P0B8C
Hybrid/EV Battery Voltage Sense Q Circuit Range/Performance
The BMS detects a circuit range/performance fault on voltage sense channel Q of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
Ordered by how often each turns out to be the cause.
- Sense voltage driftedCommon
- High-resistance contactPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Hv Battery Voltage Sense Q
- Wiring Harness
- Bms
P0B8C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.