DTC Troubleshooting: P0603 (131)

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

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Wait 1 second.

4.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs 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.n


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