P2BD0Battery Charging System Negative Contactor B Control Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- With P2BD0 the coil drive line of minus-side charging contactor B is too low – usually insulation damage letting the wire touch the body, or an output stage stuck low. Starved of current, the coil leaves the return path of that charging branch open. No manufacturer documents P2BD0 publicly. GM states that its open-circuit test (P0D11) on the Volt and ELR minus contactor A cannot see a short to ground, so that case has to be caught elsewhere. CARB obliges makers of plug-in vehicles to check this hardware. Look for chafed wiring along the battery tray or underbody, moisture in connectors and an internally shorted coil. The high counterpart is P2BD1, the plus side P2BC9, the contactor A twin P0D13. The vehicle will normally not charge in that mode.
- What you may notice
- Charging session will not start
- Charging fault message
- Likely causes
- LikelyControl wire of negative contactor B shorted to ground
- PossibleMoisture in a connector of the control line
- RareCoil of negative contactor B internally shorted
- 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.