Transmission

DTC P0603: Powertrain Control Module (PCM) Keep Alive Memory (KAM) Error

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. Check whether the DTC P0603 is indicated in the DTCs/Freeze Data in PGM-FI Mode Menu with the HDS.
Is DTC P0603 indicated in the PGM-FI system?
YES - Troubleshoot for DTC P0603 in the PGM-FI System.
NO - Go to stop 3.

3. Check whether the DTC P0603 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P0603 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.
NO - Intermittent failure, the system is OK at this time.