P2D76Battery Charging System Negative Contactor D Control Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D76 means the control wire of minus contactor D shows more voltage than the module asked for. No manufacturer documents P2D76 publicly. GM's 2016 test for the minus charge contactor (P0D11) flags a power short when the idle output gets within 0.4 V of the supply. The effect hinges on which coil end is switched, which a GM patent leaves open: on a ground-side switched coil, a short to supply at the switched end means both coil ends sit at the same potential, so contactor D never pulls in and the driver may see overcurrent when it turns on; on a supply-side switched coil the contactor may close by itself. Either way charging via path D stops. P2D75 is the low case, P2D6F the plus side, P2D68 contactor C.
- What you may notice
- Charging mode via contactor D blocked
- Fault appears as soon as ignition is on
- Charging or high-voltage warning
- Likely causes
- LikelyDrive wire of contactor D touching a 12 V feed
- PossibleOutput stage that no longer switches off
- RareCrossed wires after work on the battery
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.