2014 GMC YUKON ECU

Black plate (18,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-18 Vehicle Care
6. Verify coolant level after engineis shut off and the coolant is
cold. If necessary, repeat coolant
fill procedure Steps 1–6.
Notice: If the pressure cap is not
tightly installed, coolant loss and
possible engine damage may
occur. Be sure the cap is properly
and tightly secured.
Engine Overheating
The vehicle has several indicators
to warn of engine overheating.
There is a coolant temperature
gauge on your vehicle's instrument
panel. See Engine Coolant
Temperature Gauge on page 5-14.
In addition, ENGINE OVERHEATED
STOP ENGINE, ENGINE
OVERHEATED IDLE ENGINE, and
an ENGINE POWER IS REDUCED
message comes on in the Driver
Information Center (DIC) on the
instrument panel. See Engine
Cooling System Messages on
page 5-36 andEngine Power
Messages on page 5-37. If the decision is made not to lift the
hood when this warning appears,
but instead get service help right
away. See
Roadside Assistance
Program on page 13-5.
If the decision is made to lift the
hood, make sure the vehicle is
parked on a level surface.
Then check to see if the engine
cooling fans are running. If the
engine is overheating, both fans
should be running. If they are not,
do not continue to run the engine
and have the vehicle serviced.
Notice: Running the engine
without coolant may cause
damage or a fire. Vehicle damage
would not be covered by the
warranty. See Overheated Engine
Protection Operating Mode on
page 10-19 for information on
driving to a safe place in an
emergency.
If Steam Is Coming from the
Engine Compartment
{Warning
Steam from an overheated engine
can burn you badly, even if you
just open the hood. Stay away
from the engine if you see or hear
steam coming from it. Turn it off
and get everyone away from the
vehicle until it cools down. Wait
until there is no sign of steam or
coolant before you open
the hood.
If you keep driving when the
vehicles engine is overheated,
the liquids in it can catch fire. You
or others could be badly burned.
Stop the engine if it overheats,
and get out of the vehicle until the
engine is cool.
(Continued)

Black plate (61,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
Vehicle Care 10-61
Warning (Continued)
or other vehicle parts. The area
damaged by the tire chains could
cause loss of control and a crash.
Use another type of traction
device only if its manufacturer
recommends it for the vehicle's
tire size combination and road
conditions. Follow that
manufacturer's instructions. To
avoid vehicle damage, drive slow
and readjust or remove the
traction device if it is contacting
the vehicle. Do not spin the
wheels.
If traction devices are used, install
them on the rear tires.
Notice: If the vehicle has P265/
70R17 size tires, use tire chains
only where legal and only when
necessary. Use chains that are
the proper size for the tires.
Install them on the rear tires only. Do not use chains on the front
tires.
Tighten them as tightly as
possible with the ends securely
fastened. Drive slowly and follow
the chain manufacturer's
instructions. If the chains contact
the vehicle, stop and retighten
them. If the contact continues,
slow down until it stops. Driving
too fast or spinning the wheels
with chains on will damage the
vehicle.
If a Tire Goes Flat
It is unusual for a tire to blowout
while driving, especially if the tires
are maintained properly. If air goes
out of a tire, it is much more likely to
leak out slowly. But if there ever is a
blowout, here are a few tips about
what to expect and what to do:
If a front tire fails, the flat tire
creates a drag that pulls the vehicle
toward that side. Take your foot off
the accelerator pedal and grip the
steering wheel firmly. Steer tomaintain lane position, and then
gently brake to a stop, well off the
road, if possible.
A rear blowout, particularly on a
curve, acts much like a skid and
may require the same correction as
used in a skid. Stop pressing the
accelerator pedal and steer to
straighten the vehicle. It may be
very bumpy and noisy. Gently brake
to a stop, well off the road,
if possible.
{Warning
Driving on a flat tire will cause
permanent damage to the tire.
Re-inflating a tire after it has been
driven on while severely
underinflated or flat may cause a
blowout and a serious crash.
Never attempt to re-inflate a tire
that has been driven on while
severely underinflated or flat.
Have your dealer or an authorized
(Continued)

Black plate (71,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
Vehicle Care 10-71
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 two jack handle
extensions (D) and wheel
wrench (E) as shown.
4. Insert the open end of theextension (J) through the hole in
the rear bumper (I) (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 (A), and then
try to turn (B) the tire. If the tire
moves, use the wheel wrench to
tighten the cable.
8. Reinstall the spare tire lock.
9. Reinstall the hoist shaft access cover.

Black plate (72,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-72 Vehicle Care
To store the tools, do the following:
A. Wheel Blocks
B. Tool Bag with Jack Tools
C. Retaining Bracket
D. Wing Nut Retaining Tool Bag
E. Jack
F. Wing Nut Retaining WheelBlocks
G. Jack Knob
1. Return the tools (wheel wrench, jack handle, and jack handle
extensions) to the tool bag (B). 2. Assemble wheel blocks (A) and
jack (E) together with the
wing nut (F).
3. Position the jack (E) and wheel blocks (A) in the driver side trim
panel over the wheelhouse.
4. Turn the jack knob (G) clockwise until the jack (E) is secured tight
in the mounting bracket. Be sure
to position the holes in the base
of the jack (E) onto the pin in the
mounting bracket.
5. Use the retaining bracket (C) to fasten the tool bag (B) on the
stud and turn the wing nut (D)
clockwise to secure.
6. Return the storage tray to itsoriginal stored position.
Secondary Latch System
This vehicle has an
underbody-mounted tire hoist
assembly equipped with a
secondary latch system. It is
designed to stop the spare tire from
suddenly falling off your vehicle. For
the secondary latch to work, the
spare must be installed with the
valve stem pointing down.

Black plate (74,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-74 Vehicle Care
A. Jack
B. Wheel Blocks
7. Place the bottom edge of the jack (A) on the wheel blocks (B),
separating them so that the jack
is balanced securely.
8. Attach the jack handle,extension, and wheel wrench to
the jack and place it (with the
wheel blocks) under the vehicle
toward the front of the rear
bumper.
9. Position the center lift point ofthe jack under the center of the
spare tire. 10. Turn the wrench clockwise to
raise the jack until it lifts the
end fitting.
11. Continue raising the jack until the spare tire stops moving
upward and is held firmly in
place. The secondary latch has
released and the spare tire is
balancing on the jack.
12. Lower the jack by turning the wheel wrench
counterclockwise. Keep
lowering the jack until the
spare tire slides off the jack or
is hanging by the cable.
{Warning
Someone standing too close
during the procedure could be
injured by the jack. If the spare
tire does not slide off the jack
completely, make sure no one is
behind you or on either side of
you as you pull the jack out from
under the spare.

Black plate (80,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-80 Vehicle Care
Jumper Cable Removal
A. Heavy, Unpainted Metal Engine Part or Remote Negative (−)
Terminal
B. Good Battery or Remote Positive (+) and Remote
Negative (−) Terminals
C. Dead Battery or Remote Positive (+) Terminal
To disconnect the jumper cables
from both vehicles do the following:
1. Disconnect the black negative (−) cable from the
vehicle that had the bad battery. 2. Disconnect the black
negative (−) cable from the
vehicle with the good battery.
3. Disconnect the red positive (+) cable from the vehicle with the
good battery.
4. Disconnect the red positive (+) cable from the other vehicle.
5. Return the remote positive (+) terminal cover, if the vehicle has
one, to its original position.
Towing
Towing the Vehicle
Notice: Incorrectly towing a
disabled vehicle may cause
damage. The damage would not
be covered by the vehicle
warranty. Do not lash or hook to
the chassis components
including the front and rear
subframes, suspension control
arms and links during towing and
recovery of a disabled vehicle or
to secure the vehicle to a flatbed
car carrier. Use the proper nylon
strap harnesses around the tires
to secure the flatbed car carrier.
Have the vehicle towed on a flatbed
car carrier or a wheel lift tow truck.
If a wheel lift tow truck is used, the
drive wheels cannot contact the
road while the vehicle is being
towed. A wheel dolly must be used
to lift all drive wheels off the ground.
Consult your dealer or a
professional towing service if the
disabled vehicle must be towed.

Black plate (82,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-82 Vehicle Care
Two-wheel-drive vehicles and
four-wheel drive vehicles with a
single speed automatic transfer
case should not be towed with all
four wheels on the ground.
Two-wheel-drive transmissions have
no provisions for internal lubrication
while being towed. Four-wheel drive
vehicles with a single speed
automatic transfer case have no
neutral position and will spin the
transmission when the rear
wheels turn.Four-Wheel Drive Vehicles with a
Two Speed Automatic
Transfer Case
Use the following procedure to
dinghy tow a four-wheel drive
vehicle with a two speed automatic
transfer case:
1. Position the vehicle being towed
behind the tow vehicle and shift
the transmission to P (Park).
2. Turn the engine off and firmly set the parking brake.
3. Securely attach the vehicle being towed to the tow vehicle.
{Warning
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). The driver or others
could be injured. Make sure the
parking brake is firmly set before
the transfer case is shifted to
N (Neutral).
4. Shift the transfer case to N (Neutral). See See
Four-Wheel Drive (Single Speed
Automatic Transfer Case) on
page 9-37 orFour-Wheel Drive
(Two Speed Automatic Transfer
Case) on page 9-33.
5. Release the parking brake only after the vehicle being towed is
firmly attached to the towing
vehicle.
6. Turn the ignition to LOCK/OFF and remove the key —the
steering wheel will still turn.

Black plate (84,1)GMC Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada-
6081505) - 2014 - crc - 4/23/13
10-84 Vehicle Care
2. Drive the front wheels onto thedolly.
3. Shift the transmission to P (Park).
4. Firmly set the parking brake.
{Warning
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). The driver or others
could be injured. Make sure the
parking brake is firmly set before
the transfer case is shifted to
N (Neutral).
5. Use an adequate clamping device designed for towing to
ensure that the front wheels are
locked into the straight position. 6. Shift the transfer case to
N (Neutral). See Four-Wheel
Drive (Single Speed Automatic
Transfer Case) on page 9-37 or
Four-Wheel Drive (Two Speed
Automatic Transfer Case) on
page 9-33.
7. Secure the vehicle to the dolly following the manufacturer's
instructions.
8. Release the parking brake only after the vehicle being towed is
firmly attached to the towing
vehicle.
9. Turn the ignition to LOCK/OFF.
After towing, see “Shifting Out of
N (Neutral)” underFour-Wheel Drive
(Single Speed Automatic Transfer
Case) on page 9-37 orFour-Wheel
Drive (Two Speed Automatic
Transfer Case) on page 9-33.
Rear Towing (Rear Wheels Off
the Ground)
Two-Wheel-Drive Vehicles and
Four-Wheel Drive Vehicles with a
Single Speed Automatic
Transfer Case
Use the following procedure to dolly
tow the vehicle from the rear:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the rear wheels onto the dolly.