DTC Troubleshooting

DTC P0462: Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS, and wait 5 seconds.
3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0462 indicated?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module (tach) and the fuel gauge sending unit.

4. Turn the ignition switch OFF.
5. Disconnect the fuel tank unit subharness 4P connector.
6. Turn the ignition switch ON (II).
7. Clear the DTC with the HDS, and wait 5 seconds.
8. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0463 indicated?

YES - Replace the fuel gauge sending unit, then go to step 22.

NO - Go to step 9.

9. Turn the ignition switch OFF.
10. Remove the gauge control module (tach).
11. Disconnect the gauge control module (tach) 36P connector.
12. Check for continuity between floor wire harness C651 4P connector terminal No. 1 and body ground.






Is there continuity?

YES - Repair short in the wire between the gauge control module (tach) (signal line) and the fuel tank unit subharness, then go to step 23.

NO - Go to step 13.

13. Remove the fuel tank.
14. Check the fuel tank unit subharness for an open or short.

Is the harness OK?

YES - Go to step 15.

NO - Repair the fuel tank unit subharness, then go to step 22.

15. Reconnect the gauge control module (tach) 36P connector.
16. Remove the fuel tank unit.
17. Connect the fuel tank unit subharness 4P connector, and the fuel tank unit 4P connector.
18. Turn the ignition switch ON (II).
19. Clear the DTC with the HDS.
20. Set the float (A) to the E position.






21. Check the fuel gauge.

Does the gauge move to the empty position?

YES - Go to step 29.

NO - Replace the gauge control module (tach), then go to step 22.

22. Turn the ignition switch OFF.
23. Reconnect all connectors.
24. Install the parts in the reverse order of removal.
25. Turn the ignition switch ON (II).
26. Reset the PCM with the HDS.
27. Do the PCM idle learn procedure.
28. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0462 indicated?

YES - Check for poor connections or loose terminals at the gauge control module (tach) and the fuel gauge sending unit, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

29. Reconnect all connectors.
30. Install the parts in the reverse order of removal.
31. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
32. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0462 indicated?

YES - Check for poor connections or loose terminals at the gauge control module (tach) and the fuel gauge sending unit. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.