P0BF8Drive Motor B Phase V Current Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BF8 sets when the phase V current sensor of drive motor B reports more current than its valid range allows. GM uses above 800 A on the 2011 Volt with the PWM output disabled (Type A), above 700 A on the 2012 and 2013 two-mode trucks (Type B, two trips) and above 700 A for 0.05 of 0.1 s in the 2016 tables or 0.1 of 0.15 s in a 2019 table (Type A, one trip). Such a reading while the inverter is not switching, or far above the overcurrent limit, isolates a sensor-side fault such as a signal shorted to the supply or a broken reference ground. It pairs with P0BF7 for the low side and P0BF6 for offset; real overcurrent appears as P0C04. Expect motor B to be derated and further inverter codes in memory.
- What you may notice
- Malfunction indicator lamp and hybrid warning
- Reduced power from drive motor B
- Likely causes
- LikelyFailed phase V current sensor in the motor B inverter
- PossibleSensor signal shorted to the sensor supply voltage or open reference ground
- RarePoor contact at an internal or external inverter connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.