GM Service Manual Online
For 1990-2009 cars only

The Instrument Panel Cluster (IPC) is equipped with a 20 character vacuum fluorescent display feature. This feature provides the driver with specific warning/status messages associated with certain vehicle malfunctions and/or instructions to perform. Warning messages are displayed in a ranked priority, with the higher priority messages (priority 1) displayed first. If the ignition is cycled, the IPC will display the last message before the ignition was cycled. Many messages coincide with indicators and Diagnostic Trouble Codes (DTCs) that may be set. DTCs must always be diagnosed first prior to diagnosing any warning messages. Unlike other vehicle electronic systems, such as PCM, SIR, etc., some systems have no specific ERROR lamp to indicate a malfunction. A DTC-setting malfunction in any system connected to the serial data line may be indicated by a specific message displayed in the IPCs display. Other system malfunctions will only set a DTC and will not display a message. Refer to the applicable DTC table for a description on how each DTC set and how it will be indicated. Warning messages will be displayed in all display modes except configuration and Diagnostic modes. When a warning message is displayed, the message overwrites any current displays. The IPC will continue to display this message until the system that requested the message sends a "Stop Broadcasting" Message on the serial data line to the IPC. Warning message may also be acknowledged/cleared by pressing the RESET button when that message is displayed except if a system requests a continuous message display. The following table indicates possible messages that may be displayed by the IPC and what system is responsible for sending the request:

Warning/Status Message Display Diagnosis

Warning/Status Message

Message Source

Diagnosis

LOW OIL PRESSURE

PCM

Instrument Panel, Gauges and Console and Engine Controls

HIGH OIL TEMPERATURE REDUCE ENGINE RPM

IPC

Instrument Panel, Gauges and Console

ENGINE PROTECTION REDUCE ENGINE RPM

PCM

Engine Controls

UPSHIFT NOW!

PCM

Engine Controls

COOLANT OVER TEMP

PCM

Engine Cooling and Engine Controls

REDUCED ENGINE POWER

PCM

Engine Controls

SHOCKS INOPERATIVE

RTD

Real Time Damping

MAXIMUM SPEED 129 Km/h (80 mph)

PCM/RTD

Engine Controls and Real Time Damping

HIGH TRANS TEMP

PCM

Instrument Panel, Gauges and Console

FLAT TIRE-LF MAX SPD 55, REDUCED HNDLG

RFA/TPM

Tire Pressure Monitoring

FLAT TIRE-RF MAX SPD 55, REDUCED HNDLG

RFA/TPM

Tire Pressure Monitoring

FLAT TIRE-LR MAX SPD 55, REDUCED HNDLG

RFA/TPM

Tire Pressure Monitoring

FLAT TIRE-RR MAX SPD 55, REDUCED HNDLG

RFA/TPM

Tire Pressure Monitoring

OVER SPEED WARNING

IPC/PCM

Instrument Panel, Gauges and Console

HIGH TIRE PRESSURE-LF

RFA/TPM

Tire Pressure Monitoring

HIGH TIRE PRESSURE-RF

RFA/TPM

Tire Pressure Monitoring

HIGH TIRE PRESSURE-LR

RFA/TPM

Tire Pressure Monitoring

HIGH TIRE PRESSURE-RR

RFA/TPM

Tire Pressure Monitoring

LOW TIRE PRESSURE-LF

RFA/TPM

Tire Pressure Monitoring

LOW TIRE PRESSURE-RF

RFA/TPM

Tire Pressure Monitoring

LOW TIRE PRESSURE-LR

RFA/TPM

Tire Pressure Monitoring

LOW TIRE PRESSURE-RR

RFA/TPM

Tire Pressure Monitoring

LOW OIL LEVEL

PCM

Instrument Panel, Gauges and Console

LOW VOLTAGE

IPC

Engine Electrical and Engine Controls

HIGH VOLTAGE

IPC

Engine Electrical and Engine Controls

LOW BRAKE FLUID

IPC

Brakes

CHANGE OIL NOW

PCM

General Information

SERVICE TRACTION SYSTEM

ABS

Anti Lock Brake System

SERVICE COLUMN LOCK

BCM

Steering

PULL KEY-WAIT 10 SEC

BCM

Steering

SERVICE RIDE CONTROL

RTD

Real Time Damping

SERVICE TIRE MONITOR

RFA/TPM

Keyless Entry and Tire Pressure Monitor

CHARGE SYSTEM FAULT

PCM

Engine Electrical

SERVICE VEHICLE SOON

PCM, BCM, ABS, RFA, RTD

Instrument Panel, Gauges and Console

LOW FUEL

PCM

Instrument Panel, Gauges and Console

LOW WASHER FLUID

IPC

Wipers/Washer Systems

HATCH AJAR

BCM

Body Rear End

TRUNK AJAR

BCM

Body Rear End

DOOR AJAR

BCM

Doors

TONNEAU AJAR

BCM

Body Rear End

RESERVE FUEL

PCM

Instrument Panel, Gauges and Console

CHANGE OIL SOON

PCM

General Information

CRUISE SET XX Km/h (XX mph)

PCM

Cruise Control

CRUISE DISENGAGED

PCM

Cruise Control

BRAKE BEFORE SHIFT

IPC

Brakes

TRACTION SYSTEM - ON/OFF

ABS

Anti Lock Brake System

TRAC/ACT HNDLG - ON/OFF

ABS

Anti Lock Brake System

COMPETITIVE DRIVING

ABS

Anti Lock Brake System

TRACTION SYS ACTIVE

ABS

Anti Lock Brake System

ABS ACTIVE

ABS

Anti Lock Brake System

ACTIVE HANDLING

ABS

Anti Lock Brake System

ACT HNDLG - WARMING UP

ABS

Anti Lock Brake System

WARM UP COMPLETE

ABS

Anti Lock Brake System

ACT HNDLG PERF LIMIT

ABS

Anti Lock Brake System

SERVICE ABS

ABS

Anti Lock Brake System

SERVICE ACTIVE HNDLG

ABS

Anti Lock Brake System