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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 865 (Instrument Panel System Displays And Gauges) >> Diagnostic Information & Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, perform the speedometer gauge sweep test with the scan tool.
    • If the speedometer gauge does not sweep from its low to high position, replace the IPC.
  2. Ignition OFF, raise the vehicles drive wheels.
  3. Engine ON, transmission in drive, verify the scan tool Vehicle Speed Sensor parameter matches the speedometer display.
    • If the Vehicle Speed Sensor parameter does not match the speedometer display, replace the IPC.
  4. Verify that the odometer is operating properly.
    • If the odometer is not operating properly, replace the IPC.
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