DTC Troubleshooting

DTC Troubleshooting: P0463

DTC P0463: Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit High Voltage

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

1. Turn the ignition switch to 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 P0463 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 to LOCK (0).

5. Remove the rear seat cushion. Rear Seat Removal/Installation

6. Remove the rear floor upper cross-member and the access panel from the floor. Fuel Tank Unit Removal and Installation

7. Disconnect the fuel tank unit 4P connector.

8. Connect fuel tank unit 4P connector terminal No. 3 to body ground with a jumper wire.






9. Remove the gauge control module (tach). Gauge Control Module Replacement

10. Disconnect the gauge control module (tach) 36P connector.

11. Check for continuity between gauge control module (tach) 36P connector terminal No. 33 and body ground.

Is there continuity?
YES - Go to step 12.

NO - Repair open in the wire between the gauge control module (tach) (GND line) and the fuel gauge sending unit, then go to step 24.






12. Connect fuel tank unit 4P connector terminal No. 1 to body ground with a jumper wire.






13. Check for continuity between gauge control module (tach) 36P connector terminal No. 32 and body ground.

Is there continuity?
YES - Go to step 14.

NO - Repair open in the wire between the gauge control module (tach) (signal line) and the fuel gauge sending unit, then go to step 24.






14. Remove the jumper wire from the fuel tank unit 4P connector.

15. Remove the fuel tank unit. Fuel Tank Unit Removal and Installation

16. Test the fuel gauge sending unit. Testing and Inspection

Is the fuel gauge sending unit OK?
YES - Go to step 17.

NO - Replace the fuel gauge sending unit, Fuel Pump/Fuel Gauge Sending Unit Replacement then go to step 23.


17. Connect the fuel tank unit 4P connector.

18. Reconnect the gauge control module (tach) 36P connector.

19. Turn the ignition switch to ON (II).

20. Clear the DTC with the HDS.

21. Set the float (A) to the F position.

22. Check the fuel gauge.

Does the gauge move to the full position?
YES - Go to step 30.

NO - Replace the gauge control module (tach), Gauge Control Module Replacement then go to step 23.






23. Turn the ignition switch to LOCK (0).

24. Reconnect all connectors.

25. Install the parts in the reverse order of removal.

26. Turn the ignition switch to ON (II).

27. Reset the ECM with the HDS.

28. Do the ECM idle learn procedure. ECM Idle Learn Procedure

29. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0463 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 DTC's troubleshooting.


30. Reconnect all connectors.

31. Install the parts in the reverse order of removal.

32. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

33. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0463 indicated?
YES - Check for poor connections or loose terminals at the gauge control module (tach) and the fuel gauge sending unit. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.