2010 GMC YUKON HYBRID warning light

2010 Chevrolet Tahoe and GMC Yukon/Yukon Denali Two-mode Hybrid M
In Brief. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Initial Drive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Hybrid Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Performance and Maintenance . . . . . . . . . . . . . . . . . . . 1-6
Seats and Restraint System . . . . . . . . . . . . . . . . . . . . . . 2-1
Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Restraint System Check . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Features and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Storage Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Starting and Operating Your Vehicle . . . . . . . . . . . . . . 3-3
Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Climate Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Warning Lights, Gages, and Indicators . . . . . . . . . . . 4-3
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . 4-12
Audio System(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14 Driving Your Vehicle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Your Driving, the Road, and the Vehicle . . . . . . . . . . 5-2
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Service and Appearance Care . . . . . . . . . . . . . . . . . . . 6-1
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Checking Things Under the Hood . . . . . . . . . . . . . . . . 6-3
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28
Appearance Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-56
Capacities and Specifications . . . . . . . . . . . . . . . . . . . 6-57
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-1

A chime will sound if the driver door is opened while in
Auto Stop as a reminder that the ignition switch is not in
the LOCK/OFF position. Always turn the ignition switch
to LOCK/OFF and remove the key from the ignition
switch when exiting the vehicle.
Auto Start
The vehicle also has an Auto Start feature. The engine
will remain off while in Auto Stop mode until vehicle
conditions require the engine to run. The near-instant
starting of the engine from Auto Stop mode is called
Auto Start.
EV Mode
The vehicle also has an EV mode which uses only
the electric motor to move the vehicle. With light
acceleration, the vehicle will drive in EV mode.
EV mode is unavailable when the vehicle is out of fuel.
See Starting the Vehicle in the Two‐Mode Hybrid
supplement to the owner manual.
Regenerative Braking
Regenerative braking enables the electric drive motor
to operate as a generator when coasting or braking.
Energy from the moving vehicle recharges the hybrid
battery.
The hydraulic disc brakes work with the regenerative
braking to insure effective braking.
The braking system is computer controlled and blends
the regenerative braking with the conventional hydraulic
disc brakes to meet any requirements for deceleration.
Because the controller applies the hydraulic brakes
through its high pressure accumulator, you may
occasionally hear the motor driven pump when it
recharges the system. This is normal. In the event of a
controller problem, the brake pedal may be harder to
push and the stopping distance may be longer.
See Regenerative Braking, Warning Lights, Gages, and
Indicators and Driver Information Center (DIC) in the
owner manual.
1-5

Manual Reclining Seatbacks
(Tahoe and Yukon Two-Mode Hybrid)
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 warning
message may come on in the driver information center.
See “Airbag Readiness Light” in the owner manual and
Driver Information Center (DIC)
on page 4‑12for 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.
2-3

2m(Two-Wheel Drive High):This setting is used for
driving in most street and highway situations. The front
axle is not engaged in two-wheel drive. This setting also
provides the best fuel economy.
AUTO (Automatic Four-Wheel Drive) : This setting is
ideal for use when road surface traction conditions are
variable. When driving your vehicle in AUTO, the front
axle is engaged, but the vehicle's power is primarily
sent to the rear wheels. When the vehicle's software
determines a need for more traction, the system will
transfer more power to the front wheels. Driving in this
mode results in slightly lower fuel economy than
Two-Wheel Drive High.
4
m(Four-Wheel Drive High): Use the four-wheel high
position when you need extra traction, such as on
snowy or icy roads or in most off-road situations.
This setting also engages the front axle to help drive
the vehicle. This is the best setting to use when
plowing snow.
4
n(Four-Wheel Drive Low) : This setting also
engages the front axle and delivers extra torque.
You may never need this setting. It sends maximum
power to all four wheels. You might choose Four-Wheel
Drive Low if you are driving off-road in deep sand, deep
mud, deep snow, and while climbing or descending
steep hills. The vehicle has StabiliTrak
®. Shifting into
Four-Wheel-Drive Low will turn Traction Control and
StabiliTrak
®off. See StabiliTrak®System in the index
of the Owner Manual for more information.
{WARNING:
Shifting the transfer case to N (Neutral) can cause
the vehicle to roll even if the transmission is in
P (Park). You or someone else could be seriously
injured. Be sure to set the parking brake before
placing the transfer case in N (Neutral). See
Parking Brake in the index of the Owner Manual
for more information.
N (Neutral) : Shift the vehicle's transfer case to
N (Neutral) only when towing the vehicle. See
Recreational Vehicle Towing or Towing Your Vehicle in
the index of the Owner Manual.
If the SERVICE 4 WHEEL DRIVE message stays on,
you should take the vehicle to your dealer/retailer for
service. See DIC Warnings and Messages
on
page 4‑12for more information.
3-11

Section 4 Instrument Panel
Climate Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Warning Lights, Gages, and Indicators . . . . . . . . . . .4-3
Instrument Panel Cluster . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Charging System Light . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Fuel Economy Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Brake System Warning Light . . . . . . . . . . . . . . . . . . . . 4-6
Antilock Brake System (ABS) Warning Light . . . . 4-7
StabiliTrak
®Indicator Light . . . . . . . . . . . . . . . . . . . . . . 4-7 Engine Coolant Temperature Gage . . . . . . . . . . . . . 4-8
Oil Pressure Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Fuel Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . .4-12
DIC Warnings and Messages . . . . . . . . . . . . . . . . . . 4-12
Audio System(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Navigation/Radio System . . . . . . . . . . . . . . . . . . . . . . 4-14
4-1

Warning Lights, Gages, and Indicators
Instrument Panel Cluster
United States version shown, Canada similar
4-3

Tachometer
United States Version
shown, Canada similar
When the gas engine is off and the key is in the
ON/RUN position, the position of the tachometer
indicator shows the state of the vehicle:
.AUTO STOP position indicates that the vehicle is
still able to move and the engine could restart, by
an Auto Start, at any time.
.OFF position indicates that the vehicle is off.
When the engine is on, the tachometer indicator shows
the engine's revolutions per minute (rpm).
Charging System Light
This 12 V battery light
comes on briefly when
the ignition is turned to
ON/RUN, but the engine
is not running, as a check
to show it is working.
It should go out once the engine has been started. If it
stays on, or comes on while driving, there could be a
problem with the 12 V charging system. Have the
vehicle serviced by your dealer/retailer. A 12 V charging
system Driver Information Center (DIC) message may
also appear. See DIC Warnings and Messages
on
page 4‑12for more information. This light could
indicate that there are electrical problems. Have it
checked right away. If a short distance must be driven
with the light on, be certain to turn off all the
accessories.
4-4

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.
United StatesCanadaThis 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.
{WARNING:
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. See Towing Your Vehicle on page 5‑2.
4-6