Powertrain
generic / SAE
P0601
Internal Control Module Memory Check Sum Error
The ECU's internal memory checksum does not match the expected value at startup — the firmware/calibration in flash has become corrupt. Often appears after a failed flash, low battery during programming, or genuine module hardware failure.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 01
Possible causes
- Failed flash / interrupted programming medium
- Module hardware failure medium
- Module software outdated, reflash may resolve low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–2000 €
- Estimated time: 0.5–6 h
- Component: ecm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012