2021 GMC SAVANA transmission fluid

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Instruments and Controls 85
the tire positions, seeTire Pressure Monitor
System 0217. See Tire Inspection 0220 and
Tire Rotation 0220.
Change Compass Zone
The vehicle may have this feature. To
change the compass zone through the DIC,
see Compass 067.
Calibrate Compass
The vehicle may have this feature. The
compass can be manually calibrated. To
calibrate the compass through the DIC, see
Compass 067.
Blank Display
This display shows no information.
Vehicle Messages
Messages displayed on the DIC indicate the
status of the vehicle or some action that
may be needed to correct a condition.
Multiple messages may appear one after
another.
The messages that do not require
immediate action can be acknowledged and
cleared by pressing
V. The messages that
require immediate action cannot be cleared
until that action is performed. All messages should be taken seriously;
clearing the message does not correct the
problem.
If a SERVICE message appears, see your
dealer.
Follow the instructions given in the
messages. The system displays messages
regarding the following topics:
.Service Messages
.Fluid Levels
.Vehicle Security
.Brakes
.Steering
.Ride Control Systems
.Driver Assistance Systems
.Cruise Control
.Lighting and Bulb Replacement
.Wiper/Washer Systems
.Doors and Windows
.Seat Belts
.Airbag Systems
.Engine and Transmission
.Tire Pressure
.Battery
Engine Power Messages
ENGINE POWER IS REDUCED
This message displays when the vehicle's
propulsion power is reduced. A reduction in
propulsion power can affect the vehicle's
ability to accelerate. If this message is on,
but there is no observed reduction in
performance, proceed to your destination.
Under certain conditions the performance
may be reduced the next time the vehicle is
driven. The vehicle may be driven while this
message is on, but maximum acceleration
and speed may be reduced. Anytime this
message stays on, or displays repeatedly,
the vehicle should be taken to your dealer
for service as soon as possible.
Under certain operating conditions,
propulsion will be disabled. Try restarting
after the ignition has been off for
30 seconds.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Driving and Operating 129
.Ease your foot off the accelerator pedal
and steer the way you want the vehicle
to go. The vehicle may straighten out. Be
ready for a second skid if it occurs.
.Slow down and adjust your driving
according to weather conditions. Stopping
distance can be longer and vehicle control
can be affected when traction is reduced
by water, snow, ice, gravel, or other
material on the road. Learn to recognize
warning clues—such as enough water,
ice, or packed snow on the road to make
a mirrored surface —and slow down
when you have any doubt.
.Try to avoid sudden steering, acceleration,
or braking, including reducing vehicle
speed by shifting to a lower gear. Any
sudden changes could cause the tires to
slide.
Remember: Antilock brakes help avoid only
the braking skid.
Driving on Wet Roads
Rain and wet roads can reduce vehicle
traction and affect your ability to stop and
accelerate. Always drive slower in these
types of driving conditions and avoid driving
through large puddles and deep-standing or
flowing water.
{Warning
Wet brakes can cause crashes. They
might not work as well in a quick stop
and could cause pulling to one side. You
could lose control of the vehicle.
After driving through a large puddle of
water or a car/vehicle wash, lightly apply
the brake pedal until the brakes work
normally.
Flowing or rushing water creates strong
forces. Driving through flowing water
could cause the vehicle to be carried
away. If this happens, you and other
vehicle occupants could drown. Do not
ignore police warnings and be very
cautious about trying to drive through
flowing water.
Hydroplaning
Hydroplaning is dangerous. Water can build
up under the vehicle's tires so they actually
ride on the water. This can happen if the
road is wet enough and you are going fast
enough. When the vehicle is hydroplaning, it
has little or no contact with the road. There is no hard and fast rule about
hydroplaning. The best advice is to slow
down when the road is wet.
Other Rainy Weather Tips
Besides slowing down, other wet weather
driving tips include:
.Allow extra following distance.
.Pass with caution.
.Keep windshield wiping equipment in
good shape.
.Keep the windshield washer fluid reservoir
filled.
.Have good tires with proper tread depth.
See
Tires 0211.
.Turn off cruise control.
Hill and Mountain Roads
Driving on steep hills or through mountains
is different than driving on flat or rolling
terrain. Tips include:
.Keep the vehicle serviced and in good
shape.
.Check all fluid levels and brakes, tires,
cooling system, and transmission.
.Shift to a lower gear when going down
steep or long hills.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Driving and Operating 143
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.
Caution
A transmission hot message may display
if the automatic transmission fluid is too
hot. Driving under this condition can
damage the vehicle. Stop and idle the
engine to cool the automatic
transmission fluid. This message clears
when the transmission fluid has cooled
sufficiently.
D : This position is for normal driving.
It provides the best fuel economy. If you
need more power for passing, and you are:
.Going less than about 55 km/h (35 mph),
push the accelerator pedal about
halfway down.
.Going about 55 km/h (35 mph) or more,
push the accelerator all the way down. By doing this, the vehicle shifts down to
the next gear and has more power.
D (Drive) can be used when towing a trailer,
carrying a heavy load, or driving on steep
hills. You might want to shift the
transmission to a lower gear selection if the
transmission shifts too often.
Downshifting the transmission in slippery
road conditions could result in skidding. See
“Skidding” underLoss of Control 0128.
The vehicle has a shift stabilization feature
that adjusts the transmission shifting to the
current driving conditions in order to reduce
rapid upshifts and downshifts. This shift
stabilization feature is designed to
determine, before making an upshift, if the
engine is able to maintain vehicle speed by
analyzing things such as vehicle speed,
throttle position, and vehicle load. If the
shift stabilization feature determines that a
current vehicle speed cannot be maintained,
the transmission does not upshift and
instead holds the current gear. In some
cases, this could appear to be a delayed
shift, however the transmission is operating
normally.
The transmission uses adaptive shift
controls. Adaptive shift controls continually
compare key shift parameters to pre-programmed ideal shifts stored in the
transmission’s computer. The transmission
constantly makes adjustments to improve
vehicle performance according to how the
vehicle is being used, such as with a heavy
load or when the temperature changes.
During this adaptive shift control process,
shifting might feel different as the
transmission determines the best settings.
The shift quality of a new vehicle may not
be ideal because the adaptive shift control
process may not have determined the best
settings for a particular shift or condition.
Shift quality will improve with continued
driving.
When temperatures are very cold, the
transmission's gear shifting could be
delayed, providing more stable shifts until
the engine warms up. Shifts could be more
noticeable with a cold transmission. This
difference in shifting is normal.
M :
This position lets drivers select the
range of gears appropriate for current
driving conditions. If the vehicle has this
feature, see “Range Selection Mode” under
Manual Mode 0144.
1 : This position reduces vehicle speed
without using the brakes. You can use it for
major/severe downgrades where the vehicle

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
164 Driving and Operating
2. Start the engine and shift into a gear.
3. Release the parking brake.
4. Let up on the brake pedal.
5. Drive slowly until the tires are clear ofthe chocks.
6. Stop and have someone pick up and store the chocks.
7. Slowly pull the trailer from the water.
Caution
If the vehicle tires begin to spin and the
vehicle begins to slide toward the water,
remove your foot from the accelerator
pedal and apply the brake pedal. Seek
help to have the vehicle towed up
the ramp.
Maintenance when Trailer Towing
The vehicle needs service more often when
used to tow trailers. See Maintenance
Schedule 0249. It is especially important to
check the automatic transmission fluid,
engine oil, axle lubricant, belts, cooling
system, and brake system before and during
each trip.
Check periodically that all nuts and bolts on
the trailer hitch are tight.
Engine Cooling when Trailer Towing
The cooling system may temporarily
overheat during severe operating conditions.
See Engine Overheating 0194.
Trailer Towing
If equipped with a diesel engine, see the
Duramax diesel supplement.
Caution
Towing a trailer improperly can damage
the vehicle and result in costly repairs
not covered by the vehicle warranty. To
tow a trailer correctly, follow the
directions in this section and see your
dealer for important information about
towing a trailer with the vehicle.
Trailering is different than just driving the
vehicle by itself. Trailering means changes in
handling, acceleration, braking, durability,
and fuel economy. Successful, safe trailering
takes correct equipment, and it has to be
used properly.
The following information has many
time-tested, important trailering tips and
safety rules. Many of these are important
for your safety and that of your passengers.
Read this section carefully before pulling a
trailer.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 177
Vehicle Care
General Information
General Information . . . . . . . . . . . . . . . . . . . 178
California Proposition 65 Warning . . . . . 178
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 178
Accessories and Modifications . . . . . . . . . 178
Vehicle Checks
Doing Your Own Service Work . . . . . . . . . 179
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Engine Compartment Overview . . . . . . . . 180
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Engine Oil Life System . . . . . . . . . . . . . . . . 186
Automatic Transmission Fluid (6-Speed Transmission) . . . . . . . . . . . . . . . . . . . . . . . . 186
Automatic Transmission Fluid (8-Speed Transmission) . . . . . . . . . . . . . . . . . . . . . . . . 189
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . 189
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 191
Engine Overheating . . . . . . . . . . . . . . . . . . . 194
Engine Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Power Steering Fluid . . . . . . . . . . . . . . . . . . 196
Washer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Battery - North America . . . . . . . . . . . . . . . 198
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Noise Control System . . . . . . . . . . . . . . . . . 199 Starter Switch Check . . . . . . . . . . . . . . . . . . 200
Automatic Transmission Shift Lock
Control Function Check . . . . . . . . . . . . . . 201
Ignition Transmission Lock Check . . . . . . 201
Park Brake and P (Park) Mechanism Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Wiper Blade Replacement . . . . . . . . . . . . . 201
Windshield Replacement . . . . . . . . . . . . . . 202
Headlamp Aiming
Front Headlamp Aiming . . . . . . . . . . . . . . . 202
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . 202
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 202
Front Turn Signal, Sidemarker, and Parking Lamps . . . . . . . . . . . . . . . . . . . . . . . 202
Taillamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Center High-Mounted Stoplamp (CHMSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
License Plate Lamp . . . . . . . . . . . . . . . . . . . . 204
Electrical System
Electrical System Overload . . . . . . . . . . . . 205
Fuses and Circuit Breakers . . . . . . . . . . . . . 205
Engine Compartment Fuse Block . . . . . . 206
Floor Console Fuse Block . . . . . . . . . . . . . . 209
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . 211
Winter Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 Tire Sidewall Labeling . . . . . . . . . . . . . . . . . . 212
Tire Designations . . . . . . . . . . . . . . . . . . . . . . 213
Tire Terminology and Definitions . . . . . . 214
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Tire Pressure Monitor System . . . . . . . . . . 217
Tire Pressure Monitor Operation . . . . . . . 217
Tire Inspection . . . . . . . . . . . . . . . . . . . . . . . . 220
Tire Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . 220
When It Is Time for New Tires . . . . . . . . 222
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . 222
Different Size Tires and Wheels . . . . . . . 224
Uniform Tire Quality Grading . . . . . . . . . 224
Wheel Alignment and Tire Balance . . . . 225
Wheel Replacement . . . . . . . . . . . . . . . . . . . 225
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . 226
Tire Changing . . . . . . . . . . . . . . . . . . . . . . . . . 228
Full-Size Spare Tire . . . . . . . . . . . . . . . . . . . . 235
Jump Starting
Jump Starting - North America . . . . . . . . 236
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . . . . . . . . . . 239
Recreational Vehicle Towing . . . . . . . . . . . 239
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
186 Vehicle Care
trash or pouring it on the ground, into
sewers, or into streams or bodies of water.
Recycle it by taking it to a place that
collects used oil.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system that
indicates when to change the engine oil and
filter. This is based on a combination of
factors which include engine revolutions,
engine temperature, and miles driven. Based
on driving conditions, the mileage at which
an engine oil change is indicated can vary
considerably. For the oil life system to work
properly, the system must be reset every
time the oil is changed.
When the system has calculated that oil life
has been diminished, it indicates that an oil
change is necessary. A CHANGE ENGINE OIL
SOON message comes on. Change the oil as
soon as possible within the next 1 000 km
(600 mi). It is possible that, if driving under
the best conditions, the oil life system
might indicate that an oil change is not
necessary for up to a year. The engine oil
and filter must be changed at least once a
year and, at this time, the system must be
reset. Your dealer has trained service peoplewho will perform this work and reset the
system. It is also important to check the oil
regularly over the course of an oil drain
interval and keep it at the proper level.
If the system is ever reset accidentally, the
oil must be changed at 5 000 km (3,000 mi)
since the last oil change. Remember to reset
the oil life system whenever the oil is
changed.
How to Reset the Engine Oil Life System
Reset the system whenever the engine oil is
changed so that the system can calculate
the next engine oil change.
To reset the Engine Oil Life System on most
models:
1. Display the OIL LIFE REMAINING on the DIC. See Driver Information Center (DIC)
0 81.
2. Press and hold
Von the DIC while the
Oil Life display is active. The oil life will
change to 100%.
The oil life system can also be reset as
follows: 1. Display the OIL LIFE REMAINING on the DIC. See Driver Information Center (DIC)
0 81. 2. Fully press and release the accelerator
pedal three times within five seconds.
If the display shows 100%, the system is
reset.
If the CHANGE ENGINE OIL SOON message
comes back on when the vehicle is started,
the engine oil life system has not reset.
Repeat the procedure.
Automatic Transmission Fluid
(6-Speed Transmission)
When to Check and Change Automatic
Transmission Fluid
It is usually not necessary to check the
transmission fluid level. The only reason for
fluid loss is a transmission leak or
overheated transmission. If a small leak is
suspected, use the following procedures to
check the fluid level. However, if there is a
large leak, it may be necessary to have the
vehicle towed to a dealer and have it
repaired before driving the vehicle further.
Change the fluid and filter at the intervals
listed in Maintenance Schedule 0249, and
be sure to use the transmission fluid listed
in Recommended Fluids and Lubricants
0 255.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
Vehicle Care 187
How to Check Automatic Transmission
Fluid
Because this operation can be difficult, it is
recommended to have this check done at
your dealer, which can monitor the
transmission temperature. The transmission
fluid level increases with temperature. To
obtain a highly accurate fluid level check,
the transmission temperature must be
measured.
If it is decided to check the fluid level, be
sure to follow all the instructions here, or a
false reading on the dipstick may occur.
Caution
Too much or too little fluid can damage
the transmission. Too much can mean
that some of the fluid could come out
and fall on hot engine parts or exhaust
system parts, starting a fire. Too little
fluid could cause the transmission to
overheat. Be sure to get an accurate
reading if checking the transmission fluid.
Wait at least 30 minutes with the engine
off, before checking the transmission fluid
level if the vehicle has been driven:
.In hot weather, when outside
temperatures are above 32 °C (90 °F).
.The vehicle is heavily loaded.
.At high speed for quite a while in hot
weather.
.In heavy traffic and hot weather.
.While pulling a trailer.
After driving under these conditions, a hot
check can be performed. The fluid should be
hot, which is 71 °C to 93 °C (160 °F to
200 °F).
A cold fluid level check can be performed
after the vehicle has been sitting for eight
hours or more with the engine off, but this
is used only as a reference. Let the engine
run at idle for five minutes if the outside
temperature is between 15 °C to 32 °C (60 °F
to 90 °F). Should the fluid level be low
during this cold check, the fluid must be
checked warm or hot before adding fluid.
If the outside temperature is colder than 15 °
C (60 °F) or hotter than 32 °C (90 °F), a cold
check cannot be performed.
A warm fluid level check can be performed
by driving the vehicle under lightly loaded
conditions and outside temperatures
between 10 °C to 27 °C (50 °F to 80 °F). The
vehicle should be driven for at least 24 km (15 mi) before performing a warm check.
Checking the fluid warm or hot will give a
more accurate reading of the fluid level than
a cold check.
Because the vehicle is equipped with a
high-efficiency air-to-oil cooler, the
transmission fluid temperature may not
reach the required hot fluid level checking
temperature under normal lightly loaded
driving vehicle conditions.
Checking the Fluid Level
Prepare the vehicle:
1. Park the vehicle on a level place. Keep the engine running.
2. With the parking brake applied, place the shift lever in P (Park).
3. With a foot on the brake pedal, move the shift lever through each gear range,
pausing for about three seconds in each
range. When M is reached, move the
selector from M1 through M3. Then,
position the shift lever in P (Park).
4. Let the engine run at idle for two minutes or more.
Then, without shutting off the engine, use
the steps that follow.

GMC Savana Owner Manual (GMNA-Localizing-U.S./Canada-14583543) -
2021 - crc - 7/10/20
188 Vehicle Care
The transmission dipstick is near the center
of the engine compartment and will be
labeled with the graphic shown.
SeeEngine Compartment Overview 0180 for
more information on location.
1. COLD Range
2. WARM Range
3. HOT Range
1. Flip the handle up, pull out the dipstick, and wipe it with a clean rag or paper
towel.
2. Push it back in all the way, wait three seconds, and pull it back out again. 3. Check both sides of the dipstick, and
read the lower level. The fluid level must
be in the COLD (1) range for a cold check,
transmission temperature 27 °C to 32 °C
(80 °F to 90 °F); between the COLD (1)
and HOT (3) range for a WARM (2) check,
50 °C to 60 °C (122 °F to 140 °F); or in the
HOT (3) cross-hatched range for a hot
check, 71 °C to 93 °C (160 °F to 200 °F). Be
sure to keep the dipstick pointed down
to get an accurate reading.
4. If the fluid level is in the acceptable range, push the dipstick back in all the
way; then flip the handle down to lock
the dipstick in place.
How to Add Automatic Transmission
Fluid
Refer to Recommended Fluids and Lubricants
0 255 to determine what kind of
transmission fluid to use.
1. WARM Range 2. HOT Range
Using a funnel, add fluid down the
transmission dipstick tube only after
checking the transmission fluid while it is
warm or hot. A cold check is used only as a
reference. If the fluid level is low, add only
enough of the proper fluid to bring the level
up to the middle of the WARM (1) or
HOT (2) range depending on the ambient
temperature and prior driving conditions.
Refer to
“How to Check Automatic
Transmission Fluid” earlier in this section for
instructions on driving to achieve warm or
hot transmission fluid. It does not take
much fluid, generally less than 0.5 L (1 pt).
Do not overfill.
Caution
Use of the incorrect automatic
transmission fluid may damage the
vehicle, and the damage may not be
covered by the vehicle warranty. Always
use the correct automatic transmission
fluid. See Recommended Fluids and
Lubricants 0255.