P0CD4Charge Port Door A Unlock Control Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P0CD4 is the high-level variant of the charge flap A unlock output fault. The control line reads high when the driver should be pulling it low or holding it off, as happens with a short to a 12 V wire, and on many low-side drivers also with an open actuator or broken wire. A flap actuator that is powered all the time may overheat, while an open one simply never releases. No manufacturer documents this code publicly; GM's Volt tables cover short to battery and open circuit within P0CD1. A Tesla patent describes the same principle, in which a controller closes a switch to supply the flap release actuator. CARB 13 CCR 1968.2 (e)(15) explains why comfort outputs like this rarely receive split low and high codes. Siblings: P0CD3 for low, P0CD2 for the movement check.
- What you may notice
- Charge flap does not unlock or unlocks unexpectedly
- Actuator may become hot from continuous current
- Likely causes
- LikelyActuator control wire shorted to a 12 V feed
- PossibleOpen actuator winding or broken wire
- RareOutput driver in the control module damaged
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.