Powertrain
generic / SAE
P0604
Internal Control Module Random Access Memory (RAM) Error
ECU self-test detected a RAM fault during runtime checks. This is an internal ECU defect; replacement or reflash with manufacturer support is generally required.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 04
Possible causes
- ECU internal RAM fault high
- Module software outdated, reflash may resolve low
- Supply voltage outside specification 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: 400–2000 €
- Estimated time: 1–4 h
- Component: ecm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012