engine GMC YUKON XL 2007 Service Manual

If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully
install the cap. SeeFilling the Tank on page 432.
The diagnostic system can determine if the
fuel cap has been left off or improperly installed.
A loose or missing fuel cap will allow fuel to
evaporate into the atmosphere. A few driving trips
with the cap properly installed should turn the
light off.
Did you just drive through a deep puddle of
water?
If so, your electrical system may be wet. The
condition will usually be corrected when the
electrical system dries out. A few driving trips
should turn the light off.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 428. Poor fuel
quality will cause your engine not to run as
efficiently as designed. You may notice this as
stalling after start-up, stalling when you put
the vehicle into gear, misring, hesitation on
acceleration, or stumbling on acceleration.
(These conditions may go away once the engine
is warmed up.) This will be detected by the
system and cause the light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at
least one full tank of the proper fuel to turn the
light off.
If none of the above steps have made the light
turn off, your dealer can check the vehicle.
Your dealer has the proper test equipment and
diagnostic tools to x any mechanical or electrical
problems that may have developed.
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Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments have
or may begin programs to inspect the emission
control equipment on your vehicle. Failure to pass
this inspection could prevent you from getting a
vehicle registration.
Here are some things you need to know to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the
check engine light is on or not working properly.
Your vehicle will not pass this inspection if the OBD
(on-board diagnostic) system determines that
critical emission control systems have not been
completely diagnosed by the system. The vehicle
would be considered not ready for inspection. This
can happen if you have recently replaced your
battery or if your battery has run down. The
diagnostic system is designed to evaluate critical
emission control systems during normal driving.
This may take several days of routine driving. If you
have done this and your vehicle still does not pass
the inspection for lack of OBD system readiness,
your GM dealer can prepare the vehicle for
inspection.
Oil Pressure Gage
The oil pressure gage 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 will appear in the Driver
Information Center. SeeDIC Warnings and
Messages on page 254andEngine Oil on
page 438for more information.
United StatesCanada
239

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
your oil as soon as possible.
{CAUTION:
Do not keep driving if the oil pressure is
low. If you do, your engine can become so
hot that it catches re. You or others could
be burned. Check your oil as soon as
possible and have your vehicle serviced.
Notice:Lack of proper engine oil maintenance
may damage the engine. The repairs would
not be covered by your warranty. Always follow
the maintenance schedule in this manual for
changing engine oil.
Oil Pressure Light
{CAUTION:
Do not keep driving if the oil pressure is
low. If you do, your engine can become so
hot that it catches re. You or others
could be burned. Check your oil as soon
as possible and have your vehicle
serviced.
Notice:Lack of proper engine oil maintenance
may damage the engine. The repairs would
not be covered by your warranty. Always follow
the maintenance schedule in this manual for
changing engine oil.
240

This light tells you if
there could be a
problem with your
engine oil pressure.
This light will come on briey when you start your
engine. That is a check to be sure the light
works. If it does not come on, be sure to have it
xed so it will be there to warn you if something
goes wrong.
When the light comes on and stays on, it means
that oil is not owing through your engine properly.
You could be low on oil and you might have
some other system problem.Security Light
This light ashes when
the vehicle security
system is activated.
Fog Lamp Light
The fog lamps light will
come on when the fog
lamps are in use.
The light will go out when the fog lamps are
turned off. SeeFog Lamps on page 202for more
information.
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Fuel Gage
The fuel gage, when the ignition is on, tells you
about how much fuel you have left in your tank.
The gage will rst indicate empty before you
are out of fuel, and you should get more fuel as
soon as possible.
When the fuel tank is low, the FUEL LEVEL LOW
message will appear. SeeDIC Warnings and
Messages on page 254.
Here are some situations you may experience with
your fuel gage. None of these indicate a problem
with the fuel gage.
At the gas station, the fuel pump shuts off
before the gage reads full.
It takes a little more or less fuel to ll up than
the fuel gage indicated. For example, the
gage may have indicated the tank was half full,
but it actually took a little more or less than
half the tank’s capacity to ll the tank.
The gage goes back to empty when you turn
off the ignition.
Low Fuel Warning Light
This light, under the fuel
gage, will come on
briey when you
are starting the engine.
This light and a chime will come on when the fuel
tank is low on fuel. There will also be a “FUEL
LEVEL LOW” message on the Driver Information
Center, seeDIC Warnings and Messages on
page 254for more information. When you add fuel
this light and message should go off. If it does
not, have your vehicle serviced.United StatesCanada
243

Driver Information Center (DIC)
Your vehicle has a Driver Information Center (DIC).
The DIC displays information about your vehicle.
It also displays warning messages if a system
problem is detected.
All messages will appear in the DIC display
located below the tachometer in the instrument
panel cluster.
The DIC comes on when the ignition is on. After a
short delay, the DIC will display the information
that was last displayed before the engine was
turned off.
If your vehicle has DIC buttons, see “DIC
Operation and Displays (With DIC Buttons)” later
in this section andDIC Vehicle Customization
(With DIC Buttons) on page 264for the displays
available.
If your vehicle does not have DIC buttons, see
“DIC Operation and Displays (Without DIC
Buttons)” later in this section for the displays
available.
DIC Operation and Displays
(With DIC Buttons)
If your vehicle has DIC buttons, the information
below explains the operation of this system.
The DIC has different displays which can be
accessed by pressing the DIC buttons located on
the instrument panel, to the right of the steering
wheel.
The DIC displays trip, fuel, and vehicle system
information, and warning messages if a system
problem is detected.
The DIC also allows some features to be
customized. SeeDIC Vehicle Customization (With
DIC Buttons) on page 264for more information.
If your vehicle has DIC buttons, you can also use
the trip odometer reset stem to view some of
the DIC displays. See “DIC Operation and Displays
(Without DIC Buttons)” later in this section.
244

DIC Buttons
The buttons are the
trip/fuel, vehicle
information,
customization, and
set/reset buttons. The
button functions
are detailed in the
following pages.
3(Trip/Fuel):Press this button to display the
odometer, trip odometer, fuel range, average
economy, fuel used, timer, and transmission
temperature. Some vehicles also display
instantaneous economy and a Displacement
on Demand™ (DoD™) indicator.
T(Vehicle Information):Press this button to
display the oil life, units, tire pressure readings
for vehicles with a Tire Pressure Monitor (TPM)
system, engine hours, Tire Pressure Monitor
(TPM) system programming for vehicles with a
TPM system, and remote keyless entry transmitter
programming.
U(Customization):Press this button to
customize the feature settings on your vehicle.
SeeDIC Vehicle Customization (With DIC Buttons)
on page 264for more information.
V(Set/Reset):Press this button to set or reset
certain functions and to turn off or acknowledge
messages on the DIC.
245

Timer
Press the trip/fuel button until TIMER displays.
This display can be used as a timer.
To start the timer, press the set/reset button while
TIMER is displayed. The display will show the
amount of time that has passed since the timer was
last reset, not including time the ignition is off. Time
will continue to be counted as long as the ignition is
on, even if another display is being shown on the
DIC. The timer will record up to 99 hours,
59 minutes and 59 seconds (99:59:59) after which
the display will return to zero.
To stop the timer, press the set/reset button briey
while TIMER is displayed.
To reset the timer to zero, press and hold the
set/reset button while TIMER is displayed.
Transmission Temperature
Press the trip/fuel button until TRANS TEMP
displays. This display shows the temperature of
the automatic transmission uid in either degrees
Fahrenheit (°F) or degrees Celsius (°C).
Instantaneous Economy and Displacement
on Demand™ (DoD™) Indicator
If your vehicle has this display, press the trip/fuel
button until INST ECONOMY V8 MODE
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.
A Displacement on Demand™ (DoD™) indicator
will display on the right side of the DIC, while
INST ECONOMY displays on the left side.
DoD™ allows the engine to operate on either four
or eight cylinders, depending on your driving
demands. When DoD™ is active, V4 MODE will
display on the DIC. When DoD™ is inactive,
V8 MODE will display. SeeDisplacement
on Demand™ (DoD™) on page 141for more
information.
Blank Display
This display shows no information.
248

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
your 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” under
DIC Warnings and Messages on page 254. You
should change your oil as soon as you can. See
Engine Oil on page 438. In addition to the engine oil
life system monitoring the oil life, additional
maintenance is recommended in the Maintenance
Schedule in this manual. SeeScheduled
Maintenance on page 555for 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 441.
Units
Press the vehicle information button until UNITS
displays. This display allows you to select between
English or Metric units of measurement. Once in
this display, press the set/reset button to select
between ENGLISH or METRIC units. All of
the vehicle information will then be displayed in
the unit of measurement selected.
Tire Pressure
If your vehicle has a Tire Pressure Monitor (TPM)
system, the pressure for each tire can be viewed in
the DIC. The tire pressure will be shown in either
pounds per square inch (psi) or kilopascals (kPa).
Press the vehicle information button until the DIC
displays FRONT TIRES PSI (kPa) LEFT ##
RIGHT ##. Press the vehicle information button
again until the DIC displays REAR TIRES PSI (kPa)
LEFT ## RIGHT ##.
249

If a low or high tire pressure condition is detected
by the system while driving, a message advising
you to check the pressure in a specic tire
will appear in the display. SeeInation - Tire
Pressure on page 490andDIC Warnings
and Messages on page 254for more information.
Engine Hours
Press the vehicle information button until ENGINE
HOURS displays. This display shows the total
number of hours the engine has run.
Relearn Tire Positions
If your vehicle has a Tire Pressure Monitor (TPM)
system, after rotating the tires or after replacing
a tire or sensor, the system must re-learn the tire
positions. To re-learn the tire positions, see
Tire Pressure Monitor System on page 492. See
Tire Inspection and Rotation on page 497andDIC
Warnings and Messages on page 254for more
information.
Relearn Remote Key
This display allows you to match remote keyless
entry transmitters to your vehicle. To match a
remote keyless entry transmitter to your vehicle,
do the following:
1. Press the vehicle information button until
PRESS
VTO RELEARN REMOTE KEY
displays.
2. Press the set/reset button until REMOTE KEY
LEARNING ACTIVE is displayed.
3. Press and hold the lock and unlock buttons
on the rst transmitter at the same time for
approximately 15 seconds.
A chime will sound indicating that the
transmitter is matched.
4. To match additional transmitters at this time,
repeat Step 3.
Each vehicle can have a maximum of eight
transmitters matched to it.
5. To exit the programming mode, you must
cycle the key to LOCK.
Blank Display
This display shows no information.
250