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Speedometer And/Or Odometer Inoperative

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to DLC and attempt to communicate with PCM. If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to diagnostic system check in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. If scan tool shows that DTC P0500 or P0608 are set in PCM, go to diagnostic system check in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no PCM DTCs are set, go to next step.
  4. Using scan tool, select IPC SPECIAL FUNCTIONS. Perform gauge sweep. If speedometer moves from minimum to maximum and back to minimum reading, go to next step. If speedometer does not respond correctly, go to step  9 .
  5. Select IPC data display on scan tool. Observe VEHICLE SPEED parameter. Test drive vehicle and monitor vehicle speed. If scan tool displays correct vehicle speed, go to next step. If scan tool does not display correct vehicle speed, go to step  7 .
  6. Compare scan tool display and instrument panel cluster gauge vehicle speed readings. If readings are within 3 MPH (4.8 km/h), system is operating okay at this time. If readings are not within 3 MPH (4.8 km/h), go to step  9 .
  7. Select PCM data display on scan tool. Test drive vehicle and monitor vehicle speed. If scan tool displays correct vehicle speed, go to next step. If scan tool does not display correct vehicle speed, go to diagnostic system check in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  8. Check for open, short to ground or short to voltage in Dark Green/White wire between PCM and IPC. See WIRING DIAGRAMS  . If faulty circuit is found and repaired, go to step  10 . If circuit is okay, go to next step.
  9. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  10. Turn ignition off and reconnect all disconnected components and connectors. Turn ignition on. Go to GAUGE FUNCTION SYSTEM CHECK  under SYSTEM TESTS. If symptom still exists, return to step  2 .
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