Transmission

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, and review General Troubleshooting Information.

1. Clear the DTC with the HDS.
2. Turn the ignition switch ON (II).
3. Check whether the DTC P2123 is indicated in the DTCs/Freeze Data in PGM-FI Mode Menu with the HDS.
Is DTC P2123 indicated in the PGM F/system?
YES - Troubleshoot for DTC P2123 in the PGM-FI System.
NO - Go to step 4.

4. Check whether the DTC P2123 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P2123 indicated?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck for DTC P2123. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Intermittent failure, the system is OK at this time.