16989high severityPowertrain
Internal Control Module Memory Check Sum Error
on 2009 Audi A8 4.2L V8 · AWD
What this code means
The engine control module detected a memory checksum error (OBD P0605). This points to an internal ECU fault or corrupted programming.
Symptoms
- Check engine light
- Poor drivability
- No-start condition
Common causes
- Corrupted ECU software
- Internal ECU fault
- Failed programming/flash
- Power supply issue
Diagnostic steps
- Read fault codes
- Check ECU power and grounds
- Reflash or update software
- Replace ECU if faulty
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