P2D63Battery Charging System Negative Contactor C Stuck Closed
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P2D63 says negative charging contactor C has not opened on command; the return-side contacts are almost certainly fused. No manufacturer documents P2D63 publicly, and the Mercedes and Mazda bulletins that report a welded minus contactor B (P2BCC) do not mention C. Detection relies on isolating one pole at a time: Toyota opens the minus charge relay while the plus relay stays closed and treats it as stuck if the charging inlet voltage stays above a threshold; it repeats the test with the main relays open to exclude a charger that keeps supplying power. Hyundai uses the same pairing at the end of quick charging. With a welded minus pole the inlet is no longer isolated on that side, so the module blocks the path. P2D64 is the opposite fault, P2D5C the plus side.
- What you may notice
- Charging blocked after a session
- High-voltage warning at start-up
- Vehicle may not become ready if the plus side is welded too
- Likely causes
- LikelyFused main contacts of minus contactor C
- RareCharger still supplying voltage during the check (false detection)
- RareCoil output stage stuck on
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.