2009 GMC YUKON HYBRID service

Seats and Restraint System............................. 1-1
Front Seats ............................................... 1-2
Restraint System Check .............................. 1-3
Features and Controls ..................................... 2-1
Storage Areas ........................................... 2-2
Starting and Operating Your Vehicle ............. 2-3
Instrument Panel ............................................. 3-1
Climate Controls ........................................ 3-2
Warning Lights, Gages, and Indicators .......... 3-3
Driver Information Center (DIC) ..................3-12
Audio System(s) ....................................... 3-14Driving Your Vehicle
....................................... 4-1
Your Driving, the Road, and the Vehicle ....... 4-2
Towing ..................................................... 4-2
Service and Appearance Care .......................... 5-1
Service ..................................................... 5-2
Checking Things Under the Hood ................. 5-3
Bulb Replacement .................................... 5-21
Electrical System ...................................... 5-22
Tires ...................................................... 5-24
Capacities and Specifications .....................5-52
Maintenance Schedule ..................................... 6-1
Maintenance Schedule ................................ 6-2
Index ............................................................
....
1
2009 Chevrolet Tahoe and GMC Yukon Two-Mode HybridM

Manual Reclining Seatbacks
To recline the seatback:
1. Lift the reclining seatback lever (C).
2. Move the seatback to the desired position, then
release the lever to lock the seatback in place.
3. Push and pull on the seatback to make sure it is
locked.
To return the seatback to an upright position:
1. Lift the lever fully without applying pressure to the
seatback and the seatback will return to the upright
position.
2. Release the lever to lock the seatback in place.
3. Push and pull on the seatback to make sure
it is locked.
Restraint System Check
Replacing Restraint System Parts
After a Crash
If an airbag inflates or the vehicle has been in a crash,
the vehicle’s sensing system may command the
automatic hybrid battery disconnect to open. The battery
will disconnect. The hybrid battery will be off and the
vehicle will not start. The airbag readiness light and/or
SERVICE HYBRID SYSTEM message may come
on in the driver information center. See “Airbag
Readiness Light” in the owner manual andDriver
Information Center (DIC) on page 3-12for more
information.
To operate the vehicle, the automatic hybrid battery
disconnect must be reconnected by a qualified service
technician and sensing system parts will need to be
replaced. Have the vehicle serviced right away.
1-3

Brake System Warning Light
With the ignition in ON/RUN, the brake system warning
light comes on when the parking brake is set. If the
vehicle is driven with the parking brake engaged,
a chime sounds when the vehicle speed is greater than
5 mph (8 km/h).
The vehicle’s hydraulic brake system is divided into
two parts. If one part is not working, the other part can
still work and stop the vehicle. For good braking,
though, both parts need to be working well.
If the warning light comes on and a chime sounds there
could be a brake problem. Have the brake system
inspected right away.
This light also comes on due to low brake fluid. See the
owner manual for more information.This light should come on briefly when the ignition key
is turned to ON/RUN. If it does not come on then,
have it fixed so it will be ready to warn if there is a
problem.
{CAUTION:
The brake system might not be working properly if
the brake system warning light is on. Driving with
the brake system warning light on can lead to a
crash. If the light is still on after the vehicle has
been pulled off the road and carefully stopped,
have the vehicle towed for service.
If the light comes on while driving, pull off the road and
stop carefully. The pedal might be harder to push or
can go closer to the floor. It may take longer to stop.
If the light does not go out, have the vehicle towed for
service. SeeTowing Your Vehicle on page 4-2.
United States
Canada
3-6

Antilock Brake System (ABS)
Warning Light
For vehicles with the
Antilock Brake System
(ABS), this light comes on
briefly when the engine
is in ON/RUN.
That is normal. If the light does not come on then, have
it fixed so it will be ready to warn if there is a problem.
If the ABS light stays on, turn the ignition off, if the light
comes on while driving, stop as soon as it is safely
possible and turn the ignition off. Then start the engine
again to reset the system. If the ABS light still stays
on, or comes on again while driving, the vehicle needs
service. If the regular brake system warning light is
not on, the vehicle still has brakes, but not antilock
brakes. If the regular brake system warning light is
also on, the vehicle does not have antilock brakes
and there is a problem with the regular brakes.
SeeBrake System Warning Light on page 3-6.
For vehicles with a Driver Information Center (DIC),
seeDIC Warnings and Messages on page 3-12for all
brake related DIC messages.
StabiliTrak®Indicator Light
For vehicles with
StabiliTrak, this warning
light comes on briefly when
the ignition is in ON/RUN.
If it does not, have the vehicle serviced by your
dealer/retailer. If the system is working normally the
indicator light goes off.
When this light flashes, the system is on.
If it stays on while driving, there may be a problem with
the StabiliTrak system and the vehicle may need
service. See the owner manual for more information.
3-7

A reading in the low pressure zone may be caused by
a dangerously low oil level or some other problem
causing low oil pressure. Check the oil as soon
as possible.
{CAUTION:
Do not keep driving if the oil pressure is low.
The engine can become so hot that it catches fire.
Someone could be burned. Check the oil as soon
as possible and have the vehicle serviced.
Notice:Lack of proper engine oil maintenance can
damage the engine. The repairs would not be
covered by the vehicle warranty. Always follow the
maintenance schedule in this manual for changing
engine oil.
AUTO STOP
When the engine goes into Automatic Engine Stop, the
oil pressure gage drops to zero when the tachometer
is at the AUTO STOP position. This is normal and
oil pressure returns to the normal operating range once
the engine starts.
SeeStarting the Vehicle on page 2-3for more
information.
AUTO STOP displays in the Driver Information
Center (DIC) when the vehicle speed is zero.
SeeDIC Warnings and Messages on page 3-12
for more information.
3-9

Oil Pressure Light
{CAUTION:
Do not keep driving if the oil pressure is low.
The engine can become so hot that it catches fire.
Someone could be burned. Check the oil as soon
as possible and have the vehicle serviced.
Notice:Lack of proper engine oil maintenance can
damage the engine. The repairs would not be
covered by the vehicle warranty. Always follow the
maintenance schedule in this manual for changing
engine oil.This light comes on briefly
as a check it works, when
the ignition is in ON/RUN.
If it does not, have the
vehicle serviced.
If the light comes on and stays on, it means that oil is
not flowing through the engine properly. The vehicle
could be low on oil and might have some other system
problem.
During an AUTO STOP there is zero oil pressure, but
this light will not come on.
3-10

SERVICE BATTERY CHARGING
SYSTEM
If the hybrid battery system faults or fails this message
will appear on the DIC. The engine auto stop feature
will be disabled and the battery/charging system light will
appear in the instrument panel cluster. See “Battery
Warning Light” in the owner manual Index.
Driving with this light on could drain your batteries.
Have the electrical system checked as soon as possible.
Pressing the select button or the trip odometer reset
stem on the instrument panel cluster will acknowledge
this message and clear it from the DIC display.
HOOD OPEN
If the hood is not fully closed or there is a problem
with the hood switch, this message will be displayed.
Close the hood to clear the message. If the HOOD
OPEN message continues to be displayed after
verifying the hood is closed, you should have the hood
switch serviced. Pressing the select button or the
trip odometer reset stem on the instrument panel cluster
will acknowledge this message and clear it from the
DIC display.
When this message is displayed, the auto stop
function will not operate. If the vehicle is in auto stop
mode when this message appears, the engine will
instantly start.
OIL PRESSURE LOW STOP ENGINE
If engine oil pressure is low, this message will be
displayed on the DIC. Stop the vehicle as soon as safely
possible and do not operate it until the cause of the
low oil pressure has been corrected. Check your oil level
as soon as possible and have your vehicle serviced.
See “Engine Oil” in the owner manual Index.
SERVICE BRAKE SYSTEM
This message will be displayed if there is a problem
with the brake system. You will still be able to brake, but
it will be noticeably more difficult. Pull off the road to a
safe location and have your vehicle towed to the nearest
dealer/retailer for service. See “Brakes,” “Brake System
Warning Light,” and “ABS Brake System Warning
Light” in the owner manual Index.
SERVICE HYBRID SYSTEM
If this message is displayed on the DIC, the vehicle may
continue to operate, but you need to have it serviced
as soon as possible.
SERVICE POWER STEERING
This message displays if a problem has been detected
with the electric power steering. Have your vehicle
serviced by your dealer/retailer immediately.
3-13

Your Driving, the Road, and
the Vehicle
Electric Power Steering
This vehicle has On-Demand Electric-Assist Power
Steering instead of conventional full-time hydraulic
power steering. It uses electricity supplied by the same
battery which is re-charged by the regenerative
braking system.
Because the system is On-Demand Electric-Assist,
energy is used only when the steering wheel is turned,
or when the steering gear is used to help isolate the
forces of rough roads. This system does not use power
steering fluid, making it maintenance-free.
Towing
Towing Your Vehicle
Consult your dealer/retailer or a professional towing
service if the disabled vehicle needs to be towed.
Towing a Trailer
For more information, see “Towing a Trailer” in the
owner manual Index.
Weight of the Trailer
How heavy can a trailer safely be?
It depends on how the rig is used. For example, speed,
altitude, road grades, outside temperature and how
much the vehicle is used to pull a trailer are all
important. It can depend on any special equipment on
the vehicle, and the amount of tongue weight the vehicle
can carry.
4-2