A/T System

DTC Troubleshooting: P2123 (20) (A/T System)

DTC P2123: Accelerator Pedal Position (APP) Sensor A (Throttle Position Sensor D) Circuit High Voltage Input

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information. How To Troubleshoot A/T Systems (A/T)

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

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs in the PGM-FI SYSTEM with the HDS.

Is DTC P2123 indicated in the PGM-FI SYSTEM?
YES - Go to the DTC P2123 troubleshooting in the Electronic Throttle Control System (ETCS). P2123

NO - Go to step 4.


4. Check for Temporary DTCs or DTCs in the A/T SYSTEM with the HDS.

Is DTC P2123 indicated in the A/T SYSTEM?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs were indicated, go to the indicated DTC's troubleshooting.


5. Update the PCM if it does not have the latest software, ECM/PCM Update (A/T) or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

6. Start the engine, and wait for at least 2 minutes.

7. Check for Temporary DTCs or DTCs the A/T SYSTEM with the HDS.

Is DTC P2123 indicated in the A/T SYSTEM?
YES - Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 6. If the PCM was substituted, go to step 1.

NO - Go to step 8.


8. Monitor the OBD STATUS for P2123 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Temporary DTCs or DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 6. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 6.