U01BBLost Communication With Battery Charger Control Module B
- Generic OBD-II code · Network
- How the car detects it
- Battery charger control module B is, by its name, a second on-board charger, as fitted on some electric cars to raise AC charging power. Polestar uses the code differently: Technical Journal 37630 (2026, vehicle type 359 from model year 2025) lists U01BB00 in the central computer GCCC when its only AC charger, the grid-to-HV converter GHCA, has failed. In that case AC charging stops while DC fast charging still works, and the converter is diagnosed and replaced. So the letter does not always mean a physical second unit. CARB 1968.2 makes plug-in vehicles responsible for spotting charger faults that block charging or reduce its rate. Expect a charging fault message and no AC charging; U019B and U027A cover chargers A and C, U04BE invalid data from B.
- What you may notice
- AC charging impossible while DC fast charging works
- Charging fault message or charge port LED error
- Likely causes
- LikelyOn-board charger unit failed (Polestar GHCA replaced)
- PossibleCharger without 12 V supply, ground or wake-up signal
- RareBus wiring or connector at the charger damaged
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.