P0804low severityPowertrain
1-4 Upshift (Skip Shift) Lamp Control Circuit
on 2007 Mercedes-Benz S65 AMG 6.0L V12 BiTurbo M275 · RWD
What this code means
A fault has been detected in the 1-4 upshift (skip shift) lamp control circuit on the instrument cluster. The warning lamp may not illuminate correctly to indicate skip shift operation.
Symptoms
- Skip shift lamp inoperative or stays on
- Check engine light on
- No shift indication to driver
Common causes
- Burned out skip shift indicator bulb
- Open or short in lamp circuit wiring
- Faulty instrument cluster
- Faulty PCM output driver
Diagnostic steps
- Scan for stored codes
- Inspect lamp circuit wiring and connectors
- Test indicator bulb or LED operation
- Verify PCM command and cluster function
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