P2BE8Hybrid/EV Battery Precharge Contactor Control Circuit B Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BE8 reports an open in control circuit B of the battery precharge function, i.e. the coil drive of a second precharge contactor. Note the wording: the letter follows circuit, while the A codes P0AE4 to P0AE7 name contactor A. Such a second path exists, for example, in a Ford patent with one precharge resistor and switch on the positive side and another on the return side, so precharge still works if one main contactor is welded. No manufacturer documents P2BE8 publicly. GM's test for contactor A (P0AE4, 2019) shows the method: with the driver on, a coil current under 194 mA means open, 40 of 50 samples at 12.5 ms, Type B. CARB requires circuit checks of hybrid outputs. Without precharge the vehicle normally does not become ready.
- What you may notice
- Vehicle does not become ready to drive
- MIL and hybrid or EV warning on
- Charging not possible
- Likely causes
- LikelyOpen control wire or loose connector at contactor B
- PossibleCoil of precharge contactor B open internally
- RareDriver stage in the battery controller defective
- 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.