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