OBD-II code · Powertrain (generic)
P0B2A Hybrid/EV Battery B Voltage High
The voltage of HV battery B exceeds the expected window. Charging overvoltage or sense fault. Cell-group voltage monitoring is the foundation of HV battery safety — drift here triggers contactor opening, charge inhibit, and reduced power to protect the pack.
Is it safe to drive with P0B2A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCharging system overvoltage
- PossibleSense circuit drifted high
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery B, Bms
Related codes
- P0B26Hybrid/EV Battery A Voltage High
- P0B2EHybrid/EV Battery C Voltage High
- P0B32Hybrid/EV Battery D Voltage High
- P0B27Hybrid/EV Battery B Voltage
- P0B28Hybrid/EV Battery B Voltage Unstable
- P0B29Hybrid/EV Battery B Voltage Low
- P0B2BHybrid/EV Battery C Voltage
- P0B2CHybrid/EV Battery C Voltage Unstable
- P0B2DHybrid/EV Battery C Voltage Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.