P2BEBHybrid/EV Battery Precharge Contactor Control Circuit B High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BEB reports too much voltage on control circuit B of the precharge function while it should be off, usually a short to 12 V or a driver that does not switch off. The risk is a second precharge path closing on its own; the resistor can overheat if it stays in circuit. No manufacturer documents P2BEB publicly. For contactor A, GM's 2016 table (P0AE7) fails the off-state output between 5.27 and 19.7 V, 40 of 50 samples at 12.5 ms, Type B, two trips; in 2019 GM folds this case into P0AE4, set when the off-state output exceeds battery voltage minus 0.4 V. A coil stuck energised may later show up as a contactor that stays closed. CARB requires circuit monitoring of hybrid outputs. Low and open are P2BEA and P2BE8.
- What you may notice
- MIL and hybrid or EV warning on
- High-voltage system blocked as a precaution
- Likely causes
- LikelyCoil feed shorted to 12 V
- PossibleDriver stage stuck on in the battery controller
- RareDamaged insulation between adjacent wires in the harness
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.