OBD-II code · Powertrain (generic)
P0B79 Hybrid/EV Battery Voltage Sense M Circuit Low
The BMS detects a circuit low 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 P0B79?
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 M, Wiring Harness, Bms
Related codes
- 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
- P0B7EHybrid/EV Battery Voltage Sense N Circuit Low
- P0B83Hybrid/EV Battery Voltage Sense O Circuit Low
- P0B88Hybrid/EV Battery Voltage Sense P Circuit Low
- P0B8DHybrid/EV Battery Voltage Sense Q Circuit Low
- P0B92Hybrid/EV Battery Voltage Sense R Circuit Low
- P0B97Hybrid/EV Battery Voltage Sense S Circuit Low
- P0B76Hybrid/EV Battery Voltage Sense L Circuit Intermittent/Erratic
- P0B77Hybrid/EV Battery Voltage Sense M Circuit
- P0B78Hybrid/EV Battery Voltage Sense M Circuit Range/Performance
- P0B7AHybrid/EV Battery Voltage Sense M Circuit High
- P0B7BHybrid/EV Battery Voltage Sense M Circuit Intermittent/Erratic
- P0B7CHybrid/EV Battery Voltage Sense N Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.