2011 GMC YUKON XL check engine light

Black plate (42,1)GMC Yukon/Yukon XL Owner Manual - 2011
5-42 Instruments and Controls
Fuel System Messages
FUEL LEVEL LOW
This message displays and a chime
sounds if the fuel level is low. Refuel
as soon as possible. SeeFuel
Gauge on page 5‑14 andFuel on
page 9‑68 for more information.
TIGHTEN GAS CAP
This message may display along
with the check engine light on the
instrument panel cluster if the fuel
cap is not tightened properly. See
Malfunction Indicator Lamp on
page 5‑21. Reinstall the fuel cap
fully. SeeFilling the Tank on
page 9‑72. The diagnostic system
can determine if the fuel cap has
been left off or improperly installed.
A loose or missing fuel cap
allows fuel to evaporate into the
atmosphere. A few driving trips with
the cap properly installed should
turn this light and message off.
Key and Lock Messages
REPLACE BATTERY IN
REMOTE KEY
This message displays if a Remote
Keyless Entry (RKE) transmitter
battery is low. The battery needs
to be replaced in the transmitter.
See “Battery Replacement” under
Remote Keyless Entry (RKE)
System Operation on page 2‑3.
Lamp Messages
TURN SIGNAL ON
This message displays and a chime
sounds if a turn signal is left on for
1.2 km (0.75 mile). Move the turn
signal/multifunction lever to the off
position.
Object Detection System
Messages
PARK ASST BLOCKED SEE
OWNERS MANUAL
If your vehicle has the Ultrasonic
Rear Parking Assist (URPA) system,
this message displays if there is
something interfering with the park
assist system. See Ultrasonic
Parking Assist on page 9‑58 for
more information.
PARK ASSIST OFF
If your vehicle has the Ultrasonic
Rear Parking Assist (URPA) system,
after the vehicle has been started,
this message displays to remind the
driver that the URPA system has
been turned off. Press the set/reset
button or the trip odometer reset
stem to acknowledge this message
and clear it from the DIC display.
To turn the URPA system back on,
see Ultrasonic Parking Assist on
page 9‑58.

Black plate (44,1)GMC Yukon/Yukon XL Owner Manual - 2011
5-44 Instruments and Controls
SERVICE SUSPENSION
SYSTEM
If your vehicle has the Autoride®
suspension system, this message
displays when the Autoride
suspension system is not operating
properly. Have your vehicle serviced
by your dealer.
SERVICE TRACTION
CONTROL
If your vehicle has StabiliTrak, this
message displays when there is a
problem with the Traction Control
System (TCS). When this message
displays, the system will not limit
wheel spin. Adjust your driving
accordingly. See your dealer for
service. SeeStabiliTrak
®System on
page 9‑52 for more information.
STABILITRAK OFF
If your vehicle has StabiliTrak, this
message displays when you turn
off StabiliTrak, or when the stability
control has been automatically
disabled. To limit wheel spin and realize the full benefits of the
stability enhancement system, you
should normally leave StabiliTrak
on. However, you should turn
StabiliTrak off if your vehicle gets
stuck in sand, mud, ice, or snow
and you want to rock your vehicle
to attempt to free it, or if you
are driving in extreme off-road
conditions and require more wheel
spin. See
If the Vehicle is Stuck on
page 9‑22. To turn the StabiliTrak
system on or off, see StabiliTrak
®
System on page 9‑52.
There are several conditions that
can cause this message to appear.
.One condition is overheating,
which could occur if StabiliTrak
activates continuously for an
extended period of time.
.The message also displays if
the brake system warning light is
on. SeeBrake System Warning
Light on page 5‑23.
.The message could display if the
stability system takes longer
than usual to complete its
diagnostic checks due to driving
conditions.
.The message displays if an
engine or vehicle related
problem has been detected
and the vehicle needs service.
See your dealer.
.The message also displays
if the vehicle is shifted into
4LO (Two Speed Transfer
Case Only).
The message turns off as soon
as the conditions that caused the
message to be displayed are no
longer present.
TRACTION CONTROL OFF
If your vehicle has StabiliTrak, this
message displays when the Traction
Control System (TCS) is turned off.
Adjust your driving accordingly. See
StabiliTrak
®System on page 9‑52
for more information.

Black plate (45,1)GMC Yukon/Yukon XL Owner Manual - 2011
Instruments and Controls 5-45
Airbag System Messages
SERVICE AIR BAG
This message displays if there is a
problem with the airbag system.
Have your dealer inspect the
system for problems. SeeAirbag
Readiness Light on page 5‑18 and
Airbag System on page 3‑39 for
more information.
Anti-Theft Alarm System
Messages
SERVICE THEFT DETERRENT
SYSTEM
This message displays when there
is a problem with the theft-deterrent
system. The vehicle may or may not
restart so you may want to take the
vehicle to your dealer before turning
off the engine. See Immobilizer
Operation on page 2‑16 for more
information.
Tire Messages
SERVICE TIRE MONITOR
SYSTEM
On vehicles with the Tire
Pressure Monitor System (TPMS),
this message displays if a part on
the TPMS is not working properly.
The tire pressure light also flashes
and then remains on during the
same ignition cycle. See Tire
Pressure Light on page 5‑26.
Several conditions may cause
this message to appear. See Tire
Pressure Monitor Operation on
page 10‑59 for more information.
If the warning comes on and stays
on, there may be a problem with the
TPMS. See your dealer.
TIRE LEARNING ACTIVE
On vehicles with the Tire Pressure
Monitor System (TPMS), this
message displays when the TPMS
is re-learning the tire positions on
your vehicle. The tire positions must
be re-learned after rotating the tires
or after replacing a tire or sensor. See
Tire Inspection on page 10‑62,
Tire Rotation on page 10‑62, Tire
Pressure Monitor System on
page 10‑58, and Tire Pressure on
page 10‑56 for more information.
TIRE LOW ADD AIR TO TIRE
On vehicles with the Tire Pressure
Monitor System (TPMS), this
message displays when the
pressure in one or more of the
vehicle's tires needs to be checked.
This message also displays LEFT
FRT (left front), RIGHT FRT
(right front), LEFT RR (left rear),
or RIGHT RR (right rear) to
indicate the location of the low
tire. The low tire pressure warning
light will also come on. See Tire
Pressure Light on page 5‑26.
You can receive more than one
tire pressure message at a time.
To read the other messages that
may have been sent at the same
time, press the set/reset button
or the trip odometer reset stem. If a
tire pressure message appears on
the DIC, stop as soon as you can.

Black plate (21,1)GMC Yukon/Yukon XL Owner Manual - 2011
Driving and Operating 9-21
WARNING (Continued)
If the vehicle is stuck in the snow:
.Clear away snow from around
the base of your vehicle,
especially any that is blocking
the exhaust pipe.
.Check again from time to
time to be sure snow does
not collect there.
.Open a window about 5 cm
(2 in) on the side of the
vehicle that is away from the
wind to bring in fresh air.
.Fully open the air outlets on
or under the instrument
panel.(Continued)
WARNING (Continued)
.Adjust the climate control
system to a setting that
circulates the air inside the
vehicle and set the fan speed
to the highest setting. See
Climate Control System in the
Index.
For more information about
carbon monoxide, see Engine
Exhaust on page 9‑36.
Snow can trap exhaust gases
under your vehicle. This can
cause deadly CO (Carbon
Monoxide) gas to get inside. CO
could overcome you and kill you.
You cannot see it or smell it, so
you might not know it is in your
vehicle. Clear away snow from
around the base of your vehicle,
especially any that is blocking the
exhaust. Run the engine for short periods
only as needed to keep warm, but
be careful.
To save fuel, run the engine for only
short periods as needed to warm
the vehicle and then shut the engine
off and close the window most of
the way to save heat. Repeat this
until help arrives but only when you
feel really uncomfortable from the
cold. Moving about to keep warm
also helps.
If it takes some time for help to
arrive, now and then when you run
the engine, push the accelerator
pedal slightly so the engine runs
faster than the idle speed. This
keeps the battery charged to restart
the vehicle and to signal for help
with the headlamps. Do this as little
as possible to save fuel.

Black plate (50,1)GMC Yukon/Yukon XL Owner Manual - 2011
9-50 Driving and Operating
Shifting Into Two-Wheel
Drive High
Turn the knob to the Two-Wheel
Drive High position. This can be
done at any speed. The indicator
light will flash while shifting. It
will remain on when the shift is
completed.
Excessively shifting the transfer
case into or out of the different
modes may cause the transfer case
to enter the shift protection mode.
This will protect the transfer case
from possible damage and will only
allow the transfer case to respond
to one shift per 10 seconds. The
transfer case may stay in this mode
for up to three minutes.Brakes
Antilock Brake
System (ABS)
This vehicle has the Antilock
Brake System (ABS), an advanced
electronic braking system that helps
prevent a braking skid.
When the engine is started and the
vehicle begins to drive away, ABS
checks itself. A momentary motor or
clicking noise might be heard while
this test is going on, and it might
even be noticed that the brake
pedal moves a little. This is normal.If there is a problem with ABS, this
warning light stays on. SeeAntilock
Brake System (ABS) Warning Light
on page 5‑24.
If driving safely on a wet road and
it becomes necessary to slam on
the brakes and continue braking
to avoid a sudden obstacle, a
computer senses that the wheels
are slowing down. If one of the
wheels is about to stop rolling, the
computer will separately work the
brakes at each wheel.
ABS can change the brake pressure
to each wheel, as required, faster
than any driver could. This can help
the driver steer around the obstacle
while braking hard.

Black plate (77,1)GMC Yukon/Yukon XL Owner Manual - 2011
Driving and Operating 9-77
Backing Up
Hold the bottom of the steering
wheel with one hand. Then, to move
the trailer to the left, move that hand
to the left. To move the trailer to the
right, move your hand to the right.
Always back up slowly and,
if possible, have someone
guide you.
Making Turns
Notice:Making very sharp turns
while trailering could cause the
trailer to come in contact with the
vehicle. The vehicle could be
damaged. Avoid making very
sharp turns while trailering.
When turning with a trailer, make
wider turns than normal. Do this
so the trailer will not strike soft
shoulders, curbs, road signs, trees
or other objects. Avoid jerky or
sudden maneuvers. Signal well in
advance. If the trailer turn signal bulbs burn
out, the arrows on the instrument
panel will still flash for turns. It is
important to check occasionally to
be sure the trailer bulbs are still
working.
Driving on Grades
Reduce speed and shift to a
lower gear
beforestarting down a
long or steep downgrade. If the
transmission is not shifted down,
the brakes might get hot and no
longer work well.
Vehicles can tow in D (Drive). Shift
the transmission to a lower gear if
the transmission shifts too often
under heavy loads and/or hilly
conditions. The tow/haul mode may be used if
the transmission shifts too often.
See
Tow/Haul Mode Light on
page 5‑25.
When towing at high altitude on
steep uphill grades, consider the
following: Engine coolant will boil at
a lower temperature than at normal
altitudes. If the engine is turned off
immediately after towing at high
altitude on steep uphill grades, the
vehicle may show signs similar to
engine overheating. To avoid this,
let the engine run while parked,
preferably on level ground, with the
automatic transmission in P (Park)
for a few minutes before turning the
engine off. If the overheat warning
comes on, see Engine Overheating
on page 10‑21.

Black plate (15,1)GMC Yukon/Yukon XL Owner Manual - 2011
Vehicle Care 10-15
Consistency of Readings
Always check the fluid level at least
twice using the procedure described
previously. Consistency (repeatable
readings) is important to maintaining
proper fluid level. If readings are still
inconsistent, contact the dealer.
Engine Air Cleaner/Filter
SeeEngine Compartment Overview
on page 10‑6 for the location of the
engine air cleaner/filter.
Inspect the air cleaner/filter
at the scheduled maintenance
intervals and replace it at the
first oil change after each 80 000 km
(50,000 mi) interval. See Scheduled
Maintenance on page 11‑2 for more
information. If driving on dusty/dirty
conditions, inspect the filter at each
engine oil change.
How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/filter,
remove the engine air cleaner/filter
from the vehicle by following
Steps 1 through 6. When the engine
air cleaner/filter is removed, lightly
shake it to release loose dust and
dirt. If the engine air cleaner/filter
remains covered with dirt, a
new filter is required. Never use
compressed air to clean the filter.
Replacing the Engine Air Cleaner/
Filter
1. Locate the air cleaner/filter
assembly . See Engine
Compartment Overview on
page 10‑6.
2. Loosen the four screws on the cover of the housing and lift up
the cover.

Black plate (27,1)GMC Yukon/Yukon XL Owner Manual - 2011
Vehicle Care 10-27
Brake Fluid
The brake master cylinder reservoir
is filled with DOT 3 brake fluid. See
Engine Compartment Overview on
page 10‑6for the location of the
reservoir.
There are only two reasons why the
brake fluid level in the reservoir
might go down:
.The brake fluid level goes down
because of normal brake lining
wear. When new linings are
installed, the fluid level goes
back up.
.A fluid leak in the brake
hydraulic system can also cause
a low fluid level. Have the brake
hydraulic system fixed, since a
leak means that sooner or later
the brakes will not work well. Do not top off the brake fluid.
Adding fluid does not correct a
leak. If fluid is added when the
linings are worn, there will be too
much fluid when new brake linings
are installed. Add or remove brake
fluid, as necessary, only when work
is done on the brake hydraulic
system.
{WARNING
If too much brake fluid is added, it
can spill on the engine and burn,
if the engine is hot enough. You
or others could be burned, and
the vehicle could be damaged.
Add brake fluid only when work
is done on the brake hydraulic
system. See
“Checking Brake
Fluid” in this section.
When the brake fluid falls to a low
level, the brake warning light comes
on. See Brake System Warning
Light on page 5‑23. Refer to the Maintenance Schedule
to determine when to check the
brake fluid. See
Scheduled
Maintenance on page 11‑2.
Checking Brake Fluid
Check brake fluid by looking at the
brake fluid reservoir. See Engine
Compartment Overview on
page 10‑6.
The fluid level should be above
MIN. If it is not, have the brake
hydraulic system checked to see if
there is a leak.