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

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    YES  - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck (see PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT  ).

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

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