P2BCBBattery Charging System Negative Contactor B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2BCB is the general electrical code for negative contactor B of the charging system, which closes the return path of the second charging branch to the traction battery. No manufacturer documents P2BCB publicly. Where B serves DC fast charging, each pole usually has its own contactor so the inlet is isolated from the pack whenever no charger is connected; a Hyundai patent on quick-charge relays tests the plus and minus relay one after the other for exactly that reason. A Ford patent swaps the order in which the two charger contactors close from one session to the next and checks the last one closed for welding first. CARB requires monitoring of charging components on plug-in vehicles. Stuck closed and open are P2BCC/P2BCD, driver faults P2BCE–P2BD1, the plus side P2BC4, contactor A minus P0D0E.
- What you may notice
- Charging in the affected mode refused
- Charging fault message
- Driving usually still possible
- Likely causes
- PossibleCoil of negative contactor B open or shorted
- PossibleWiring or connector fault on the return-side contactor
- RareFault in the module that drives contactor B
- 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.