GM Service Manual Online
For 1990-2009 cars only

Important: The following steps must be completed before using the symptom tables.

  1. Perform Diagnostic System Check - Instrument Cluster before using the Symptom Tables in order to verify that all of the following are true:
  2. • There are no DTCs set.
    • The control module(s) can communicate via the serial data link.
  3. Review the system operation in order to familiarize yourself with the system functions. Refer to:
  4. •  Instrument Cluster Gauge Operation
    •  Instrument Cluster Indicator Operation
    •  Audible Warnings Description

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the Instrument Panel, Gauges, and Console System. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Engine Coolant Temperature Gauge Always Cold
    •  Engine Coolant Temperature Gauge Always Hot
    •  Engine Oil Pressure Gauge Always High
    •  Engine Oil Pressure Gauge Always High
    •  Engine Oil Pressure Gauge Always Low
    •  Engine Oil Pressure Gage Inaccurate or Inoperative
    •  Fuel Gage Inaccurate or Inoperative
    •  Odometer Inoperative
    •  Odometer Inoperative - Trip
    •  Speedometer and/or Odometer Inoperative
    •  Tachometer Inoperative
    •  Volt Gage Inaccurate or Inoperative
    •  CHANGE ENGINE OIL Indicator Always On
    •  CHANGE ENGINE OIL Indicator Inoperative
    •  CHECK GAGES Indicator Always On
    •  CHECK GAGES Indicator Inoperative
    •  Low Engine Oil Level Indicator Always On
    •  Low Engine Oil Level Indicator Inoperative
    •  REDUCED ENGINE POWER Indicator Always On
    •  REDUCED ENGINE POWER Indicator Inoperative
    •  Speedometer Inaccurate (J 38522 Available)
    •  Speedometer Inaccurate (J 38522 Unavailable)
    •  Key-in-Ignition Chime Always On
    •  Key-in-Ignition Chime Inoperative
    •  Key-in-Ignition Chime On with Left Front Door Closed
    •  Lights On Chime On with Ignition in Run
    •  Lights On Chime Inoperative