P0649low severityPowertrain
Speed Control Lamp Control Circuit
on 2007 Mercedes-Benz S65 AMG 6.0L V12 BiTurbo M275 · RWD
What this code means
The PCM detected a fault in the cruise control indicator lamp circuit. The cruise control lamp may not illuminate as expected.
Symptoms
- Cruise control lamp not working
- No cruise status indication
- Check engine light on
Common causes
- Faulty cruise indicator lamp
- Wiring or connector damage
- Failed instrument cluster
- PCM driver fault
Diagnostic steps
- Retrieve stored codes
- Inspect lamp and wiring
- Measure control circuit voltage
- Check cluster and PCM signal
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