DTC Troubleshooting: P2123 (20-4)

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

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 FI system?


YES - Troubleshoot for DTC P2123 in the PGM-FI System.


NO - Go to 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. If the symptom/indication goes away with a known-good PCM, replace the original  PCM.n


NO - Intermittent failure, the system is OK at this time.n