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5. Gradually release the brake pedalto allow the chocks to absorb the
load of the trailer.
6. Reapply the brake pedal. Then apply the parking brake and shift
into P (Park).
7. Release the brake pedal.
Pulling the Trailer from the Water 1. Press and hold the brake pedal.
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 of the chocks.
6. Stop and have someone pick up and store the chocks.
7. Slowly pull the trailer from the water.
8. Once the vehicle and trailer have been driven from the sloped part of
the boat ramp, the vehicle can be
shifted from four-wheel-drive high.
Shift into the drive mode that is
appropriate for the road conditions.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 0442. It is
especially important to check the
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
0 375.
Trailer Towing
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.

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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 system:1. Using the vehicle information screen controls on the right side of
the instrument cluster, display OIL
LIFE on the screen. See Vehicle
Information 0134. When remaining
oil life is low, the CHANGE
ENGINE OIL SOON message will
appear on the display.
2. Touch RESET on the screen to clear the CHANGE ENGINE OIL
SOON message and reset the oil life
at 100%.
Be careful not to reset the oil life
display accidentally at any time
other than after the oil is changed.
It cannot be reset accurately until
the next oil change.
The oil life system can also be reset as
follows: 1. Display OIL LIFE on the vehicle information screen. See Vehicle
Information 0134. 2. Fully press and release the
accelerator pedal three times
within five seconds.
If the CHANGE ENGINE OIL SOON
message is not on, the system is
reset.
The system is reset when the
CHANGE ENGINE OIL SOON message
is off.
If the CHANGE ENGINE OIL SOON
message comes back on when the
vehicle is started, the engine oil life
system has not been reset. Repeat the
procedure.
Automatic Transmission
Fluid
When to Check and Change
Automatic Transmission Fluid
If the vehicle has a diesel engine, see
the Duramax diesel supplement.
It is usually not necessary to check
the transmission fluid level. The only
reason for fluid loss is a transmission
leak or overheated transmission. This
vehicle is not equipped with a
transmission fluid level dipstick. There is a special procedure for
checking and changing the
transmission fluid in these vehicles.
Because this procedure is difficult,
this should be done at the dealer.
Contact the dealer for additional
information or the procedure can be
found in the service manual. See
Publication Ordering Information
0467.
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
0451.
Change the fluid and filter at the
scheduled maintenance intervals
listed in Maintenance Schedule 0442.
Be sure to use the transmission fluid
listed in Recommended Fluids and
Lubricants 0451.

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Engine Air Filter Life
System
If equipped, this feature provides the
engine air filter’s remaining life and
best timing for a change. The timing
to change an engine air filter depends
on driving and environmental
conditions.
When to Change the Engine Air
Filter
When the Driver Information Center
(DIC) displays a message to replace
the engine air filter at the next oil
change, follow this timing.
When the DIC displays a message to
replace the engine air filter soon,
replace the engine air filter at the
earliest convenience.
The system must be reset after the
engine air filter is changed.
If the DIC displays a message to check
the engine air filter system, see your
dealer.
How to Reset the Engine Air
Filter Life System
To reset:1. Place the vehicle in P (Park).
2. Access the Air Filter Life screen from the Vehicle Information main
screen in the infotainment system.
See Vehicle Information 0134 for
instructions on navigating and
selecting items.
3. Touch Reset on the display screen.
4. Touch Yes to confirm the reset.
Engine Air Cleaner/Filter
If the vehicle has a diesel engine, see
the Duramax diesel supplement. The engine air cleaner/filter is on the
driver side of the engine
compartment. See
Engine Compartment
Overview 0366.
When to Inspect the Engine Air
Cleaner/Filter
If the vehicle is not equipped with the
engine air filter life system see
Maintenance Schedule 0442 for
intervals on inspecting and replacing
the engine air cleaner filter.
How to Inspect/Replace the
Engine Air Cleaner/Filter
Do not start the engine or have the
engine running with the engine air
cleaner/filter housing open. Before
removing the engine air cleaner/filter,
make sure that the engine air cleaner/
filter housing and nearby components
are free of dirt and debris. Do not
clean the engine air cleaner/filter or
components with water or
compressed air.
To inspect or replace the engine air
cleaner/filter:

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the specified intervals to prevent
increased stopping distance. See
Maintenance Schedule0442.
What to Add
Use only GM approved DOT 4 brake
fluid from a clean, sealed container.
See Recommended Fluids and
Lubricants 0451.
{Warning
The wrong or contaminated brake
fluid could result in damage to the
brake system. This could result in
the loss of braking leading to a
possible injury. Always use the
proper GM approved brake fluid.
Caution
If brake fluid is spilled on the
vehicle's painted surfaces, the paint
finish can be damaged. Immediately
wash off any painted surface.
Battery - North America
The original equipment battery is
maintenance free. Do not remove the
cap and do not add fluid. Refer to the replacement number
shown on the original battery label
when a new battery is needed. See
Engine Compartment Overview
0366
for battery location.
{Warning
WARNING: Battery posts,
terminals, and related accessories
contain lead and lead compounds,
chemicals known to the State of
California to cause cancer and birth
defects or other reproductive harm.
Batteries also contain other
chemicals known to the State of
California to cause cancer. WASH
HANDS AFTER HANDLING. For
more information go to
www.P65Warnings.ca.gov/
passenger-vehicle.
See California Proposition 65 Warning
0 363 and the back cover.
Vehicle Storage
{Warning
Batteries have acid that can burn
you and gas that can explode. You
can be badly hurt if you are not
careful. See Jump Starting - North
America 0425 for tips on working
around a battery without
getting hurt.
Infrequent Usage: Remove the black,
negative (−) cable from the battery to
keep the battery from running down.
Extended Storage: Remove the black,
negative (−) cable from the battery or
use a battery trickle charger.
Four-Wheel Drive
Transfer Case
If the vehicle is equipped with
Four-Wheel Drive, be sure to perform
the lubricant checks described in this
section.

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VEHICLE CARE 381
When to Check Lubricant
Refer toMaintenance Schedule 0442
to determine how often to check the
lubricant.
How to Check Lubricant
To get an accurate reading, the vehicle
should be on a level surface.
1. Fill Plug
2. Drain Plug
If the level is below the bottom of the
fill plug (1) hole, located on the
transfer case, some lubricant will need
to be added. Add enough lubricant to raise the level to the bottom of the fill
plug (1) hole. Use care not to
overtighten the plug.
What to Use
Refer to
Recommended Fluids and
Lubricants 0451 to determine what
kind of lubricant to use.
Front Axle
When to Check Lubricant
It is not necessary to regularly check
the front axle fluid unless a leak is
suspected or an unusual noise is
heard. A fluid loss could indicate a
problem. Have it inspected and
repaired. This service can be complex.
See your dealer.
Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the fluid. Contaminated fluid will
decrease the life of the transfer case
and/or drive axles and should be
replaced.
Rear Axle
When to Check Lubricant
It is not necessary to regularly check
the rear axle fluid unless a leak is
suspected or an unusual noise is
heard. A fluid loss could indicate a
problem. Have it inspected and
repaired. This service can be complex.
See your dealer.
Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the fluid. Contaminated fluid will
decrease the life of the transfer case
and/or drive axles and should be
replaced.
Park Brake and P (Park)
Mechanism Check
{Warning
When you are doing this check, the
vehicle could begin to move. You or
others could be injured and
property could be damaged. Make
sure there is room in front of the
(Continued)

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Caution
Do not apply tape or hang any
objects from gas struts. Also do not
push down or pull on gas struts.
This may cause damage to the
vehicle.
See Maintenance Schedule 0442.
Hood
Trunk
Liftgate
Headlamp Aiming
Front Headlamp Aiming
Headlamp aim has been preset and
should need no further adjustment.
If the vehicle is damaged in a crash,
the headlamp aim may be affected.
If adjustment to the headlamps is
necessary, see your dealer.
Bulb Replacement
For the proper type of replacement
bulbs, or any bulb changing procedure
not listed in this section, contact your
dealer.
Caution
Do not replace incandescent bulbs
with aftermarket LED replacement
bulbs. This can cause damage to
the vehicle electrical system.
LED Lighting
This vehicle has several LED lamps.
For replacement of any LED lighting
assembly, contact your dealer.

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tire/wheel position after rotating the
tires or replacing one or more of the
TPMS sensors. When a tire is
installed, the vehicle must be
stationary for about 20 minutes before
the system recalculates. The following
relearn process takes up to
10 minutes, driving at a minimum
speed of 20 km/h (12 mph). A dash (-)
or pressure value will display in the
DIC. SeeDriver Information Center
(DIC) 0132. A warning message
displays in the DIC if a problem
occurs during the relearn process.
Tire Inspection
We recommend that the tires,
including the spare tire, if the
vehicle has one, be inspected for
signs of wear or damage at least
once a month.
Replace the tire if:
.The indicators at three or more
places around the tire can
be seen.
.There is cord or fabric showing
through the tire's rubber.
.The tread or sidewall is cracked,
cut, or snagged deep enough to
show cord or fabric.
.The tire has a bump, bulge,
or split.
.The tire has a puncture, cut,
or other damage that cannot be
repaired well because of the size
or location of the damage.
Tire Rotation
Tires should be rotated every
12 000 km (7,500 mi). See
Maintenance Schedule 0442.
Tires are rotated to achieve a
more uniform wear for all tires.
The first rotation is the most
important.
Anytime unusual wear is noticed,
rotate the tires as soon as
possible, check for proper tire
inflation pressure, and check for
damaged tires or wheels. If the
unusual wear continues after the
rotation, check the wheel alignment. See
When It Is Time for
New Tires 0407 and
Wheel Replacement 0411.
Use this rotation pattern when
rotating the tires.
Do not include the spare tire in
the tire rotation.
Adjust the front and rear tires to
the recommended inflation
pressure on the Tire and Loading
Information label after the tires
have been rotated. See Tire
Pressure 0400 and
Vehicle Load Limits 0240.

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2. Tilt the tire toward the vehicle.Separate the tire/wheel retainer
from the guide pin. Pull the pin
through the center of the wheel.
Tilt the retainer down through the
center wheel opening.
Make sure the retainer is fully
seated across the underside of the
wheel.
3. Assemble the jack handleextensions (4) and wheel
wrench (5).
Caution
Use of an air wrench or other power
tools with the hoist mechanism is
not recommended and could
damage the system. Use only the
tools supplied with the hoist
mechanism.
4. Insert the open end of theextension (7) through the hole in
the rear bumper (8) (hoist shaft
access hole).
5. Raise the tire part way upward. Make sure the retainer is seated in
the wheel opening. 6. Raise the tire fully against the
underside of the vehicle by turning
the wheel wrench clockwise until
you hear two clicks or feel it skip
twice. The cable cannot be
overtightened.
7. Make sure the tire is storedsecurely. Push, pull, and then try to
turn the tire. If the tire moves, use
the wheel wrench to tighten the
cable.
Repeat this tightness check
procedure when checking the spare
tire pressure according to the
scheduled maintenance