2010 GMC YUKON maintenance

Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments may have
programs to inspect the on-vehicle emission control
equipment For the inspection, the emission system
test equipment is connected to the vehicle’s Data Link
Connector (DLC).
The DLC is under the instrument panel to the left of the
steering wheel. See your dealer if assistance is needed.The vehicle may not pass inspection if:
.the check engine light is on with the engine
running, or if the light does not come on when
the ignition is turned to ON/RUN while the engine
is off.
.the critical emission control systems have not been
completely diagnosed by the system. This can
happen if the battery has recently been replaced or
if the battery has run down. The diagnostic system
evaluates critical emission control systems during
normal driving. This can take several days of
routine driving. If this has been done and the
vehicle still does not pass the inspection, your
dealer can prepare the vehicle for inspection.
4-42

Oil Pressure Gauge
United StatesCanada
The oil pressure gauge shows the engine oil pressure
in psi (pounds per square inch) when the engine
is running. Canadian vehicles indicate pressure in
kPa (kilopascals).
Oil pressure may vary with engine speed, outside
temperature and oil viscosity, but readings above the
low pressure zone indicate the normal operating range.
When the oil pressure reaches the low pressure zone,
the OIL PRESSURE LOW STOP ENGINE message
appears in the Driver Information Center (DIC). See DIC
Warnings and Messages
on page 4‑61and Engine Oilon page 6‑18for more information. 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.
If the vehicle is a Two-mode Hybrid, see the Two-mode
Hybrid manual for more information.
4-43

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 while starting the engine.
If it does not, have the vehicle serviced by your dealer.
If the system is working normally the indicator light then
goes off.
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 it might have some other
system problem.
Security Light
For information regarding
this light and the vehicle's
security system, see
Content Theft-Deterrent
on page 3‑23.
4-44

Transmission Temperature
Press the trip/fuel button until TRANS TEMP displays.
This display shows the temperature of the automatic
transmission fluid in either degrees Fahrenheit (°F) or
degrees Celsius (°C).
Instantaneous Economy and Active Fuel
Management™Indicator
If your vehicle has this display, press the trip/fuel button
until INST ECON V8 displays. This display shows the
current fuel economy at a particular moment and will
change frequently as driving conditions change. This
display shows the instantaneous fuel economy in miles
per gallon (mpg) or liters per 100 kilometers (L/100 km).
Unlike average economy, this screen cannot be reset.
An Active Fuel Management indicator will display on the
right side of the DIC, while INST ECON displays on the
left side. Active Fuel Management allows the engine to
operate on either four or eight cylinders, depending on
your driving demands. When Active Fuel Management
is active, V4 will display on the DIC. When Active Fuel
Management is inactive, V8 will display. See Active
Fuel Management™
on page 3‑33for more
information.
Blank Display
This display shows no information.
Vehicle Information Menu Items
T
(Vehicle Information): Press this button to scroll
through the following menu items:
Oil Life
Press the vehicle information button until OIL LIFE
REMAINING displays. This display shows an
estimate of the oil's remaining useful life. If you see
99% OIL LIFE REMAINING on the display, that means
99% of the current oil life remains. The engine oil life
system will alert you to change the oil on a schedule
consistent with your driving conditions.
When the remaining oil life is low, the CHANGE
ENGINE OIL SOON message will appear on the
display. See “CHANGE ENGINE OIL SOON” underDIC
Warnings and Messages
on page 4‑61. You should
change the oil as soon as you can. See Engine Oilon
page 6‑18. In addition to the engine oil life system
monitoring the oil life, additional maintenance is
recommended in the Maintenance Schedule in this
manual. See Scheduled Maintenance
on page 7‑3for more information.
4-51

Trailer Gain and Output
On vehicles with the Integrated Trailer Brake
Control (ITBC) system, the trailer brake display
appears in the DIC. Press the trip odometer reset
stem until TRAILER GAIN and OUTPUT display.
TRAILER GAIN shows the trailer gain setting. This
setting can be adjusted from 0.0 to 10.0 with either a
trailer connected or disconnected. To adjust this setting,
see“Integrated Trailer Brake Control System” under
Towing a Trailer
on page 5‑49for more information.
OUTPUT shows the power output to the trailer anytime
a trailer with electric brakes is connected. Output is
displayed in 0 to 10 bars. Dashes may appear in the
OUTPUT display. See “Integrated Trailer Brake Control
System” underTowing a Trailer
on page 5‑49for more
information.
Compass Zone Setting
This display allows for setting the compass zone.
See DIC Compasson page 4‑58for more information.
Compass Recalibration
This display allows for calibrating the compass.
SeeDIC Compasson page 4‑58for more information.
Oil Life
To access this display, the vehicle must be in
P (Park). Press the trip odometer reset stem until
OIL LIFE REMAINING displays. This display shows an
estimate of the oil's remaining useful life. If you see
99% OIL LIFE REMAINING on the display, that means
99% of the current oil life remains. The engine oil life
system will alert you to change the oil on a schedule
consistent with your driving conditions.
When the remaining oil life is low, the CHANGE
ENGINE OIL SOON message will appear on the
display. See “CHANGE ENGINE OIL SOON” underDIC
Warnings and Messages
on page 4‑61. You should
change the oil as soon as you can. See Engine Oilon
page 6‑18. In addition to the engine oil life system
monitoring the oil life, additional maintenance is
recommended in the Maintenance Schedule in this
manual. See Scheduled Maintenance
on page 7‑3for more information.
Remember, you must reset the OIL LIFE display
yourself after each oil change. It will not reset itself.
Also, be careful not to reset the OIL LIFE display
accidentally at any time other than when the oil has just
been changed. It cannot be reset accurately until the
next oil change. To reset the engine oil life system,
seeEngine Oil Life System on page 6‑20.
4-57

DIC Warnings and Messages
Messages are displayed on the DIC to notify the driver
that the status of the vehicle has changed and that
some action may be needed by the driver to correct the
condition. Multiple messages may appear one after
another.
Some messages may not require immediate action, but
you can press any of the DIC buttons on the instrument
panel or the trip odometer reset stem on the instrument
panel cluster to acknowledge that you received the
messages and to clear them from the display.
Some messages cannot be cleared from the DIC
display because they are more urgent. These
messages require action before they can be cleared.
You should take any messages that appear on the
display seriously and remember that clearing the
messages will only make the messages disappear,
not correct the problem.
The following are the possible messages that can be
displayed and some information about them.
If your vehicle is a Two-mode Hybrid, see the
Two-mode Hybrid manual for more information.
BATTERY LOW START VEHICLE
When the vehicle’s battery is severely discharged, this
message will display and four chimes will sound. Start
the vehicle immediately. If the vehicle is not started and
the battery continues to discharge, the climate controls,
heated seats, and audio systems will shut off and the
vehicle may require a jump start. These systems will
function again after the vehicle is started.
CHANGE ENGINE OIL SOON
This message displays when the engine oil needs to
be changed. When you change the engine oil, be sure
to reset the CHANGE ENGINE OIL SOON message.
See Engine Oil Life System
on page 6‑20for
information on how to reset the message. See Engine
Oil
on page 6‑18and Scheduled Maintenanceon
page 7‑3for more information.
4-61

Before You Go Off-Roading
.Have all necessary maintenance and service
work done.
.Make sure there is enough fuel, that fluid levels are
where they should be, and that the spare tire, if the
vehicle has one, is fully inflated.
.Be sure to read all the information about
four-wheel-drive vehicles in this manual.
.Make sure all underbody shields, if the vehicle has
them, are properly attached.
.Know the local laws that apply to off-roading where
you will be driving or check with law enforcement
people in the area.
.Be sure to get the necessary permission if you will
be on private land.
If you think you will need some more ground clearance
at the front of your vehicle, you can remove the front
fascia lower air dam. The air dam is held in place by
two bolts and 10 snaps accessible from underneath the
front fascia. To remove the air dam:
1. Remove the two outboard air dam bolts.
2. With a flat‐blade tool, disengage the snaps.
3. After the bolts are removed and the snaps are disengaged, push forward on the air dam until it
is free.
Notice: Operating your vehicle for extended periods
without the front fascia lower air dam installed can
cause improper air flow to the engine. Always be
sure to replace the front fascia air dam when you
are finished off-road driving.
After off-roading, be sure to reinstall the air dam:
1. Line up the snaps and push the air dam rearward to engage the snaps.
2. Install the two outboard bolts.
5-13

Driving in Water
{WARNING:
Driving through rushing water can be dangerous.
Deep water can sweep your vehicle downstream
and you and your passengers could drown. If it
is only shallow water, it can still wash away the
ground from under your tires, and you could lose
traction and roll the vehicle over. Do not drive
through rushing water.
Heavy rain can mean flash flooding, and flood waters
demand extreme caution.
Find out how deep the water is before driving through it.
Do not try it if it is deep enough to cover the wheel
hubs, axles, or exhaust pipe —you probably will not get
through. Deep water can damage the axle and other
vehicle parts.
If the water is not too deep, drive slowly through it.
At faster speeds, water splashes on the ignition system
and the vehicle can stall. Stalling can also occur if you get the tailpipe under water. If the tailpipe is under
water, you will never be able to start the engine.
When going through water, remember that when
the brakes get wet, it might take longer to stop.
See
Driving in Rain and on Wet Roads on page 5‑24.After Off-Road Driving
Remove any brush or debris that has collected
on the underbody, chassis, or under the hood.
These accumulations can be a fire hazard.
After operation in mud or sand, have the brake linings
cleaned and checked. These substances can cause
glazing and uneven braking. Check the body structure,
steering, suspension, wheels, tires, and exhaust system
for damage and check the fuel lines and cooling system
for any leakage.
The vehicle requires more frequent service due to
off-road use. Refer to the Maintenance Schedule for
additional information.
5-23