P0D91Battery Charger Coupler Lock Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P0D91 means the module that drives the charge-plug latch sees its lock output as electrically open: when it commands the latch closed, no current flows through the wiring and actuator winding. Without a confirmed lock, the car normally refuses to start a charging session, because the plug could be withdrawn under load. Mercedes-Benz documents P0D9100 in the drivetrain control unit (PTCU, N127) of its recent P3 plug-in hybrids such as the S 580 e and the AMG GT 63 S E and C 63 S E: bulletin LI47.70-P-078127 describes a car that will not charge on AC with the check engine light on and names hardware or software as possible causes still under investigation. Shorts on this output are P0D92/P0D93, a driven but ineffective lock is P0D94, and the release side has P0D95–P0D98.
- What you may notice
- Vehicle does not charge on AC
- Check engine light on (Mercedes)
- Charging system warning in the instrument cluster
- Likely causes
- LikelyConnector at the lock actuator loose, corroded or backed out
- PossibleBroken wire in the harness between control unit and inlet
- PossibleMotor winding inside the lock actuator burnt through
- RareDriver stage or software of the controlling module (Mercedes names both)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.