check engine GMC YUKON HYBRID 2010 Owners Manual

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

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.
{WARNING:
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.
See Starting the Vehicle
on page 3‑3for more
information.
AUTO STOP displays in the Driver Information
Center (DIC) when the vehicle speed is zero.
See DIC Warnings and Messages
on page 4‑12for more information.
4-9

Oil Pressure Light
{WARNING:
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.
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hood is closed, you should have the hood switch
serviced. Failure to service the hood switch properly
can result in an Auto Start condition.
Auto Stops will be disabled when this message is
displayed. 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 4 WHEEL DRIVE
This message may display if a problem occurs with the
four-wheel-drive system. If this message appears, stop
as soon as possible and turn off the vehicle. Make sure
the key is in the LOCK/OFF position for at least
one minute and then restart the vehicle and check for
the message on the DIC display. If the message is still
displayed or appears again when you begin driving,
the four-wheel-drive system needs service. See your
dealer/retailer.
SERVICE BATTERY CHARGING
SYSTEM
If the 12V battery system faults or fails this message will
appear on the DIC. The battery/charging system light
will appear in the instrument panel cluster. See “Battery
Warning Light” in the owner manual Index. Driving with
this message on could drain the battery. Have the
electrical system checked as soon as possible.
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.
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Section 6 Service and Appearance Care
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Doing Your Own Service Work . . . . . . . . . . . . . . . . . . 6-2
Checking Things Under the Hood . . . . . . . . . . . . . . . . .6-3
High Voltage Devices and Wiring . . . . . . . . . . . . . . . 6-3
Engine Compartment Overview . . . . . . . . . . . . . . . . . 6-4
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . 6-5
Drive Motor/Generator Control Module (DMCM) Coolant Surge Tank Pressure Cap . . . . . . . . . . . . 6-8
Drive Motor/Generator Control Module (DMCM) Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Power Steering Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Jump Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
Taillamps, Turn Signal, Stoplamps and Back-up Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
Replacement Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25 Electrical System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
High Voltage Devices and Wiring . . . . . . . . . . . . . . 6-25
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . . 6-26
Underhood Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 6-26
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28
Inflation - Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . 6-28
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . 6-29
Tire Inspection and Rotation . . . . . . . . . . . . . . . . . . . 6-33
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
Tire Sealant and Compressor Kit (Without Selector Switch) . . . . . . . . . . . . . . . . . . . . 6-35
Tire Sealant and Compressor Kit (With Selector Switch) . . . . . . . . . . . . . . . . . . . . . . . 6-45
Tire Sealant and Compressor Kit Storage . . . . . . 6-55
Appearance Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-56
Vehicle Care/Appearance Materials . . . . . . . . . . . . 6-56
Capacities and Specifications . . . . . . . . . . . . . . . . . . .6-57
6-1

A. See“Engine Air Cleaner/Filter” in the owner
manual.
B. Drive Motor/Generator Control Module (DMCM). See Drive Motor/Generator Control Module
(DMCM) Cooling System on page 6‑9.
C. Engine Oil Dipstick. See “Engine Oil”in the owner
manual.
D. Automatic Transmission Fluid Dipstick. See Automatic Transmission Fluid on page 6‑5.
E. Brake Fluid Reservoir. See Brakes on page 6‑13.
F. See “Underhood Fuse Block” in the owner manual.
G. See “Windshield Washer Fluid” in the owner
manual.
H. Hybrid Auxiliary Fuse Block. See Underhood Fuse
Block on page 6‑26.
I. DMCM Coolant Surge Tank Pressure Cap. See Drive Motor/Generator Control Module (DMCM)
Coolant Surge Tank Pressure Cap on page 6‑8.
J. See “Coolant Surge Tank Pressure Cap” in the
owner manual.
K. Engine Oil Fill Cap. See “Engine Oil”in the owner
manual.Automatic Transmission Fluid
When to Check and Change Automatic
Transmission Fluid
It is usually not necessary to check the transmission
fluid level. The only reason for fluid loss is a
transmission leak or overheating the transmission.
If you suspect a small leak, then use the following
checking procedures to check the fluid level. However,
if there is a large leak, then it may be necessary to have
the vehicle towed to a dealer/retailer service department
and have it repaired before driving the vehicle further.
Notice: Use of the incorrect automatic transmission
fluid may damage the vehicle, and the damages may
not be covered by the vehicle's warranty. Always
use the automatic transmission fluid listed in
Recommended Fluids and Lubricants on page 7‑2.
Change the fluid and filter at the intervals listed in the
Maintenance Schedule. See Scheduled Maintenance in
the owner manual. Be sure to use the transmission fluid
listed in Recommended Fluids and Lubricants
on
page 7‑2.
6-5

How to Check Automatic Transmission
Fluid
Notice:Too much or too little fluid can damage your
transmission. Too much can mean that some of the
fluid could come out and fall on hot engine parts or
exhaust system parts, starting a fire. Too little fluid
could cause the transmission to overheat. Be sure
to get an accurate reading if you check your
transmission fluid.
Before checking the fluid level, prepare the vehicle as
follows:
1. Start the engine and park the vehicle on a level surface. Keep the engine running.
2. Apply the parking brake and place the shift lever in P (Park).
3. With your foot on the brake pedal, move the shift lever through each gear range, pausing for about
three seconds in each range. Then, move the shift
lever back to P (Park).
4. Allow the engine to idle (500 –800 RPM) for at
least one minute. Slowly release the brake pedal.
5. Keep the engine running and press the Trip/Fuel button or trip odometer reset stem until TRANS
TEMP (Transmission Temperature) displays on the
Driver Information Center (DIC). 6. Using the TRANS TEMP reading, determine and
perform the appropriate check procedure. If the
TRANS TEMP reading is not within the required
temperature ranges, allow the vehicle to cool,
or operate the vehicle until the appropriate
transmission fluid temperature is reached.
Cold Check Procedure
Use this procedure only as a reference to determine if
the transmission has enough fluid to be operated safely
until a hot check procedure can be made. The hot
check procedure is the most accurate method to check
the fluid level. Perform the hot check procedure at the
first opportunity. Use this cold check procedure to check
fluid level when the transmission temperature is
between 24°C and 34°C (75°F and 93°F).
1. Locate the
transmission dipstick at
the rear of the engine
compartment, on the
passenger side of the
vehicle.
See Engine Compartment Overview
on page 6‑4for more information.
2. Pull out the dipstick and wipe it with a clean rag or paper towel.
6-6

3. Install the dipstick by pushing it back in all the way,wait three seconds, and then pull it back out again.
4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the
reading.
5. If the fluid level is below the COLD check band,add only enough fluid as necessary to bring the
level into the COLD band. It does not take much
fluid, generally less than 0.5 Liter (1 Pint). Do not
overfill.
6. Perform a hot check at the first opportunity after the transmission reaches a normal operating
temperature between 60°C and 75°C (140°F
and 167°F).
7. If the fluid level is in the acceptable range, push the dipstick back in all the way.
Hot Check Procedure
Use this procedure to check the transmission fluid level
when the transmission fluid temperature is between
60°C and 75°C (140°F and 167°F).
The hot check is the most accurate method to check
the fluid level. The hot check should be performed at
the first opportunity in order to verify the cold check.
The fluid level rises as fluid temperature increases, so it
is important to ensure the transmission temperature is
within range.
1. Locate thetransmission dipstick at
the rear of the engine
compartment, on the
passenger side of the
vehicle.
See Engine Compartment Overview
on page 6‑4for more information.
2. Pull out the dipstick and wipe it with a clean rag or paper towel.
3. Install the dipstick by pushing it back in all the way, wait three seconds, and then pull it back out again.
4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the
reading.
6-7

5. Safe operating level is within the HOT cross hatchband on the dipstick. If the fluid level is not within
the HOT band, and the transmission temperature
is between 60°C and 75°C (140°F and 167°F),
add or drain fluid as necessary to bring the level
into the HOT band. If the fluid level is low, add only
enough fluid to bring the level into the HOT band.
It does not take much fluid, generally less than
0.5 Liter (1 Pint). Do not overfill.
6. If the fluid level is in the acceptable range, push the dipstick back in all the way.
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 your
dealer/retailer.
Drive Motor/Generator Control
Module (DMCM) Coolant Surge Tank
Pressure Cap
See Engine Compartment
Overviewon page 6‑4for more information on
location.
6-8

If the coolant inside the DMCM coolant surge tank is
boiling, do not do anything else until it cools down.
The coolant level should be at or above the FULL
COLD mark with the vehicle parked on a level surface.
If it is not, there might be a leak at the DMCM cooler
core, DMCM pressure cap, DMCM cooler hoses,
DMCM cooling pump or somewhere else in the DMCM
cooling system.
Notice:Running the engine when there is a leak in
the hybrid cooling system can cause the hybrid
cooling system to lose all coolant and can damage
the system. Get any leak fixed before you drive the
vehicle or run the engine.
How to Add Coolant to the DMCM
Coolant Surge Tank
If no problem has been found yet, check to see if
coolant is visible in the DMCM coolant surge tank.
If coolant is visible, add pre‐mixed DEX-COOL™
coolant, available at your dealer/retailer, at the DMCM
coolant surge tank, but be sure the DMCM cooling
system, including the DMCM coolant surge tank
pressure cap, is cool before you do it. Use the
procedure following.
6-10