P0D91 code meaning
Battery Charger Coupler Lock Control Circuit/Open
Powertrain system Generic code P0Dxx codes Check engine light
What P0D91 means
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 Without a confirmed lock, the car normally refuses to start a charging session, because the plug could be withdrawn under load.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.
P0D91 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0D91
- Vehicle does not charge on AC
- Check engine light on (Mercedes)
- Charging system warning in the instrument cluster
Common causes of P0D91
- Most 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
- Less likelyDriver stage or software of the controlling module (Mercedes names both)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Charge port lock actuatorWiring harnessOn board charger
What each part of P0D91 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 91 | The exact fault in that area. |
What to do next
- Note P0D91 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0D91
What does P0D91 mean?
P0D91 means "Battery Charger Coupler Lock Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D91?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0D91 fail an emissions test?
P0D91 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D91 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P0D91 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.