OBD-II code · Powertrain (generic)
P0B4A Hybrid/EV Battery Voltage Sense D Circuit
The BMS detects a circuit fault on voltage sense channel D of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
Is it safe to drive with P0B4A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySense circuit failed
- PossibleWiring fault
- 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
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Voltage Sense D, Wiring Harness, Bms
Related codes
- P0B3BHybrid/EV Battery Voltage Sense A Circuit
- P0B40Hybrid/EV Battery Voltage Sense B Circuit
- P0B45Hybrid/EV Battery Voltage Sense C Circuit
- P0B4FHybrid/EV Battery Voltage Sense E Circuit
- P0B54Hybrid/EV Battery Voltage Sense F Circuit
- P0B59Hybrid/EV Battery Voltage Sense G Circuit
- P0B5EHybrid/EV Battery Voltage Sense H Circuit
- P0B63Hybrid/EV Battery Voltage Sense I Circuit
- P0B68Hybrid/EV Battery Voltage Sense J Circuit
- P0B6DHybrid/EV Battery Voltage Sense K Circuit
- P0B72Hybrid/EV Battery Voltage Sense L Circuit
- P0B77Hybrid/EV Battery Voltage Sense M Circuit
- P0B47Hybrid/EV Battery Voltage Sense C Circuit Low
- P0B48Hybrid/EV Battery Voltage Sense C Circuit High
- P0B49Hybrid/EV Battery Voltage Sense C Circuit Intermittent/Erratic
- P0B4BHybrid/EV Battery Voltage Sense D Circuit Range/Performance
- P0B4CHybrid/EV Battery Voltage Sense D Circuit Low
- P0B4DHybrid/EV Battery Voltage Sense D Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.