2011 GMC YUKON service

Black plate (52,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-52 Driving and Operating
Brake Assist
This vehicle has a brake assist
feature designed to assist the
driver in stopping or decreasing
vehicle speed in emergency driving
conditions. This feature uses the
stability system hydraulic brake
control module to supplement
the power brake system under
conditions where the driver has
quickly and forcefully applied the
brake pedal in an attempt to quickly
stop or slow down the vehicle. The
stability system hydraulic brake
control module increases brake
pressure at each corner of the
vehicle until the ABS activates.
Minor brake pedal pulsation or
pedal movement during this time
is normal and the driver should
continue to apply the brake pedal
as the driving situation dictates.
The brake assist feature will
automatically disengage when
the brake pedal is released or
brake pedal pressure is quickly
decreased.
Ride Control Systems
StabiliTrak®System
The vehicle has a vehicle stability
enhancement system called
StabiliTrak. It is an advanced
computer-controlled system that
assists the driver with directional
control of the vehicle in difficult
driving conditions.
StabiliTrak activates when the
computer senses a discrepancy
between the intended path and the
direction the vehicle is actually
traveling. StabiliTrak selectively
applies braking pressure at any one
of the vehicle's brakes to assist the
driver with keeping the vehicle on
the intended path.
When the vehicle is started and
begins to move, the system
performs several diagnostic checks
to insure there are no problems.
The system may be heard or felt
while it is working. This is normal
and does not mean there is a
problem with the vehicle.The system should initialize before
the vehicle reaches 32 km/h
(20 mph). In some cases, it may
take approximately 3.2 km (2 mi) of
driving before the system initializes.
If cruise control is being used
when StabiliTrak activates, the
cruise control automatically
disengages. The cruise control
can be re-engaged when road
conditions allow. See
Cruise Control
on page 9‑56.
If the system fails to turn on or
activate, the StabiliTrak light
along with one of the following
messages will be displayed on the
Driver Information Center (DIC):
TRACTION CONTROL OFF,
SERVICE TRACTION CONTROL,
STABILITRAK OFF, SERVICE
STABILITRAK. If these DIC
messages appear, make sure
the StabiliTrak system has not been
turned off using the StabiliTrak
on/off button. Then turn the vehicle
off, wait 15 seconds, and then turn it
back on again to reset the system.

Black plate (53,1)GMC Yukon/Yukon XL Owner Manual - 2011
Driving and Operating 9-53
If any of these messages still
appear on the Driver Information
Center (DIC), the vehicle should
be taken in for service. For more
information on the DIC messages,
seeDriver Information Center (DIC)
on page 5‑28.
The StabiliTrak light will flash on the
instrument panel cluster when the
system is both on and activated.
The system may be heard or felt
while it is working; this is normal.
The traction control disable button is
located on the instrument panel.
The traction control part of
StabiliTrak can be turned off
by pressing and releasing the
StabiliTrak button if both systems
(traction control and StabiliTrak)
were previously on. To disable both
TCS and StabiliTrak, press and
hold
5untilFilluminates and the
appropriate DIC message displays.
Traction control and StabiliTrak
can be turned on by pressing and
releasing the StabiliTrak button if
they are not automatically shut off
for any other reason. When the traction control system
(TCS) or StabiliTrak system is
turned off, the StabiliTrak light
and the appropriate TCS off or
StabiliTrak off message will be
displayed on the DIC to warn the
driver. The vehicle will still have
brake-traction control when traction
control is off, but will not be able to
use the engine speed management
system. See
“Traction Control
Operation” next for more
information.
When the traction control system
has been turned off, system noises
may still be heard as a result of the
brake-traction control coming on.

Black plate (54,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-54 Driving and Operating
It is recommended to leave the
system on for normal driving
conditions, but it may be necessary
to turn the system off if the vehicle
is stuck in sand, mud, ice or snow,
and you want to“rock”the vehicle
to attempt to free it. It may also be
necessary to turn off the system
when driving in extreme off-road
conditions where high wheel spin is
required. See If the Vehicle is Stuck
on page 9‑22.
When the transfer case is in 4LO,
the stability system is automatically
disabled, the StabiliTrak light comes
on, and the STABILITRAK OFF
message will appear on the DIC.
Both traction control and StabiliTrak
are automatically disabled in this
condition.
Traction Control Operation
The traction control system is
part of the StabiliTrak system.
Traction control limits wheel spin
by reducing engine power to the
wheels (engine speed management) and by applying brakes to each
individual wheel (brake-traction
control) as necessary.
The traction control system is
enabled automatically when the
vehicle is started. It will activate and
the StabiliTrak light will flash if it
senses that any of the wheels are
spinning or beginning to lose
traction while driving. If traction
control is turned off, only the
brake-traction control portion of
traction control will work. The
engine speed management will
be disabled. In this mode, engine
power is not reduced automatically
and the driven wheels can spin
more freely. This can cause the
brake-traction control to activate
constantly.
Notice:
If the wheel(s) of one axle
is allowed to spin excessively
while the StabiliTrak®, ABS, brake
warning lights, and any relevant
DIC messages are displayed, the
transfer case could be damaged.
The repairs would not be covered
by the vehicle warranty. Reduce engine power and do not spin
the wheel(s) excessively while
these lights and messages are
displayed.
The traction control system may
activate on dry or rough roads or
under conditions such as heavy
acceleration while turning or
abrupt upshifts/downshifts of the
transmission. When this happens,
a reduction in acceleration may be
noticed, or a noise or vibration may
be heard. This is normal.
If cruise control is being used when
the system activates, the StabiliTrak
light will flash and cruise control will
automatically disengage. Cruise
control may be reengaged when
road conditions allow. See
Cruise
Control on page 9‑56.
StabiliTrak may also turn off
automatically if it determines that
a problem exists with the system.
If the problem does not clear itself
after restarting the vehicle, see your
dealer for service.

Black plate (59,1)GMC Yukon/Yukon XL Owner Manual - 2011
Driving and Operating 9-59
How the System Works
URPA comes on automatically
when the shift lever is moved into
R (Reverse). A single tone sounds
to indicate the system is working.
URPA operates only at speeds less
than 5 mph (8 km/h).
An obstacle is indicated by audible
beeps. The interval between the
beeps becomes shorter as the
vehicle gets closer to the obstacle.
When the distance is less than
30 cm (12 in) the beeps are
continuous.
To be detected, objects must be at
least 25.4 cm (10 in) off the ground
and below liftgate level. Objects
must also be within 2.5 m (8 ft) from
the rear bumper. This distance may
be less during warmer or humid
weather.
The system can be disabled by
pressing the rear park aid disable
button located next to the radio.
The indicator light will come on and
PARK ASSIST OFF displays on the
Driver Information Center (DIC) to
indicate that URPA is off, seeObject
Detection System Messages on
page 5‑42.
When the System Does Not
Seem to Work Properly
If the URPA system will not activate
due to a temporary condition, the
messages PARK ASSIST OFF
or PARK ASST BLOCKED SEE
OWNERS MANUAL will be
displayed on the DIC.
SERVICE PARK ASSIST: If this
message occurs, take the vehicle to
your dealer to repair the system. PARK ASSIST OFF:
This message
occurs if the driver disables the
system.
PARK ASST BLOCKED SEE
OWNERS MANUAL: This
message can occur under the
following conditions:
.The ultrasonic sensors are not
clean. Keep the vehicle's rear
bumper free of mud, dirt, snow,
ice and slush. For cleaning
instructions, see “Washing the
Vehicle” underExterior Care on
page 10‑98.
.The park assist sensors are
covered by frost or ice. Frost or
ice can form around and behind
the sensors and may not always
be seen; this can occur after
washing the vehicle in cold
weather. The message may not
clear until the frost or ice has
melted.

Black plate (61,1)GMC Yukon/Yukon XL Owner Manual - 2011
Driving and Operating 9-61
Use caution while changing lanes
when towing a trailer, as the SBZA
detection zones do not change
when a trailer is towed.
How the System Works
Left Side MirrorDisplayRight Side Mirror Display
When the vehicle is started, both
outside mirror displays will briefly
come on to indicate that the system
is operating. When the vehicle is
moving forward, the left or right side
mirror SBZA display will light up if
a vehicle is detected in that blind
zone. If the turn signal is activated
and a vehicle is also detected on
the same side, the SBZA display will
flash to give you extra warning not
to change lanes. SBZA displays do not come on
while the vehicle is approaching or
passing other vehicles. At speeds
greater then 32 km/h (20 mph),
SBZA displays may come on
when a vehicle you have passed
remains in or drops back into the
detection zone.
SBZA can be disabled through the
Driver Information Center (DIC).
See
Driver Information Center (DIC)
on page 5‑28 for more information.
If the SBZA is disabled by the
driver, the SBZA mirror displays will
not light up during normal driving.
When the System Does Not Seem
To Work Properly
Occasional missed alerts can
occur under normal circumstances
and will increase in wet conditions.
The system does not need to be
serviced due to an occasional
missed alert. The number of missed
alerts will increase with increased
rainfall or road spray. If the SBZA displays do not light up
when the system is on and vehicles
are in the blind zone, the system
may need service. Take the vehicle
to your dealer.
SBZA is designed to ignore
stationary objects; however, the
system may occasionally light up
due to guard rails, signs, trees,
shrubs, and other stationary objects.
This is normal system operation, the
vehicle does not need service.
SBZA does not operate when the
left or right corners of the rear
bumper are covered with mud,
dirt, snow, ice, slush, or in
heavy rainstorms. For cleaning
instructions, see
“Washing the
Vehicle” underExterior Care on
page 10‑98. If the DIC still displays
the SIDE BLIND ZONE SYS.
UNAVAILABLE message after
cleaning the bumper, see your
dealer.

Black plate (62,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-62 Driving and Operating
The SBZA displays may remain on
if a trailer is attached to the vehicle,
or a bicycle or object is extending
out to either side of the vehicle.
When SBZA is disabled for any
reason other than the driver turning
it off, the driver will not be able to
turn SBZA back on using the DIC.
The SIDE BLIND ZONE ALERT
ON option will not be selectable if
the conditions for normal system
operation are not met. Until normal
operating conditions for SBZA are
met, you should not rely upon SBZA
while driving.
SBZA Error Messages
The following messages may
appear in the DIC:
SIDE BLIND ZONE ALERT
SYSTEM OFF:This message
indicates that the driver has turned
the system off. SIDE BLIND ZONE SYS.
UNAVAILABLE:
This message
indicates that the SBZA system is
disabled either because the sensor
is blocked and cannot detect
vehicles in your blind zone, or the
vehicle is passing through an open
field of view area, such as the
desert, where there is insufficient
data for operation. The sensor may
be blocked by mud, dirt, snow, ice,
slush, or even heavy rainstorms.
This message may also activate
during heavy rain or due to road
spray. The vehicle does not need
service. For cleaning, see “Washing
the Vehicle” underExterior Care on
page 10‑98.
SERVICE SIDE BLIND ZONE
ALERT SYSTEM: If this message
appears, both SBZA displays will
remain on indicating there is a
problem with the SBZA system.
If these displays remain on after
continued driving, the system needs
service. Take the vehicle to your
dealer.FCC Information
See Radio Frequency Statement on
page 13‑16 for information
regarding Part 15 of the Federal
Communications Commission (FCC)
rules and Industry Canada
Standards RSS-210/220/310.
Frequency of operation:
24.05GHz –24.25GHz
Field Strength: Not greater than
2.5V/m peak (0.25V/m average) at a
distance of 3m
The manufacturer is not
responsible for any radio or
TV interference caused by
unauthorized modifications to this
equipment. Such modifications
could void the user's authority to
operate the equipment.

Black plate (66,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-66 Driving and Operating
Rear Vision Camera Error
Messages
Service Rear Vision Camera
System:This message can display
when the system is not receiving
information it requires from other
vehicle systems.
If any other problem occurs or if a
problem persists, see your dealer.
Rear Vision Camera Location
The image is provided by the
camera located above the license
plate. The camera uses a special lens.
The distance of the image that
appears on the screen differs
from the actual distance. The area
displayed by the camera is limited.
The camera does not display
objects which are close to either
corner of the bumper or under the
bumper. The area displayed on the
screen can vary according to
vehicle orientation or road
conditions.
The following illustration shows
the field of view that the camera
provides.A. View displayed by the camera.
B. Corner of the rear bumper.

Black plate (68,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-68 Driving and Operating
Fuel
Use of the recommended fuel is
an important part of the proper
maintenance of this vehicle. To help
keep the engine clean and maintain
optimum vehicle performance, we
recommend the use of gasoline
advertised as TOP TIER Detergent
Gasoline.
Look for the TOP TIER label on the
fuel pump to ensure gasoline meets
enhanced detergency standards
developed by auto companies. A list
of marketers providing TOP TIER
Detergent Gasoline can be found at
www.toptiergas.com.
The eighth digit of the Vehicle
Identification Number (VIN) shows
the code letter or number that
identifies the vehicle's engine.
The VIN is at the top left of the
instrument panel. SeeVehicle
Identification Number (VIN) on
page 12‑1. Vehicles that have a FlexFuel badge
and a yellow fuel cap can use either
unleaded gasoline or ethanol fuel
containing up to 85% ethanol (E85).
See
Fuel E85 (85% Ethanol) on
page 9‑70. For all other vehicles,
use only the unleaded gasoline
described under Recommended
Fuel on page 9‑68.
Recommended Fuel
Use regular unleaded gasoline with
a posted octane rating of 87 or
higher. If the octane rating is less
than 87, an audible knocking noise,
commonly referred to as spark
knock, might be heard when driving.
If this occurs, use a gasoline rated
at 87 octane or higher as soon
as possible. If heavy knocking is
heard when using gasoline rated
at 87 octane or higher, the engine
needs service.