Malfunction Indicator Lamp
Check Engine Light
Your vehicle has a
computer which monitors
operation of the fuel,
ignition, and emission
control systems.
This system is called OBD II (On-Board
Diagnostics-Second Generation) and is intended to
assure that emissions are at acceptable levels for
the life of the vehicle, helping to produce a cleaner
environment. The Check Engine light comes on
to indicate that there is a problem and service is
required. Malfunctions often will be indicated by the
system before any problem is apparent. This may
prevent more serious damage to your vehicle.
This system is also designed to assist your service
technician in correctly diagnosing any malfunction.
Notice:If you keep driving your vehicle with this
light on, after awhile, your emission controls may not
work as well, your fuel economy may not be as good,
and your engine may not run as smoothly. This could
lead to costly repairs that may not be covered by
your warranty.Notice:Modi cations made to the engine,
transmission, exhaust, intake, or fuel system of
your vehicle or the replacement of the original tires
with other than those of the same Tire Performance
Criteria (TPC) can affect your vehicle’s emission
controls and may cause this light to come on.
Modi cations to these systems could lead to costly
repairs not covered by your warranty. This may
also result in a failure to pass a required Emission
Inspection/Maintenance test. SeeAccessories
and Modifications on page 6-3.
This light should come on brie y, as a check to show
you it is working, as you start the engine. If the light
does not come on, have it repaired. This light will also
come on during a malfunction in one of two ways:
Light Flashing— A mis re condition has
been detected. A mis re increases vehicle
emissions and may damage the emission control
system on your vehicle. Diagnosis and service may
be required.
Light On Steady— An emission control system
malfunction has been detected on your vehicle.
Diagnosis and service may be required.
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CRUISE NOT READY:This message indicates that
ACC will not activate due to a temporary condition.
Your vehicle does not require service. If this message
appears when you attempt to activate the system,
continue driving for several minutes then try again to
activate the system.
DRIVER NO. X (1 OR 2):This message will be
displayed when the vehicle is started or when there
is a change of driver. The message will show which
driver is activating the personalization feature. It will
only stay on for ve seconds.
ENGINE HOT, STOP ENGINE:This message will
appear when the engine has overheated. Stop and
turn the engine off immediately to avoid severe engine
damage. SeeEngine Overheating on page 6-25.
A multiple chime will also sound when this message
is displayed.
ENGINE PROTECTION REDUCE ENGINE RPM:
If this message appears, the control system has
determined that continued operation at the existing
engine speed may lead to engine overheating.
Therefore, you should lower the engine speed by
upshifting the transmission or drive at a lower speed.HEADLAMPS SUGGESTED:If it is dark enough
outside and the headlamps and Twilight Sentinel®
controls are off, this message will display on the DIC.
This message informs the driver that turning on the
exterior lamps is recommended. It has become
dark enough outside to require the headlamps and/or
other exterior lamps. This message will also appear
if the optional Rainsense™ wiping feature is on and
the Twilight Sentinel
®is off.
HIGH TRANS (Transmission) TEMP (Temperature):
This message indicates that the transmission uid in
your vehicle is too hot. Stop and allow your vehicle to idle
until it cools down or until this message is removed.
HIGH VOLTAGE:This message shows that the
electrical charging system is overcharging. To avoid
being stranded, have the electrical system checked
by your GM dealer. You can reduce the charging
overload by using the accessories. Turn on the lamps
and radio, set the climate control on AUTO and the
fan speed on HI, and turn the rear window defogger
on. You can monitor battery voltage on the DIC
by pressing the information button. The normal range
is 11.5 to 15.5 volts when the engine is running.
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HOT ENGINE–A/C OFF:This message displays when
the engine coolant becomes hotter than the normal
operating temperature. To avoid added strain on a hot
engine, the air conditioning compressor is automatically
turned off. When the coolant temperature returns to
normal, the A/C operation will automatically resume.
You can continue to drive your vehicle. If this message
continues to appear, have the system repaired by
your GM dealer as soon as possible to avoid
compressor damage.
ICE POSSIBLE:This message appears when the
outside air temperature is cold enough to create icy
road conditions.
LEFT DOOR AJAR:This message will display anytime
the vehicle engine is running, the transmission is not
in PARK (P) and the driver’s door is open or ajar.
A chime will sound when the vehicle’s speed is greater
than 3 mph (4.8 km/h).
LOW BRAKE FLUID:This message will display if the
vehicle is running to inform the driver that the brake
uid level is low. Have the brake system serviced
by your GM dealer as soon as possible. See “Brake
Fluid” underBrakes on page 6-35.LOW COOLANT:This message will appear when there
is a low level of engine coolant. Have the cooling
system serviced by your GM dealer as soon as possible.
SeeEngine Coolant on page 6-22.
LOW FUEL:This message will appear when the fuel
supply is less than 5 gallons (18.9 L) and the display is
turned off. A single chime will also sound when this
message is displayed.
LOW OIL LEVEL:For correct operation of the low oil
sensing system, your vehicle should be on a level
surface. A false LOW OIL LEVEL message may appear
if the vehicle is parked on a grade. The oil level
sensing system does not check for actual oil level if
the engine has been off for a short period of time,
and the oil level is never checked while the engine is
running. If the LOW OIL LEVEL message appears,
and your vehicle has been parked on level ground
with the engine off for at least 30 minutes, the oil level
should be checked by observing the oil dipstick. Prior
to checking the oil level, be sure the engine has been
off for a few minutes and your vehicle is on a level
surface. Then check the dipstick and add oil if
necessary. SeeEngine Oil on page 6-15.
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NO FOB, OFF OR RUN?:When this message displays,
it means that the keyless access transmitter is not
detected inside the vehicle while you are trying to turn
the ignition off. Your vehicle may be near a strong
radio antenna signal causing the keyless access system
to be jammed. The vehicle will remain in ACC until off
or START has been pressed or ve minutes has
expired. If you turn the ignition off and you cannot nd
the keyless access transmitter, you will not be able
to restart the vehicle. The keyless access transmitter
needs to be inside of the vehicle in order for the vehicle
to start. SeeStarting the Engine on page 2-22for
more information.
OVER SPEED WARNING:This message is displayed
when the vehicle speed exceeds a certain limit as
required by some export countries. A chime will sound
when this message is displayed.
PRESS BRAKE TO START:The brake pedal must
be applied to start the vehicle. Make sure you are
pressing the brake pedal all the way down.
REDUCED ENGINE POWER:This message informs
you that the vehicle is reducing engine power because
the transmission is being placed in gear under conditions
that may cause damage to the vehicle’s engine,
transmission, or ability to accelerate. Reduced engine
power can affect the vehicle’s ability to accelerate. If this
message is on, but there is no reduction in performance,
proceed to your destination.The performance may be reduced the next time the
vehicle is driven. The vehicle may be driven at a reduced
speed while this message is on, but acceleration and
speed may be reduced. Anytime this message stays on,
the vehicle should be taken to your GM dealer for service
as soon as possible.
RIGHT DOOR AJAR:The passenger’s door is open or
ajar when this message appears. The vehicle must
be running and the transmission not in PARK (P) for this
message to display. A chime will sound if the vehicle’s
speed is greater than 3 mph (5 km/h).
SERVICE A/C:This message appears when the
electronic sensors that control the air conditioning and
heating systems are no longer working. Have the climate
control system serviced by your GM dealer if you
notice a drop in heating and air conditioning efficiency.
SERVICE ABS (Anti-Lock Brake System):If the
SERVICE ABS message is displayed when you
are driving, stop as soon as possible and turn the
ignition off. Then start the engine again to reset the
system. If the message stays on, or comes back
on again while you are driving, your vehicle is in need
of service. See your GM dealer.
If the SERVICE ABS message is being displayed, your
Traction Control System and StabiliTrak
®System
will also be disabled.
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The Driver Information Center will scroll three messages:
SERVICE ABS, SERVICE TRACTION SYS and
SERVICE STABILITRAK, and the anti-lock brake system
and traction control warning lights on the instrument
panel cluster will be illuminated. SeeAnti-Lock Brake
System Warning Light on page 3-55andTraction
Control System (TCS) Warning Light on page 3-56. The
driver can acknowledge these messages by pressing
the RESET button three times. When the service
message is displayed, the computer controlled systems
will not assist the driver and you should have the
system repaired by your GM dealer as soon as possible.
Adjust your driving accordingly.
SERVICE AFS LAMPS:This message indicates that
the Adaptive Forward Lighting System (AFS) is disabled
and needs service. See your GM dealer. SeeAdaptive
Forward Lighting System on page 3-31for more
information.
SERVICE ELECT (Electrical) SYSTEM:This message
will display if an electrical problem has occurred within
the Powertrain Control Module (PCM). Have your vehicle
serviced by your GM dealer.
SERVICE FUEL SYSTEM:The Powertrain Control
Module (PCM) has detected a problem within the
fuel system when this message appears. Have your
vehicle serviced by your GM dealer. This message will
also be displayed when the cluster is not getting
fuel information from the PCM.SERVICE RADAR CRUISE:If your vehicle has this
feature, this message indicates that the Adaptive Cruise
Control (ACC) system is disabled and needs service.
See your GM dealer.
SERVICE RIDE CONTROL:This message indicates
there is a problem with the Magnetic Ride Control
System. Have your vehicle serviced by your GM dealer.
SERVICE TRACTION SYS (System):This message
indicates there is a problem with the Traction Control
System (TCS). Have your vehicle serviced by your
GM dealer.
SERVICE STABILITRAK:If this message appears,
it means there may be a problem with your stability
enhancement system. If you see this message, try to
reset the system. Stop, turn off the engine, then start the
engine again. If the SERVICE STABILITRAK message
still comes on, it means there is a problem. You should
see your GM dealer for service. Reduce your speed and
drive accordingly. A single chime will also sound when
this message is displayed.
SERVICE TRANSMISSION:This message indicates
that there is a problem with the transmission. Have your
vehicle serviced by your GM dealer.
SERVICE VEHICLE SOON:This message is displayed
when a non-emissions related powertrain malfunction
occurs. Have your vehicle serviced by your GM dealer
as soon as possible.
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