GM Service Manual Online
For 1990-2009 cars only

Warning 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. If there is more than one message that needs to be displayed they will appear one after another. Some messages may not require immediate action but you should press the select button or the trip odometer reset stem on the instrument panel cluster to acknowledge that you received the message and clear it from the display. Some messages cannot be cleared from the display because they are more urgent; these messages require action before they can be removed from the DIC display. The following are the possible messages that can be displayed and some information about them. For information on other DIC messages, see "DIC Warnings and Messages" in the owner manual Index.

42V SWITCH OFF

When a fuse in the 42-volt battery system is blown or the battery disconnect switch is open, this message will appear. It will clear when the problem is fixed, when the battery disconnect switch is closed or by pressing the DIC select button or the trip reset stem on the instrument panel cluster. The fuse on the 42-volt battery pack can only be replaced by a qualified service technician. See Fuses and Circuit Breakers and Battery Disconnect Switch and "Instrument Panel Cluster" in the owner manual Index for more information.

120V DISABLED

This message will display when the hybrid's power system is too hot to function in the APO normal mode. This message will display for 10 seconds or until the system cools down. This message will also display for 10 seconds each time the APO is activated while the system is too hot to function. See "Normal Mode" under Auxiliary Power Outlet (APO) System .

120V GROUND FAULT

This message will display when the APO normal or continuous mode turns off due to an electrical ground fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the engine will continue to run for five minutes after a ground fault condition is identified and the APO is not reset. The message will be displayed the entire time the engine is running. See "Resetting the Ground Fault Detection Circuit (GFDC)" under Auxiliary Power Outlet (APO) System .

120V OVERLOAD

This message will display when the APO normal or continuous mode turns off due to an electrical overload fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the engine will continue to run for five minutes after an overload condition is identified if the APO is not reset. The message will be displayed the entire time the engine is running. See "Resetting the Ground Fault Detection Circuit (GFDC)" under Auxiliary Power Outlet (APO) System .

120V READY

This message will display and the light in the APO button will flash when the system is ready/waiting to enter the continuous mode for 30 seconds or until the ignition is turned to LOCK. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

120V SYSTEM FAULT

This message will display when the APO normal or continuous mode turns off due to a system fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the message will display again for 60 seconds. It will also display for 10 seconds each time the engine is started until the problem is fixed. See Auxiliary Power Outlet (APO) System .

BATTERY NOT CHARGING

If the hybrid battery system faults or fails (42-volt or 12-volt system), this message will appear on the DIC. The engine auto start/stop feature will be disabled and the battery/charging system light will appear in the instrument panel cluster. See "Battery Warning Light" in the owner manual Index.

Driving with this light on could drain your batteries. Have the electrical system checked as soon as possible. Pressing the select button or the trip odometer reset stem on the instrument panel cluster will acknowledge this message and clear it from the DIC display.

ENGINE AUTO START MODE

When the vehicle is in PARK (P) and engine auto start is possible, this message will display to let you know that the engine may start automatically at any given time. This message will clear when the vehicle is taken out of PARK (P), if the key is turned to LOCK, or when the engine auto starts.

Pressing the DIC select button or the trip odometer reset stem on the instrument panel cluster will also clear the message.

ENGINE COOLANT HOT

If the engine cooling system temperature gets hot, this message will appear on the DIC. Stop the vehicle and let the engine idle in PARK (P) to allow the coolant to reach a safe temperature. This message will clear when the coolant temperature drops to a safe operating temperature. See "Cooling System" in the owner manual Index for more information.

The APO continuous mode will also stop operating when this message comes on. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

FUEL LEVEL LOW

If the fuel level is low while the APO system is in continuous mode, this message will appear on the DIC and the horn will sound once every minute for a maximum of five minutes. Refuel as soon as possible. If the vehicle is left unattended for the full five minute warning, the engine and APO system will shut down, unless the APO button is pressed during the five minute warning period. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

Pressing the select button or the trip odometer reset stem on the instrument panel cluster will acknowledge this message immediately and clear it from the DIC display. It will also clear itself after five minutes. The low fuel light near the fuel gage will still remain on in either case. See "Fuel Gage" and "Instrument Panel Cluster" in the owner manual Index.

HOOD AJAR

If the hood is not fully closed, this message will appear on the display. Close the hood to clear the message. Pressing the select button or the trip stem on the instrument panel cluster will acknowledge this message and clear it from the DIC display also.

When this message is displayed the auto start/stop function will not operate with the hood open. If the vehicle is in auto start/stop mode and the engine is in the stop mode when this message appears, you will have to restart the engine with the ignition key to reset the auto start/stop mode and allow it to function normally. See Starting the Vehicle .

OIL PRESSURE LOW

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 as soon as possible and have your vehicle serviced. See "Engine Oil" in the owner manual Index.

The APO continuous mode will stop operating when this message comes on. The message will reappear for 60 seconds when the vehicle is shut off and 10 seconds when restarted to let you know why the APO continuous mode was canceled. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

SECURITY

This message, along with the security light on the instrument cluster, will appear on the DIC for 60 seconds when a security violation has occurred. The APO continuous mode will cancel at this time . See "Theft-Deterrent Systems" in the owner manual Index.

SERVICE 42V BATTERIES

This message will display when the 42-volt batteries need service or replacement due to age or if a failure condition is present. This message will be displayed for 10 seconds and then will display again each time the ignition key is turned from LOCK to RUN. See Battery for more information.

SERVICE BRAKE SYSTEM

If you hear four short chimes along with the brake system warning light and this message alternating with the SERVICE STEER SYSTEM message, the power assist system is not working. You will still be able to steer and brake, but it will be much more difficult. Pull off the road to a safe location and have your vehicle towed for service. See "Brakes," "Brake System Warning Light," and "ABS Brake System Warning Light" in the owner manual Index.

SERVICE STEER SYSTEM

If the SERVICE STEER SYSTEM message is displayed without any chimes, the power assist system will continue to function, but it may be more difficult to steer. Have the steering system serviced as soon as possible. Also, see "SERVICE BRAKE SYSTEM" listed previously.

Warning 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. If there is more than one message that needs to be displayed they will appear one after another. Some messages may not require immediate action but you should press the select button, or the reset stem, to acknowledge that you received the message and clear it from the display. Some messages cannot be cleared from the display because they are more urgent. These messages require action before they can be removed from the DIC display. The following are the possible messages that can be displayed and some information about them.

BATTERY NOT CHARGING

If the battery is not charging during operation, this message will appear on the DIC. Driving with this problem could drain your battery. Have the electrical system checked as soon as possible. Press the select button to acknowledge the message and clear it from the DIC display. See Battery Warning Light .

BUCKLE SEATBELT

If your vehicle is equipped with the passenger sensing system, this message reminds you to buckle the driver's and/or passenger's seatbelt. See Passenger Sensing System . The message will come on when the ignition is in RUN and the following conditions occur:

    • The driver's seatbelt is unbuckled.
    • The driver's seatbelt is unbuckled and the passenger's seatbelt is unbuckled with the passenger airbag enabled.

Press the select button to acknowledge the message and clear it from the DIC display.

BUCKLE PASSENGER

If your vehicle is equipped with the passenger sensing system, this message reminds you to buckle the passenger's seatbelt. See Passenger Sensing System . This message will come on and a chime will sound when the ignition is in RUN and the driver's seatbelt is buckled and the passenger's seatbelt is unbuckled with the passenger airbag enabled. Press the select button to acknowledge this message and clear it from the DIC display.

CARGO LAMP ON

If the cargo lamp is on, this message will appear on the DIC and you will hear a chime. Turn off the vehicle and check the liftgate. Restart the vehicle and check for the message on the DIC display. Press the select button to acknowledge the message and clear it from the DIC display.

CHECK OIL LEVEL

If your vehicle is equipped with an oil level sensor, and the oil level in the vehicle is low, this message will appear on the DIC. Check the oil level and correct it as necessary. You may need to let the vehicle cool or warm up and cycle the ignition to be sure this message will clear. Once the problem is corrected, pressing the select button will clear this message from the DIC display. See Engine Oil .

CHECK WASHER FLUID

If the washer fluid level is low, this message will appear on the DIC. Adding washer fluid will clear the message. Press the select button to acknowledge the message and clear it from the DIC display. See Windshield Washer Fluid .

CHANGE ENGINE OIL

This message is displayed when the engine oil needs to be changed.

When you change the engine oil, be sure to reset the CHANGE ENGINE OIL message. See Scheduled Maintenance for more information.

DRIVER DOOR AJAR

If the driver's door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display.

ENGINE COOLANT HOT

If the cooling system temperature gets hot, this message will appear in the DIC. Stop the vehicle and let the engine idle in PARK (P), or FIRST (1) for manual transmissions, to allow the coolant to reach a safe temperature. This message will clear when the coolant temperature drops to safe operating temperature.

ENGINE OVERHEATED

If the engine cooling system reaches unsafe temperatures for operation, this message will appear in the DIC and you will hear a chime. Stop and turn off the vehicle as soon as it is safe to do so to avoid severe damage. This message will clear when the engine has cooled to a safe operating temperature.

FUEL LEVEL LOW

If the fuel level is low, this message will appear on the DIC and you will hear a chime. Refuel as soon as possible. Press the select button to acknowledge the message and clear it from the DIC display. See Fuel Gage .

KEYFOB X BATTERY LOW

If a remote keyless entry transmitter battery is low, this message will appear on the DIC. The battery needs to be replaced in the transmitter. Press the select button to acknowledge the message and clear it from the DIC display. See Remote Keyless Entry (RKE) System Operation .

LEFT REAR DOOR AJAR (Crew Cab)

If the driver's side rear door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display.

LOW COOLANT LEVEL

If your vehicle is equipped with a low coolant level sensor, this message will appear on the DIC if the engine coolant level is low. Adding coolant will clear the message.

OIL PRESSURE LOW

If low oil pressure levels occur, this message will be displayed on the DIC and a chime will sound. 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 as soon as possible and have your vehicle serviced. See Engine Oil .

OIL LIFE RESET

This message will appear on the display for about 10 seconds after resetting the change engine oil message.

PASSENGER DOOR AJAR

If the passenger's door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display.

RANGE SHIFT INHIBITED (Allison Transmission Only)

If the transmission is unable to shift into a selected gear this message will appear on the DIC. The electronic shift position indicator on the instrument panel cluster may blink when this occurs. To make the vehicle shift to the requested gear you may have to shift back to PARK (P) or NEUTRAL (N) and re-select the desired gear.

REDUCED ENGINE POWER

This message is displayed when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode.

See Engine Overheating for further information.

RIGHT REAR DOOR AJAR (Crew Cab)

If the passenger's side rear door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display.

SERVICE AIRBAG

If there is a problem with the air bag system, this message will be displayed on the DIC. Have a qualified technician inspect the system for problems. Press the select button to acknowledge the message and clear it from the DIC display.

SERVICE BRAKE SYSTEM

If there is a problem with the brake system, this message will be displayed on the DIC. If this message appears, stop as soon as possible and turn off the vehicle. 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 brake system needs service.

SERVICE BRAKE BOOSTER

If your vehicle has vaccum assist power brakes, this message will be displayed on the DIC when there is a problem with the Supplemental Brake Assist system. If the message is displayed immediately after starting the vehicle or the message appears while driving, your Supplemental Brake Assist system needs service. See Brake System Warning Light .

Caution: Your brake system may not be working properly if the SERVICE BRAKE BOOSTER message is displayed.

If the brake system warning light is also on, you should have the vehicle towed for service. See Brake System Warning Light .

If the brake system warning light is not on, you still have brakes, but the supplemental brake assist system may not operate properly. In the event of a vacuum loss, you may not have vacuum power assist for braking. The brake pedal will be harder to push and it will take longer to stop. If you continue to drive with this message displayed it can lead to a crash. Have the brake system serviced as soon as possible.

SERVICE 4 WHEEL STEER

If a problem occurs with the 4-wheel steer system, this message will appear on the DIC. If this message appears, stop as soon as possible, and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed, or appears again when you being driving, the four-wheel steer system needs service.

SERVICE 4WD

If a problem occurs with the four-wheel drive system, this message will appear on the DIC. If this message appears, stop as soon as possible and turn off the vehicle. 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.

SERVICE RIDE CONTROL

If a problem occurs with the suspension system, this message will appear on the DIC. If this message appears, stop and turn off the vehicle. 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 air suspension system needs service.

TIGHTEN FUEL CAP

If the vehicle's fuel cap is not tightened properly this message may appear along with the check engine light on the instrument panel. See Malfunction Indicator Lamp . Fully reinstall the fuel cap. See Filling the Tank . 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 and message off.

TRACTION ACTIVE

When the traction control system has detected that any of the vehicle's wheels are slipping, the traction control system will activate and this message will appear on the DIC. For more information see "Traction Assist" in the Index. Traction Assist System (TAS) .

TRANSMISSION HOT

If the transmission fluid temperature becomes high, the message center will display this message.

When the transmission enters the protection mode, you may notice a change in the transmission shifting patterns. When the transmission fluid temperature returns to normal, the display will turn off and the transmission shifting patterns will return to normal.

Notice: If you drive your vehicle while the transmission fluid is overheating and the transmission temperature warning is displayed on the instrument panel cluster and/or DIC, you can damage the transmission. This could lead to costly repairs that would not be covered by your warranty. Do not drive your vehicle with overheated transmission fluid or while the transmission temperature warning is displayed.

The following situations can cause the transmission to operate at higher temperatures:

    • Towing a trailer
    • Hot outside air temperatures
    • Hauling a large or heavy load
    • Low transmission fluid level
    • High transmission fluid level
    • Restricted air flow to the radiator and the auxiliary transmission oil cooler.

A temporary solution to hotter transmission operating temperatures may be to let the transmission cool down. If the transmission is operated at higher temperatures on a frequent basis, see Scheduled Maintenance for the proper transmission maintenance intervals. Also see Transmission Temperature Gage for more information.

TRANS HOT IDLE ENGINE (Allison Transmission Only)

If the transmission fluid in the vehicle gets hot, this message will appear on the DIC, and you will hear a chime. The chime will stop when the transmission fluid temperature is less that 265°F (129°C). Driving with the transmission fluid temperature high can cause damage to the vehicle. Stop the vehicle and let it idle to allow the transmission to cool. This message will clear when the fluid temperature reaches a safe level. See Transmission Temperature Gage .

Notice: If you drive your vehicle while the transmission fluid is overheating and the transmission temperature warning is displayed on the instrument panel cluster and/or DIC, you can damage the transmission. This could lead to costly repairs that would not be covered by your warranty. Do not drive your vehicle with overheated transmission fluid or while transmission temperature warning is displayed.

TURN SIGNAL ON

If a turn signal is left on for 3/4 of a mile (1.2 km), this message will appear on the display and you will hear a chime. Move the turn signal/multifunction lever to the off position. Press the select button to acknowledge the message and clear it from the DIC display.