GM Service Manual Online
For 1990-2009 cars only

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

  1. Perform the Instrument Cluster Diagnostic System Check before using the following 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.
  4. •  Instrument Cluster Operation
    •  Instrument Cluster Gauge Operation
    •  Instrument Cluster Odometer Operation
    •  Instrument Cluster Indicator Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the 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:

    •  Brake Pad Wear Indicator Always On
    •  Brake Pad Wear Indicator Inoperative
    •  Engine Coolant Temperature Gage Inaccurate or Inoperative
    •  Engine Oil Pressure Gauge Always Low
    •  Engine Oil Pressure Gauge Always Low
    •  Engine Oil Pressure Gage Inaccurate or Inoperative
    •  Fuel Gage Inaccurate or Inoperative
    •  Speedometer and/or Odometer Inoperative
    •  Tachometer Inoperative
    •  Fuel Cap Missing Indicator Always On
    •  Fuel Cap Missing Indicator Inoperative
    •  Low Engine Oil Level Indicator Always On
    •  Low Engine Oil Level Indicator Inoperative