DTC Troubleshooting

DTC Troubleshooting: P2128

DTC P2128: APP Sensor B (TP Sensor E) 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. Check APP SENSOR B in the DATA LIST with the HDS.

Is there about 4.9 V or more?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the APP sensor and the ECM.


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

4. Disconnect the APP sensor 6P connector.

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

6. Measure the voltage between APP sensor 6P connector terminals No. 5 and No. 6.

Is there about 5 V?
YES - Go to step 12.

NO - Go to step 7.






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

8. Jump the SCS line with the HDS.

9. Disconnect ECM connector A (44P).

10. Connect APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.






11. Check for continuity between ECM connector terminal A34 and body ground.

Is there continuity?
YES - Go to step 19.

NO - Repair open in the wire between the ECM (A34) and the APP sensor, then go to step 14.






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

13. Replace the accelerator pedal module. Service and Repair

14. Reconnect all connectors.

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

16. Reset the ECM with the HDS.

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

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

Is DTC P2128 indicated?
YES - Check for poor connections or loose terminals at the APP sensor and the ECM, 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.


19. Reconnect all connectors.

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

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

Is DTC P2128 indicated?
YES - Check for poor connections or loose terminals at the APP sensor and the ECM. 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.