What P0603 means
Internal Control Module Keep Alive Memory (KAM) Error
Common causes (general)
Before spending money on parts, verify the code with a scan tool and read freeze frame data. Freeze frame captures every sensor value at the moment the code set — this is often enough to figure out the root cause without further testing.
Manufacturer-specific descriptions
Different manufacturers use this code for slightly different failure modes. Here's what your specific make means by P0603:
| AUDI | Lack of proper voltage to the Keep Alive Memory connection on the PCM, Defective PCM Keep Alive Memory Module (KAM), Defective PCM ground circuit(s), Defective PCM controlled output devices |
| BMW | Internal Control Module Keep Alive Memory (KAM) Error |
| FIAT | Fault redundant memory EEPROM, |
| FORD | Powertrain Control Module KAM Test Error |
| HONDA | ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error |
| MITSUBISHI | Internal Control Module Keep Alive Memory (KAM) Error; EEPROM fail |
| NISSAN | Internal Control Module Keep Alive Memory (KAM) Error |
| VOLKSWAGEN | Control Module Long Term Memory Reset |
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