Code result
P0603
Internal Control Module Keep Alive Memory (KAM) Error
Moderate severity
What it means
The ECU detected a fault in its KAM (battery-backed memory used to store adaptations and DTCs). Often appears after battery disconnect or low battery; persistent codes indicate an internal ECU fault.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Battery disconnected or voltage too low
highOne of the most commonly reported causes for this code — check this first.
ECU internal memory fault
lowLess common, but worth ruling out after the more likely causes.
Module software outdated, reflash may resolve
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0603 freeNo credit card required