OBD-II code · Powertrain (generic)
P0B51 Hybrid/EV Battery Voltage Sense E Circuit Low
The BMS detects a circuit low fault on voltage sense channel E of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
Is it safe to drive with P0B51?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySense wire shorted to ground
- PossibleOpen in sense wire
- Less likelyConnector pins corroded - high contact resistance
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 E, Wiring Harness, Bms
Related codes
- P0B3DHybrid/EV Battery Voltage Sense A Circuit Low
- P0B42Hybrid/EV Battery Voltage Sense B Circuit Low
- P0B47Hybrid/EV Battery Voltage Sense C Circuit Low
- P0B4CHybrid/EV Battery Voltage Sense D Circuit Low
- P0B56Hybrid/EV Battery Voltage Sense F Circuit Low
- P0B5BHybrid/EV Battery Voltage Sense G Circuit Low
- P0B60Hybrid/EV Battery Voltage Sense H Circuit Low
- P0B65Hybrid/EV Battery Voltage Sense I Circuit Low
- P0B6AHybrid/EV Battery Voltage Sense J Circuit Low
- P0B6FHybrid/EV Battery Voltage Sense K Circuit Low
- P0B74Hybrid/EV Battery Voltage Sense L Circuit Low
- P0B79Hybrid/EV Battery Voltage Sense M Circuit Low
- P0B4EHybrid/EV Battery Voltage Sense D Circuit Intermittent/Erratic
- P0B4FHybrid/EV Battery Voltage Sense E Circuit
- P0B50Hybrid/EV Battery Voltage Sense E Circuit Range/Performance
- P0B52Hybrid/EV Battery Voltage Sense E Circuit High
- P0B53Hybrid/EV Battery Voltage Sense E Circuit Intermittent/Erratic
- P0B54Hybrid/EV Battery Voltage Sense F Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.