P2D5BBattery Charging System Positive Contactor C Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D5B is the umbrella electrical fault for charging-system contactor C on the plus pole, a third plus-side switch next to contactors A (P0D07) and B (P2BC4). Which charging path C serves is left to each maker, and none states it in public: the bulletins that cite contactor B codes (Mercedes, Mazda, Audi) never mention a C contactor, nor do the published GM tables, and no document lists P2D5B itself. CARB obliges plug-in hybrids to catch charger faults that stop or curb charging. One GM patent assesses this kind of contactor from its coil current after a brief test pulse. Welding and failure to close have their own codes (P2D5C/P2D5D), coil-drive faults P2D5E–P2D61. Expect the charging mode behind C to be unavailable.
- What you may notice
- One charging mode refused or aborted
- Charging or high-voltage warning in the cluster
- Driving otherwise normal
- Likely causes
- PossibleCoil of contactor C open or shorted internally
- PossibleDamaged wiring or loose plug at the contactor or its module
- RareOutput stage or software of the controlling module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.