What does P0603 mean?

This code signifies an error with the Keep Alive Memory (KAM) in the Powertrain Control Module (PCM). This memory stores learned values and settings.

• Loss of power to the KAM during engine running
• Internal PCM fault affecting KAM
• Battery voltage too low

Click steps to track your progress.

1. 1

   Check the battery voltage and condition.

2. 2

   Inspect wiring to the PCM for any interruptions.

3. 3

   Allow the vehicle to run for a period to let KAM relearn.

4. 4

   Consider PCM replacement if the error persists.