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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Verification

Circuit/System Verification

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  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 vehicle drive wheels.
  3. Engine ON, transmission in drive or 1st gear, 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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