineidle in N (Neutral) whilestopped. If it is safe to do so,pull off the road, shift toP (Park) or N (Neutral), and letthe engine idle.

2. Turn on the heater to full hot atthe highest fan speed andopen the window as necessary.

If the vehicle no longer has theoverheat warning, the vehicle canbe driven. Just to be safe, driveslower for about 10 minutes. If thewarning does not come back on,drive normally and have the coolingsystem checked for proper fill andfunction.

If the warning continues, pull over,stop, and park the vehicleright away.

Engine FanThe vehicle has electric coolingfan(s). The fans may be heardspinning at low speed during mosteveryday driving. The fans may turnoff if no cooling is required. Underheavy vehicle loading, trailer towing,high outside temperatures,or operation of the air conditioningsystem, the fans may change tohigh speed and an increase in fannoise may be heard. This is normaland indicates that the coolingsystem is functioning properly. Thefans will change to low speed whenadditional cooling is no longerrequired.

The electric engine cooling fansmay run after the engine has beenturned off. This is normal and noservice is required.

Electrical System

Engine CompartmentFuse BlockThe engine compartment fuse blockis in the engine compartment, onthe passenger side of the vehicle.

Lift the cover to access the fuseblock.


50 Vehicle Care

Caution

Spilling liquid on any electricalcomponent on the vehicle maydamage it. Always keep thecovers on any electricalcomponent.

A fuse puller is available in the leftinstrument panel End Cap.

The vehicle may not be equippedwith all of the fuses, relays, andfeatures shown.

Auxiliary Fuse Block

Fuses Usage

7 Powertrainsensor (LD)

8 —

9 Diesel exhaust fluidcontrol

10 Fuel heater

11 Smart sensors

12 SCRPM

13 100 wattpump (LD)

Relays Usage

1 Diesel exhaust fluidcontrol

2 Fuel heater

3 100 wattpump (LD)

4 Powertrainsensor (LD)

5 Cooling fanclutch (HD)

6 Powertrainsensor (HD)


Vehicle Care 51

Jump Starting

Jump Starting - NorthAmericaIf the battery has run down, try touse another vehicle and somejumper cables to start your vehicle.Be sure to use the following steps todo it safely.

{ Warning

WARNING: Battery posts,terminals, and relatedaccessories contain lead and leadcompounds, chemicals known tothe State of California to causecancer and birth defects or otherreproductive harm. Batteries alsocontain other chemicals known tothe State of California to causecancer. WASH HANDS AFTERHANDLING. For more informationgo to www.P65Warnings.ca.gov/passenger-vehicle.

See “California Proposition65 Warning” in the owner’s manual.

{ Warning

Batteries can hurt you. They canbe dangerous because:

. They contain acid that canburn you.

. They contain gas that canexplode or ignite.

. They contain enoughelectricity to burn you.

If you do not follow these stepsexactly, some or all of thesethings can hurt you.

Caution

Ignoring these steps could resultin costly damage to the vehiclethat would not be covered by thevehicle warranty. Trying to startthe vehicle by pushing or pulling itwill not work, and it could damagethe vehicle.

1. Good Battery PositiveTerminal

2. Good Battery NegativeTerminal

3. Discharged Battery RemoteNegative GroundingTerminal

4. Discharged Battery PositiveTerminal

The jump start positive terminal onthe discharged battery (4) is locatedin the engine compartment on thepassenger side of the vehicle.

The jump start remote negativegrounding (3) for the dischargedbattery is to the left of the battery.


52 Vehicle Care

The jump start positive terminal (1)and negative terminal (2) are on thebattery of the vehicle providing thejump start.

The positive jump start connectionfor the discharged battery is under atrim cover. Open the cover toexpose the terminal.

1. Check the other vehicle.It must have a 12-volt batterywith a negative ground system.

Caution

If the other vehicle does not havea 12-volt system with a negativeground, both vehicles can bedamaged. Only use a vehicle thathas a 12-volt system with anegative ground for jump starting.

2. Position the two vehicles sothat they are not touching.

3. Set the parking brake firmlyand put the shift lever inP (Park) with an automatictransmission, or N (Neutral)with a manual transmission.

Caution

If any accessories are left on orplugged in during the jumpstarting procedure, they could bedamaged. The repairs would notbe covered by the vehiclewarranty. Whenever possible, turnoff or unplug all accessories oneither vehicle when jump starting.

4. Turn the ignition off. Turn off alllights and accessories in bothvehicles, except the hazardwarning flashers if needed.

{ Warning

An electric fan can start up evenwhen the engine is not runningand can injure you. Keep hands,clothing, and tools away from anyunderhood electric fan.

{ Warning

Using a match near a battery cancause battery gas to explode.People have been hurt doing this,and some have been blinded.Use a flashlight if you need morelight.

Battery fluid contains acid thatcan burn you. Do not get it onyou. If you accidentally get it inyour eyes or on your skin, flushthe place with water and getmedical help immediately.

{ Warning

Fans or other moving engineparts can injure you badly. Keepyour hands away from movingparts once the engine is running.

5. Connect one end of the redpositive (+) cable to thepositive (+) terminal on thedischarged battery.


Vehicle Care 53

6. Connect the other end of thered positive (+) cable to thepositive (+) terminal of the goodbattery.

7. Connect one end of the blacknegative (–) cable to thenegative (–) terminal of thegood battery.

8. Connect the other end of theblack negative (–) cable to theremote negative (–) groundingterminal for the dischargedbattery.

9. Start the engine in the vehiclewith the good battery and runthe engine at idle speed for atleast four minutes.

10. Try to start the vehicle that hadthe dead battery. If it will notstart after a few tries, itprobably needs service.

Caution

If the jumper cables areconnected or removed in thewrong order, electrical shortingmay occur and damage thevehicle. The repairs would not becovered by the vehicle warranty.Always connect and remove thejumper cables in the correct order,making sure that the cables donot touch each other or othermetal.

Jumper Cable Removal

Reverse the sequence exactly whenremoving the jumper cables.

After starting the disabled vehicleand removing the jumper cables,allow it to idle for several minutes.


54 Service and Maintenance

Service andMaintenance

General InformationGeneral Information . . . . . . . . . . . . 54

Maintenance ScheduleMaintenance Schedule . . . . . . . . 56

Recommended Fluids,Lubricants, and Parts

Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . 61

Maintenance ReplacementParts . . . . . . . . . . . . . . . . . . . . . . . . . 62

Maintenance RecordsMaintenance Records . . . . . . . . . 63

General InformationThis maintenance section applies tovehicles with a diesel engine. Forgasoline engine vehicles, see themaintenance schedule section inthe owner’s manual.

Your vehicle is an importantinvestment. This section describesthe required maintenance for thevehicle. Follow this schedule to helpprotect against major repairexpenses resulting from neglect orinadequate maintenance. It mayalso help to maintain the value ofthe vehicle if it is sold. It is theresponsibility of the owner to haveall required maintenance performed.

Your dealer has trained technicianswho can perform requiredmaintenance using genuinereplacement parts. They haveup-to-date tools and equipment forfast and accurate diagnostics. Manydealers have extended evening andSaturday hours, courtesytransportation, and onlinescheduling to assist with serviceneeds.

Your dealer recognizes theimportance of providingcompetitively priced maintenanceand repair services. With trainedtechnicians, your dealer is the placefor routine maintenance such as oilchanges and tire rotations andadditional maintenance items liketires, brakes, batteries, and wiperblades.

Caution

Damage caused by impropermaintenance can lead to costlyrepairs and may not be coveredby the vehicle warranty.Maintenance intervals, checks,inspections, recommended fluids,and lubricants are important tokeep the vehicle in good workingcondition.

Do not have chemical flushes thatare not approved by GMperformed on the vehicle. Theuse of flushes, solvents, cleaners,or lubricants that are not

(Continued)


Service and Maintenance 55

Caution (Continued)

approved by GM could damagethe vehicle, requiring expensiverepairs that are not covered bythe vehicle warranty.

The Tire Rotation and RequiredServices are the responsibility of thevehicle owner. It is recommended tohave your dealer perform theseservices every 12 000 km/7,500 mi.Proper vehicle maintenance helps tokeep the vehicle in good workingcondition, improves fuel economy,and reduces vehicle emissions.

Because of the way people usevehicles, maintenance needs vary.There may need to be morefrequent checks and services. TheAdditional Required Services -Normal are for vehicles that:

. Carry passengers and cargowithin recommended limits onthe Tire and Loading Informationlabel. See “Vehicle Load Limits”in the owner’s manual.

. Are driven on reasonable roadsurfaces within legal drivinglimits.

. Use the recommended fuel. SeeFuel for Diesel Engines 0 25.

Refer to the information in theMaintenance Schedule AdditionalRequired Services - Normal chart.

The Additional Required Services -Severe are for vehicles that are:

. Mainly driven in heavy city trafficin hot weather.

. Mainly driven in hilly ormountainous terrain.

. Frequently towing a trailer.

. Used for high speed orcompetitive driving.

. Used for taxi, police, or deliveryservice.

Refer to the information in theMaintenance Schedule AdditionalRequired Services - Severe chart.

{ Warning

Performing maintenance work canbe dangerous and can causeserious injury. Performmaintenance work only if therequired information, proper tools,and equipment are available.If they are not, see your dealer tohave a trained technician do thework. See “Doing Your OwnService Work” in the owner’smanual.



MaintenanceScheduleOwner Checks and Services

See the owner’s manual for otherservices and intervals that may berequired.

At Each Fuel Stop

. Check the engine oil level. SeeEngine Oil 0 38.

Engine Oil Change

When the CHANGE ENGINE OILSOON message displays, have theengine oil and filter changed withinthe next 1 000 km/600 mi. If drivenunder the best conditions, theengine oil life system may notindicate the need for vehicle servicefor up to a year. The engine oil andfilter must be changed at least once

a year and the oil life system mustbe reset. Your trained dealertechnician can perform this work.If the engine oil life system is resetaccidentally, service the vehiclewithin 5 000 km/3,000 mi since thelast service. Reset the oil lifesystem when the oil is changed.See Engine Oil Life System 0 40.

Engine Air Filter Change

When the REPLACE AT NEXT OILCHANGE message displays, theengine air filter should be replacedat the next engine oil change. Whenthe REPLACE ENGINE AIR FILTERSOON message displays, theengine air filter should be replacedat the earliest convenience. Resetthe engine air filter life system afterthe engine air filter is replaced. SeeEngine Air Filter Life System 0 41.

Extended Idle Use

When the vehicle is used in a waythat requires extended idle time,one hour of use shall be deemedthe same as 53 km (33 mi). See“Engine Hours (Hourmeter)” ifequipped, under “Driver InformationCenter (DIC)” in the owner’smanual.

Required Services Every12 000 km/7,500 mi. Check engine oil level and oil

life percentage. If needed,change engine oil and filter,and reset oil life system. SeeEngine Oil 0 38 andEngine Oil Life System 0 40.


Service and Maintenance 57. If equipped with the engine air

filter life system, check the airfilter life percentage.If necessary, replace the engineair filter and reset the engine airfilter life system. See Engine AirFilter Life System 0 41. If thevehicle is not equipped with theengine air filter life system,inspect the engine air cleanerfilter. See Engine Air Cleaner/Filter 0 41.

. Check engine coolant level. SeeCooling System (Engine) 0 42 orCooling System (Turbocharger)0 46.

. Visually check for fluid leaks.

. Visually inspect fuel system fordamage or leaks.

. Visually inspect exhaust systemand nearby heat shields forloose or damaged parts.



Maintenance ScheduleAdditional RequiredServices - Normal

12

00

0k

m/7

,50

0m

i

24

00

0k

m/1

5,0

00

mi

36

00

0k

m/2

2,5

00

mi

48

00

0k

m/3

0,0

00

mi

60

00

0k

m/3

7,5

00

mi

72

00

0k

m/4

5,0

00

mi

84

00

0k

m/5

2,5

00

mi

96

00

0k

m/6

0,0

00

mi

10

80

00

km

/67

,50

0m

i

12

00

00

km

/75

,00

0m

i

13

20

00

km

/82

,50

0m

i

14

40

00

km

/90

,00

0m

i

15

60

00

km

/97

,50

0m

i

16

80

00

km

/10

5,0

00

mi

18

00

00

km

/11

2,5

00

mi

19

20

00

km

/12

0,0

00

mi

20

40

00

km

/12

7,5

00

mi

21

60

00

km

/13

5,0

00

mi

22

80

00

km

/14

2,5

00

mi

24

00

00

km

/15

0,0

00

mi

Perform Required Services. Check engine oillevel and oil life percentage. Change engine oiland filter, if needed. Check engine air filter life per-centage and status. Change engine air filter,if needed.

@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @

If the vehicle is not equipped with the engine airfilter life system, replace engine air cleanerfilter. (1)

@ @ @

Drain and fill engine cooling system. (2) @

Visually inspect accessory drive belts. (3) @

Replace oil pump belt. (4) @

Replace fuel filter. (5) @ @ @ @ @

Footnotes — MaintenanceSchedule Additional RequiredServices - Normal

(1) Or every four years, whichevercomes first. If driving in dustyconditions, inspect the filter at eachoil change or more often as needed.See Engine Air Cleaner/Filter 0 41.

(2) Or every five years, whichevercomes first. See Cooling System(Engine) 0 42 or Cooling System(Turbocharger) 0 46.

(3) Or every 10 years, whichevercomes first. Inspect for fraying,excessive cracking, or damage;replace, if needed.

(4) Or every 15 years, whichevercomes first.

(5) Or every two years, or when theCHANGE FUEL FILTER message inthe Driver Information Center (DIC)comes on, whichever comes first.The fuel filter may need to bereplaced more often based onbiodiesel usage, driving in climateswith severe dust, off-road driving,or towing a trailer for extendedperiods.



Maintenance ScheduleAdditional RequiredServices - Severe

12

00

0k

m/7

,50

0m

i

24

00

0k

m/1

5,0

00

mi

36

00

0k

m/2

2,5

00

mi

48

00

0k

m/3

0,0

00

mi

60

00

0k

m/3

7,5

00

mi

72

00

0k

m/4

5,0

00

mi

84

00

0k

m/5

2,5

00

mi

96

00

0k

m/6

0,0

00

mi

10

80

00

km

/67

,50

0m

i

12

00

00

km

/75

,00

0m

i

13

20

00

km

/82

,50

0m

i

14

40

00

km

/90

,00

0m

i

15

60

00

km

/97

,50

0m

i

16

80

00

km

/10

5,0

00

mi

18

00

00

km

/11

2,5

00

mi

19

20

00

km

/12

0,0

00

mi

20

40

00

km

/12

7,5

00

mi

21

60

00

km

/13

5,0

00

mi

22

80

00

km

/14

2,5

00

mi

24

00

00

km

/15

0,0

00

mi

Perform Required Services. Check engine oillevel and oil life percentage. Change engine oiland filter, if needed. Check engine air filter life per-centage and status. Change engine air filter,if needed.

@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @

If the vehicle is not equipped with the engine airfilter life system, replace engine air cleanerfilter. (1)

@ @ @

Change automatic transmission fluid and filter. @ @ @

Drain and fill engine cooling system. (2) @

Visually inspect accessory drive belts. (3) @

Replace oil pump belt. (4) @

Replace fuel filter. (5) @ @ @ @ @

Footnotes — MaintenanceSchedule Additional RequiredServices - Severe

(1) Or every four years, whichevercomes first. If driving in dustyconditions, inspect the filter at eachoil change or more often as needed.See Engine Air Cleaner/Filter 0 41.

(2) Or every five years, whichevercomes first. See Cooling System(Engine) 0 42 orCooling System (Turbocharger)0 46.

(3) Or every 10 years, whichevercomes first. Inspect for fraying,excessive cracking, or damage;replace, if needed.

(4) Or every 15 years, whichevercomes first.



(5) Or every two years, or when theCHANGE FUEL FILTER message inthe Driver Information Center (DIC)comes on, whichever comes first.The fuel filter may need to bereplaced more often based onbiodiesel usage, when driving inclimates with excessive dust,or when off-road driving or towing atrailer for extended periods.



Recommended Fluids, Lubricants, and Parts

Recommended Fluids and LubricantsThe following fluids apply to vehicles with a Duramax diesel engine. For other fluids not listed here, see“Recommended Fluids and Lubricants” in the owner’s manual.

Fluids and lubricants identified below by name or specification, including fluids or lubricants not listed here, can beobtained from your dealer.

Usage Fluid/Lubricant

Automatic Transmission DEXRON ULV Automatic Transmission Fluid.

Diesel Exhaust AftertreatmentSystem

Diesel Exhaust Fluid that meets ISO 22241 or displays the API DieselExhaust Fluid Certification Mark.

Engine Coolant 50/50 mixture of clean, drinkable water and use only DEX-COOL coolant.See Cooling System (Engine) 0 42 orCooling System (Turbocharger) 0 46.

Engine Oil Engine oil meeting the dexosD specification of the proper SAE viscositygrade. ACDelco dexosD is recommended. See Engine Oil 0 38.



Maintenance Replacement PartsReplacement parts identified below by name, part number, or specification can be obtained from your dealer.

Part GM Part Number ACDelco Part Number

Engine Air Cleaner/Filter 84121219 A3244C

Fuel Filter 23304096 TP1015

Engine Oil Filter 55495105 PF66

Use only the specified filters.



Maintenance RecordsAfter the scheduled services are performed, record the date, odometer reading, who performed the service, and thetype of services performed in the boxes provided. Retain all maintenance receipts.

DateOdometerReading

Serviced By Services Performed


64 Technical Data

Technical Data

Vehicle DataCapacities and

Specifications . . . . . . . . . . . . . . . . 65Engine Drive Belt Routing . . . . . 66


Technical Data 65

Vehicle Data

Capacities and SpecificationsThe following approximate capacities are given in metric and English conversions. See Recommended Fluids andLubricants 0 61.

Application

Capacities

Metric English

Engine Cooling System* 19.1 L 20.2 qt

Diesel Exhaust Fluid (DEF) Tank** 20.3 L 5.3 gal

Engine Oil with Filter 6.6 L 7.0 qt

*Engine cooling system capacity values are based on the entire cooling system and its components.

**Do not overfill the DEF tank. See Diesel Exhaust Fluid 0 20.

All quantities are approximate. When adding, be sure to fill to the appropriate level, as recommended in thismanual. Recheck fluid level after filling.

Engine Specifications

Engine VIN Code Type

3.0L L6 Turbo Diesel (LM2) Engine T Inline 6-Cylinder


66 Technical Data

Engine Drive Belt Routing


Index 67

Index AAccessories and Modifications . . . 35Air Cleaner/Filter, Engine . . . . . . . . 41Air Filter

Life System . . . . . . . . . . . . . . . . . . . . .41Automatic

Transmission Fluid . . . . . . . . . . . . .40

BBattery - North America . . . . . . . . . . 51Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . 26Brake

Exhaust . . . . . . . . . . . . . . . . . . . . . . . .24

CCalifornia Proposition

65 Warning . . . . . . . . . . . . . . . . . . . . . 51Canadian Vehicle Owners . . . . . . . . 2Capacities and Specifications . . . . 65Check

Engine Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . .10

Cluster, Instrument . . . . . . . . . . . . . . . 6Cold Weather Operation . . . . . . . . . 27Cooling System . . . . . . . . . . . . . . 42, 46

DDiesel

Starting Your Engine . . . . . . . . . . . .14Diesel Exhaust Fluid . . . . . . . . . . . . . 20Diesel Exhaust Fluid (DEF)

Warning Light . . . . . . . . . . . . . . . . . . 12Diesel Particulate Filter . . . . . . . . . . 17Drive Belt Routing, Engine . . . . . . . 66Driver Information

Center (DIC) . . . . . . . . . . . . . . . . . . . 12

EElectrical System

Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . .49

EngineAir Cleaner/Filter . . . . . . . . . . . . . . .41Check Light (Malfunction

Indicator) . . . . . . . . . . . . . . . . . . . . . .10Compartment Overview . . . . . . . . .37Cooling System . . . . . . . . . . . . . 42, 46Drive Belt Routing . . . . . . . . . . . . . .66Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49Heater . . . . . . . . . . . . . . . . . . . . . . . . . .16Oil Life System . . . . . . . . . . . . . . . . .40Overheating . . . . . . . . . . . . . . . . . . . .48Starting Your Diesel . . . . . . . . . . . .14

Engine Air Filter Life System . . . . . 41


68 Index

EnginesDiesel Fuel . . . . . . . . . . . . . . . . . . . . .25

Exhaust Brake . . . . . . . . . . . . . . . . . . . 24Exhaust Fluid

Diesel . . . . . . . . . . . . . . . . . . . . . . . . . .20

FFan

Engine . . . . . . . . . . . . . . . . . . . . . . . . . .49Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Replacement (Fuel) . . . . . . . . . . . . .31Filter,

Engine Air Cleaner . . . . . . . . . . . . .41Fluid

Automatic Transmission . . . . . . . .40Fuel

Additives . . . . . . . . . . . . . . . . . . . . . . .25Biodiesel . . . . . . . . . . . . . . . . . . . . . . .26Cold Weather Operation . . . . . . . .27Diesel Engines . . . . . . . . . . . . . . . . .25Filling a Portable Fuel

Container . . . . . . . . . . . . . . . . . . . . .34Filling the Tank . . . . . . . . . . . . . . . . .31Filter Replacement . . . . . . . . . . . . .31Running out of Fuel . . . . . . . . . . . . .30Top Tier . . . . . . . . . . . . . . . . . . . . . . . .24Water in Fuel . . . . . . . . . . . . . . . . . . .27

Fuel for Diesel Engines . . . . . . . . . . 25

FusesEngine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . . .49

GGeneral Information

Service and Maintenance . . . . . . .54

HHeater

Engine . . . . . . . . . . . . . . . . . . . . . . . . . .16

IInstrument Cluster . . . . . . . . . . . . . . . . 6Introduction . . . . . . . . . . . . . . . . . . . . . . . 2

JJump Starting - North America . . . 51

LLamps

Malfunction Indicator (CheckEngine) . . . . . . . . . . . . . . . . . . . . . . .10

LightsCheck Engine (Malfunction

Indicator) . . . . . . . . . . . . . . . . . . . . . .10Diesel Exhaust Fluid (DEF) . . . . .12Wait to Start . . . . . . . . . . . . . . . . . . . . 11

MMaintenance

Records . . . . . . . . . . . . . . . . . . . . . . . .63Maintenance Schedule . . . . . . . . . . 56

Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . .61

Malfunction Indicator Lamp . . . . . . 10

OOil

Engine . . . . . . . . . . . . . . . . . . . . . . . . . .38Engine Oil Life System . . . . . . . . .40

Overheating, Engine . . . . . . . . . . . . . 48

PProposition 65 Warning,

California . . . . . . . . . . . . . . . . . . . . . . . 51

RRecommended Fluids and

Lubricants . . . . . . . . . . . . . . . . . . . . . . 61Records

Maintenance . . . . . . . . . . . . . . . . . . . .63Replacement Parts

Maintenance . . . . . . . . . . . . . . . . . . . .62Routing, Engine Drive Belt . . . . . . . 66Running out of Fuel . . . . . . . . . . . . . . 30


Index 69

SService

Accessories andModifications . . . . . . . . . . . . . . . . . .35

Maintenance Records . . . . . . . . . .63Maintenance, General

Information . . . . . . . . . . . . . . . . . . . .54Specifications and Capacities . . . . 65Starting the Diesel Engine . . . . . . . 14Supplement

Using . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2System

Engine Air Filter Life . . . . . . . . . . . .41

TTop Tier Fuel . . . . . . . . . . . . . . . . . . . . 24Towing

Trailer . . . . . . . . . . . . . . . . . . . . . . . . . .34Trailer

Towing . . . . . . . . . . . . . . . . . . . . . . . . . .34Transmission

Fluid, Automatic . . . . . . . . . . . . . . . .40

UUsing This Supplement . . . . . . . . . . . 2

VVehicle

Canadian Owners . . . . . . . . . . . . . . . 2

WWait to Start Light . . . . . . . . . . . . . . . 11Water in Fuel . . . . . . . . . . . . . . . . . . . . 27

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Documents

C M Y CM MY CY CMY K · starting the engine, as a check to show the light is working. If the wait-to-start light comes on, the glow plug system is required and operating. Wait until