P0650moderate severityPowertrain
Malfunction Indicator Lamp (MIL) Control Circuit
on 2009 Audi A8 4.2L V8 · AWD
What this code means
The PCM detected a fault in the malfunction indicator lamp control circuit. The MIL may fail to illuminate or may stay on incorrectly.
Symptoms
- Check engine light won't turn on
- MIL stuck on
- Failed emissions inspection
Common causes
- Burned out MIL bulb
- Wiring or connector fault
- Faulty instrument cluster
- PCM driver circuit failure
Diagnostic steps
- Scan for stored codes
- Inspect MIL bulb and wiring
- Test control circuit voltage
- Check cluster and PCM output
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