P0BFCDrive Motor B Phase W 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
- P0BFC is the signal-high fault of the phase W current sensor in the motor B inverter. GM sets it above 800 A on the 2011 Volt (Type A, one trip), above 700 A on the 2012 and 2013 two-mode trucks (Type B, two trips, 10 of 15 samples) 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). A reading this high with no matching battery current indicates the sensor, its supply or an open reference instead of actual current; true phase overcurrent of motor B is logged as P0C04, and the plausibility of all three phases together as P0BFE. With P0BFC stored the inverter derates motor B, and the hybrid system leans more on the engine and motor A.
- What you may notice
- Malfunction indicator lamp and hybrid warning
- Reduced power from drive motor B
- Engine runs more often because electric drive is limited
- Likely causes
- LikelyFailed phase W 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.