Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0603: PCM Internal Control Module Keep Alive Memory (KAM) Error
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES -Go to step 4.
NO -Intermittent failure, the system is OK at this time.
- Update the PCM if it does not have the latest, software (see UPDATING THE PCM ), or substitute a known-good PCM (see HOW TO SUBSTITUTE THE PCM ).
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0603 indicated?
YES -If the PCM was updated, substitute a known-good PCM (see HOW TO SUBSTITUTE THE PCM ), then recheck. If the PCM was substituted, go to step 1.
NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.