engine CHEVROLET EXPRESS CARGO VAN 2017 1.G Workshop Manual

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
Driving and Operating 183
Warning (Continued)
.There are holes or openingsin the vehicle body fromdamage or aftermarketmodifications that are notcompletely sealed.
If unusual fumes are detected or
if it is suspected that exhaust is
coming into the vehicle:
.Drive it only with thewindows completely down.
.Have the vehicle repairedimmediately.
Never park the vehicle with the
engine running in an enclosed
area such as a garage or a
building that has no fresh air
ventilation.
Running the Vehicle
While Parked
It is better not to park with theengine running.
If the vehicle is left with the enginerunning, follow the proper steps tobe sure the vehicle will not move.SeeShifting Into Park0180andEngine Exhaust0182.
If parking on a hill and pulling atrailer, seeDriving Characteristicsand Towing Tips0202.
Automatic
Transmission
Ashiftpositionindicatorisintheinstrument cluster.
There are several different positionsfor the shift lever.
See“Range Selection Mode”underManual Mode0186.
P:This position locks the rearwheels. It is the best position to usewhen starting the engine becausethe vehicle cannot move easily.When parked on a hill, especiallywhen the vehicle has a heavy load,you might notice an increase in theeffort to shift out of P (Park). See“To r q u e L o c k”underShifting IntoPark0180.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
184 Driving and Operating
{Warning
It is dangerous to get out of the
vehicle if the shift lever is not fully
in P (Park) with the parking brake
firmly set. The vehicle can roll.
Do not leave the vehicle when the
engine is running. If you have left
the engine running, the vehicle
can move suddenly. You or others
could be injured. To be sure the
vehicle will not move, even when
you are on fairly level ground,
always set the parking brake and
move the shift lever to P (Park).
SeeShifting Into Park0180and
Driving Characteristics and
To w i n g T i p s0202.
R:Use this gear to back up.
Caution
Shifting to R (Reverse) while the
vehicle is moving forward could
damage the transmission. The
(Continued)
Caution (Continued)
repairs would not be covered by
the vehicle warranty. Shift to
R(Reverse) only after the vehicle
is stopped.
To r o c k t h e v e h i c l e b a c k a n d f o r t h t oget out of snow, ice, or sand withoutdamaging the transmission, seeIfthe Vehicle Is Stuck0171.
N:In this position, the engine doesnot connect with the wheels.To r e s t a r t w h e n y o u a r e a l r e a d ymoving, use N (Neutral) only. Also,use N (Neutral) when the vehicle isbeing towed.
{Warning
Shifting into a drive gear while the
engine is running at high speed is
dangerous. Unless your foot is
firmly on the brake pedal, the
vehicle could move very rapidly.
Yo u c o u l d l o s e c o n t r o l a n d h i t
(Continued)
Warning (Continued)
people or objects. Do not shift
into a drive gear while the engine
is running at high speed.
Caution
Shifting out of P (Park) or
N(Neutral) with the engine
running at high speed may
damage the transmission. The
repairs would not be covered by
the vehicle warranty. Be sure the
engine is not running at high
speed when shifting the vehicle.
D:This position is for normaldriving. It provides the best fueleconomy. If you need more powerfor passing, and you are:
.Going less than about 55 km/h(35 mph), push the acceleratorpedal about halfway down.
.Going about 55 km/h (35 mph) ormore, push the accelerator allthe way down.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
Driving and Operating 185
By doing this, the vehicle shiftsdown to the next gear and hasmore power.
D(Drive) can be used when towingatrailer,carryingaheavyload,or driving on steep hills. You mightwant to shift the transmission to alower gear selection if thetransmission shifts too often.
Downshifting the transmission inslippery road conditions could resultin skidding. See“Skidding”underLoss of Control0167.
The vehicle has a shift stabilizationfeature that adjusts the transmissionshifting to the current drivingconditions in order to reduce rapidupshifts and downshifts. This shiftstabilization feature is designed todetermine, before making anupshift, if the engine is able tomaintain vehicle speed by analyzingthings such as vehicle speed,throttle position, and vehicle load.If the shift stabilization featuredetermines that a current vehiclespeed cannot be maintained, thetransmission does not upshift andinstead holds the current gear.
In some cases, this could appear tobe a delayed shift, however thetransmission is operating normally.
The transmission uses adaptiveshift controls. Adaptive shift controlscontinually compare key shiftparameters to pre-programmedideal shifts stored in thetransmission’scomputer.Thetransmission constantly makesadjustments to improve vehicleperformance according to how thevehicle is being used, such as withaheavyloadorwhenthetemperature changes. During thisadaptive shift control process,shifting might feel different as thetransmission determines the bestsettings.
The shift quality of a new vehiclemay not be ideal because theadaptive shift control process maynot have determined the bestsettings for a particular shift orcondition. Shift quality will improvewith continued driving.
When temperatures are very cold,the transmission's gear shiftingcould be delayed, providing more
stable shifts until the engine warmsup. Shifts could be more noticeablewith a cold transmission. Thisdifference in shifting is normal.
M:This position lets drivers selectthe range of gears appropriate forcurrent driving conditions. If thevehicle has this feature, see“RangeSelection Mode”underManualMode0186.
3:This position is also used fornormal driving. It reduces vehiclespeed more than D (Drive) withoutusing the brakes. You might choose3(Third) instead of D(Drive) whendriving on hilly, winding roads; whentowing a trailer, so there is lessshifting between gears; and whengoing down a steep hill. See“RangeSelection Mode”underManualMode0186.
2:This position reduces vehiclespeed even more than 3 (Third)without using the brakes. You canuse 2 (Second) on hills. It can helpcontrol vehicle speed as you godown steep mountain roads, butthen you would also want to use the

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
186 Driving and Operating
brakes off and on. See“RangeSelection Mode”underManualMode0186.
If you manually select 2 (Second) inan automatic transmission, thetransmission will start insecond gear. You can use thisfeature for reducing the speed of therear wheels when trying to start thevehicle from a stop on slippery roadsurfaces.
1:This position reduces vehiclespeed without using the brakes.Yo u c a n u s e i t f o r m a j o r / s e v e r edowngrades where the vehiclewould otherwise accelerate due tosteepness of grade. When you shiftto 1 (First) it provides the lowestgear appropriate to current roadspeed and continues to downshiftas the vehicle slows, eventuallydownshifting to 1 (First) gear. Thetransmission can be held in 1 (First)gear using Range Selection Modeor the shift lever. See“RangeSelection Mode”underManualMode0186.
Caution
Spinning the tires or holding the
vehicle in one place on a hill
using only the accelerator pedal
may damage the transmission.
The repair will not be covered by
the vehicle warranty. If you are
stuck, do not spin the tires. When
stopping on a hill, use the brakes
to hold the vehicle in place.
Normal Mode Grade Braking
This mode is enabled when thevehicle is started, but is not enabledin Range Selection Mode. It assistsin maintaining desired vehiclespeeds when driving on downhillgrades by using the engine andtransmission to slow the vehicle.The first time the system activatesfor each ignition key cycle, a DICmessage will be displayed. SeeTr a n s m i s s i o n M e s s a g e s011 8.
To d i s a b l e o r e n a b l e N o r m a l M o d eGrade Braking within the currentignition key cycle, press and holdthe Tow/Haul button for
three seconds. A DIC messagedisplays. SeeTr a n s m i s s i o nMessages011 8.
For other forms of grade braking,seeTo w / H a u l M o d e0187andCruise Control0192.
Manual Mode
Range Selection Mode
If equipped, Range Selection Modehelps control the vehicle'stransmission and vehicle speedwhile driving downhill or towing atrailer by letting you select a desiredrange of gears.
To u s e t h i s f e a t u r e :
1. Move the shift lever toM(ManualMode).

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
188 Driving and Operating
Tow/Haul Mode Grade Braking
To w / H a u l M o d e G r a d e B r a k i n g i sonly enabled while the Tow/HaulMode is selected and the vehicle isnot in the Range Selection Mode.See“To w / H a u l M o d e”listedpreviously andManual Mode0186.To w / H a u l M o d e G r a d e B r a k i n gassists in maintaining desiredvehicle speeds when driving ondownhill grades by using the engineand transmission to slow thevehicle.
To d i s a b l e o r e n a b l e To w / H a u l M o d eGrade Braking within the currentignition key cycle, press and holdthe Tow/Haul button forthree seconds. A DIC message willbe displayed. SeeTr a n s m i s s i o nMessages011 8.
SeeTo w i n g E q u i p m e n t0210.
For other forms of grade braking,seeAutomatic Transmission0183andCruise Control0192.
Brakes
Antilock Brake
System (ABS)
This vehicle has an Antilock BrakeSystem (ABS), an advancedelectronic braking system that helpsprevent a braking skid.
When the vehicle begins to driveaway, ABS checks itself.Amomentarymotororclickingnoisemay be heard while this test is goingon, and it may even be noticed thatthe brake pedal moves a little. Thisis normal.
If there is a problem with ABS, thiswarning light stays on. SeeAntilockBrake System (ABS) WarningLight0104.
If driving safely on a wet road and itbecomes necessary to slam on thebrakes and continue braking toavoid a sudden obstacle, acomputer senses the wheels areslowing down. If one of the wheelsis about to stop rolling, the computerwill separately work the brakes ateach wheel.
ABS can change the brake pressureto each wheel, as required, fasterthan any driver could. This can helpyou steer around the obstacle whilebraking hard.
As the brakes are applied, thecomputer keeps receiving updateson wheel speed and controlsbraking pressure accordingly.
Remember: ABS does not changethe time needed to get a foot up tothe brake pedal or always decreasestopping distance. If you get tooclose to the vehicle in front of you,there will not be enough time toapply the brakes if that vehiclesuddenly slows or stops. Alwaysleave enough room up ahead tostop, even with ABS.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
Driving and Operating 191
appropriate messages will bedisplayed in the DIC. SeeRideControl System Messages011 6.
To t u r n S t a b i l i T r a k a n d T C S b a c k
on, pressgagain. StabiliTrak will
automatically turn back on when thevehicle speed exceeds 40 km/h(25 mph).
When the StabiliTrak system hasbeen turned off, system noises maystill be heard as a result of thebrake-traction control coming on.
It is recommended to leave thesystem on for normal drivingconditions, but it may be necessaryto turn the system off if the vehicleis stuck in sand, mud, ice, or snow,and you want to“rock”the vehicle toattempt to free it. SeeIf the VehicleIs Stuck0171.
StabiliTrak System Operation
The StabiliTrak system is normallyon, except when the system isinitializing or has been disabled withthe StabiliTrak button. TheStabiliTrak system will automaticallyactivate to assist the driver inmaintaining vehicle directional
control in most driving conditions.When activated, the StabiliTraksystem may reduce engine power tothe wheels and apply braking toindividual wheels as necessary toassist the driver with vehicledirectional control. If cruise controlis being used when StabiliTrakactivates, the cruise controlautomatically disengages. Thecruise control can be re-engagedwhen road conditions allow. SeeCruise Control0192.
The StabiliTrak system may alsoturn off automatically if it determinesthat a problem exists with thesystem. If the problem does notclear itself after restarting thevehicle, see your dealer for service.
Traction Control Operation
TCS is part of the StabiliTraksystem. TCS limits wheel spin byreducing engine power to thewheels and by applying brakes toeach individual wheel as necessary.
If the brake-traction control systemactivates constantly or if the brakeshave heated up due to high speedbraking, the brake-traction control
will be automatically disabled. Thesystem will come back on after thebrakes have cooled. This can takeup to two minutes or longerdepending on brake usage.
TCS may activate on dry or roughroads or under conditions such asheavy acceleration while turning orabrupt upshifts/downshifts of thetransmission. When this reduction inacceleration occurs, it may benoticed, or a noise or vibration maybe heard. This is normal.
Adding non-dealer accessories canaffect the vehicle's performance.SeeAccessories andModifications0216.
Locking Rear Axle
Vehicles with a locking rear axle cangive more traction on snow, mud,ice, sand, or gravel. It works like astandard axle most of the time, butwhen traction is low, this feature willallow the rear wheel with the mosttraction to move the vehicle.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
194 Driving and Operating
.Vehicles with a 6-speedautomatic transmission haveCruise Grade Braking to helpmaintain driver selected speed.
Cruise Grade Braking is enabledwhen the vehicle is started andcruise control is active. It is notenabled in Range Selection Mode.It assists in maintaining driverselected speed when driving ondownhill grades by using the engineand transmission to slow thevehicle.
To d i s a b l e a n d e n a b l e C r u i s e G r a d eBraking for the current ignition keycycle, press and hold the Tow/Haulbutton for three seconds. A DICmessage displays. SeeTr a n s m i s s i o n M e s s a g e s011 8.
When the brakes are applied thecruise control is disengaged.
Ending Cruise Control
There are four ways to end cruisecontrol:
.Step lightly on the brake pedal.
.Press[.
.Shift the transmission toN(Neutral).
.To t u r n o f f c r u i s e c o n t r o l ,
pressI.
Erasing Speed Memory
The cruise control set speed is
erased from memory ifIis
pressed or if the vehicle isturned off.
Driver Assistance
Systems
Rear Vision
Camera (RVC)
If equipped, the RVC system isdesigned to help the driver whenbacking up by displaying a view ofthe area behind the vehicle.
{Warning
The camera(s) do not display
children, pedestrians, bicyclists,
crossing traffic, animals, or any
other object outside of the
cameras’field of view, below the
bumper, or under the vehicle.
Shown distances may be different
from actual distances. Do not
drive or park the vehicle using
only these camera(s). Always
check behind and around the
vehicle before driving. Failure to
use proper care may result in
injury, death, or vehicle damage.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
198 Driving and Operating
.Atrailerisattachedtothevehicle, or a bicycle or an objecthanging out of the rear doorduring the current or last drivecycle. RPA will return to normaloperation after it is determinedthe object is removed. Thiscould take a few drive cycles.
.Atowbarisattachedtothevehicle.
Other conditions may affect systemperformance, such as vibrationsfrom a jackhammer or thecompression of air brakes on a verylarge truck.
Fuel
For diesel engine vehicles, see“Fuel for Diesel Engines”in theDuramax diesel supplement.
GM recommends the use of TOPTIER Detergent Gasoline to keepthe engine cleaner and reduceengine deposits. Seewww.toptiergas.com for a list of TOPTIER Detergent Gasoline marketersand applicable countries.
If the vehicle has a yellow fuel capor a yellow sticker on the fuel door,E85 or FlexFuel can be used. SeeE85 or FlexFuel0199.
Use regular unleaded gasolinemeeting ASTM specification D4814with a posted octane rating of 87 orhigher. Do not use gasoline with aposted octane rating of less than 87,as this may cause engine knock andwill lower fuel economy.
Prohibited Fuels
Caution
Do not use fuels with any of the
following conditions; doing so
may damage the vehicle and void
its warranty:
.For vehicles which are notFlexFuel, fuel labeledgreater than 15% ethanol byvolume, such as mid-levelethanol blends (16–50%ethanol), E85, or FlexFuel.
.Fuel with any amount ofmethanol, methylal, andaniline. These fuels cancorrode metal fuel systemparts or damage plastic andrubber parts.
(Continued)

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
Driving and Operating 199
Caution (Continued)
.Fuel containing metals suchas methylcyclopentadienylmanganese tricarbonyl(MMT), which can damagethe emissions controlsystem and spark plugs.
.Fuel with a posted octanerating of less than therecommended fuel. Usingthis fuel will lower fueleconomy and performance,and may decrease the life ofthe emissions catalyst.
California Fuel
Requirements
If the vehicle is certified to meetCalifornia Emissions Standards, it isdesigned to operate on fuels thatmeet California specifications. Seethe underhood emission controllabel. If this fuel is not available instates adopting California EmissionsStandards, the vehicle will operatesatisfactorily on fuels meetingfederal specifications, but emission
control system performance may beaffected. The malfunction indicatorlamp could turn on and the vehiclemay not pass a smog-check test.SeeMalfunction Indicator Lamp(Check Engine Light)0102.Ifthisoccurs, return to your authorizeddealer for diagnosis. If it isdetermined that the condition iscaused by the type of fuel used,repairs may not be covered by thevehicle warranty.
Fuels in Foreign
Countries
The U.S., Canada, and Mexico postfuel octane ratings in anti-knockindex (AKI). For fuel not to use in aforeign country, see“ProhibitedFuels”inFuel0198.
Fuel Additives
To k e e p f u e l s y s t e m s c l e a n , T O PTIER Detergent Gasoline isrecommended. SeeFuel0198.
If TOP TIER Detergent Gasoline isnot available, one bottle of GM FuelSystem Treatment Cleaner added tothe fuel tank at every engine oil
change, can help. GM Fuel SystemTreatment Cleaner is the onlygasoline additive recommended byGeneral Motors. It is available atyour dealer.
If your vehicle is able to use E85 orFlexFuel, GM Fuel SystemTreatment Cleaner - FlexFuel is theonly recommended additive for use.Do not use any other additives withan E85 or FlexFuel vehicle. SeeE85 or FlexFuel0199.
E85 or FlexFuel
Vehicles with a yellow fuel cap canuse either unleaded gasoline or fuelcontaining up to 85% ethanol (E85).All other vehicles should use onlythe unleaded gasoline as describedinFuel0198.
The use of E85 or FlexFuel isencouraged when the vehicle isdesigned to use it. E85 or FlexFuelis made from renewable sources.
To h e l p l o c a t e f u e l s t a t i o n s t h a tcarry E85 or FlexFuel, the U.S.Department of Energy has an

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9967827) - 2017 - crc - 5/6/16
200 Driving and Operating
alternative fuels website. Seewww.afdc.energy.gov/afdc/locator/stations.
E85 or FlexFuel should meet ASTMSpecification D 5798 or CAN/CGSB–3.512 in Canada. Do not usethe fuel if the ethanol content isgreater than 85%. Fuel mixtures thatdo not meet ASTM or CGSBspecifications can affect driveabilityand could cause the malfunctionindicator lamp to come on.
After refueling, the vehiclecalculates the composition of thefuel. It is not recommended torepeatedly switch between fuels.If fuels are switched frequently, addas much fuel as possible and do notadd less than 11 L (3 gal) whenrefueling. Drive at least 11 km (7 mi)immediately after refueling to allowthe vehicle to adapt to the change inethanol concentration.
Because E85 or FlexFuel has lessenergy per liter (gallon) thangasoline, the vehicle will need to berefilled more often. SeeFilling theTa n k0200.
Caution
Some additives are not
compatible with E85 or FlexFuel
and can harm the vehicle's fuel
system. Do not add anything to
E85 or FlexFuel. Damage caused
by additives would not be covered
by the vehicle warranty.
Caution
Do not use fuel containing
methanol. It can corrode metal
parts in the fuel system and also
damage plastic and rubber parts.
That damage would not be
covered under the vehicle
warranty.
Filling the Tank
{Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
.To h e l p a v o i d i n j u r i e s t o y o uand others, read and followall the instructions on thefuel pump island.
.Turn off the engine whenrefueling.
.Keep sparks, flames, andsmoking materials awayfrom fuel.
.Do not leave the fuel pumpunattended.
.Do not use a cell phonewhile refueling.
.Do not re-enter the vehiclewhile pumping fuel.
.Keep children away fromthe fuel pump and never letchildren pump fuel.
(Continued)