## DTC Troubleshooting: P0603 (0), P0604 (0), P0605 (0)

DTC P0603: | ECM Internal Control Module Keep Alive Memory (KAM) Error
DTC P0605: | ECM Internal Control Module Read Only Memory (ROM) Error

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

2. | Do the DTC CLEAR in the CLEAR MENU with the HDS.

3. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC P0603, P0604 and/or P0605 indicated? YES - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.n NO - Intermittent failure, system is OK at this time.n