DTC P0603: ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error

1. Turn the ignition switch ON (II).

1. Clear the DTC with the HDS.

1. Wait 1 second.

1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Is DTC P0603 indicated?

YES | - | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM /PCM.■
NO | - | Intermittent failure, system is OK at this time.■