OBD-II code · Powertrain (generic)
P0B91 Hybrid/EV Battery Voltage Sense R Circuit Range/Performance
The BMS detects a circuit range/performance fault on voltage sense channel R of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
Is it safe to drive with P0B91?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySense voltage drifted
- PossibleHigh-resistance contact
- Less likelySensor element aged beyond calibration window
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 R, Wiring Harness, Bms
Related codes
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- P0B78Hybrid/EV Battery Voltage Sense M Circuit Range/Performance
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- P0B82Hybrid/EV Battery Voltage Sense O Circuit Range/Performance
- P0B87Hybrid/EV Battery Voltage Sense P Circuit Range/Performance
- P0B8CHybrid/EV Battery Voltage Sense Q Circuit Range/Performance
- P0B96Hybrid/EV Battery Voltage Sense S Circuit Range/Performance
- P0B9BHybrid/EV Battery Voltage Sense T Circuit Range/Performance
- P0BA0Hybrid/EV Battery Voltage Sense U Circuit Range/Performance
- P0BA5Hybrid/EV Battery Voltage Sense V Circuit Range/Performance
- P0BAAHybrid/EV Battery Voltage Sense W Circuit Range/Performance
- P0BAFHybrid/EV Battery Voltage Sense X Circuit Range/Performance
- P0B8EHybrid/EV Battery Voltage Sense Q Circuit High
- P0B8FHybrid/EV Battery Voltage Sense Q Circuit Intermittent/Erratic
- P0B90Hybrid/EV Battery Voltage Sense R Circuit
- P0B92Hybrid/EV Battery Voltage Sense R Circuit Low
- P0B93Hybrid/EV Battery Voltage Sense R Circuit High
- P0B94Hybrid/EV Battery Voltage Sense R Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.