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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 985 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, perform the speedometer gage sweep test with the scan tool. Verify that the speedometer gage sweeps from its low to high position.
    • If the speedometer gage 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.
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