P2BCDBattery Charging System Negative Contactor B Stuck Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P2BCD is set when negative charging contactor B fails to close, so the charging branch lacks its return path and no current can flow even with the plus side connected. No manufacturer documents P2BCD publicly; Mazda lists the welded minus case P2BCC and the non-closing plus case P2BC6 for the CX-90 PHEV, but not this one. GM's Volt test for positive contactor A (P0D09) illustrates how a non-closing contactor shows up: with the charging and precharge contactors commanded on, the charger-side voltage stays below 10 V, and 8 failures in 9 samples end the check. Under CARB rules the charging hardware of plug-in vehicles must be supervised. Typical causes are burnt or contaminated contacts, a weak coil supply and module software. P2BCC is the welded variant, P2BC6 the plus side, P0D10 the contactor A twin. Charging aborts.
- What you may notice
- Charging stops or never starts
- Charging fault message
- Likely causes
- LikelyNegative contactor B burnt or mechanically not closing
- PossibleCoil supply too weak or interrupted
- RareCharging control software misjudging the check
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.