OBD-II code · Powertrain (generic)
P0B7B Hybrid/EV Battery Voltage Sense M Circuit Intermittent/Erratic
The BMS detects a circuit intermittent/erratic fault on voltage sense channel M of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
Is it safe to drive with P0B7B?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySense connector not seated
- PossibleNoisy ground reference
- Less likelyConnector with intermittent contact under vibration
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 M, Wiring Harness, Bms
Related codes
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- P0B62Hybrid/EV Battery Voltage Sense H Circuit Intermittent/Erratic
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- P0B71Hybrid/EV Battery Voltage Sense K Circuit Intermittent/Erratic
- P0B76Hybrid/EV Battery Voltage Sense L Circuit Intermittent/Erratic
- P0B80Hybrid/EV Battery Voltage Sense N Circuit Intermittent/Erratic
- P0B85Hybrid/EV Battery Voltage Sense O Circuit Intermittent/Erratic
- P0B8AHybrid/EV Battery Voltage Sense P Circuit Intermittent/Erratic
- P0B8FHybrid/EV Battery Voltage Sense Q Circuit Intermittent/Erratic
- P0B94Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic
- P0B99Hybrid/EV Battery Voltage Sense S Circuit Intermittent/Erratic
- P0B78Hybrid/EV Battery Voltage Sense M Circuit Range/Performance
- P0B79Hybrid/EV Battery Voltage Sense M Circuit Low
- P0B7AHybrid/EV Battery Voltage Sense M Circuit High
- P0B7CHybrid/EV Battery Voltage Sense N Circuit
- P0B7DHybrid/EV Battery Voltage Sense N Circuit Range/Performance
- P0B7EHybrid/EV Battery Voltage Sense N Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.