Powertrain
generic / SAE
P0605
Internal Control Module Read Only Memory (ROM) Error
ECU self-test detected a ROM/checksum failure on the program memory. The control software cannot be trusted; vehicle typically defaults to limp-home with reduced function.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 05
Possible causes
- ECU internal ROM 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- Module software outdated, reflash may resolve low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