P0BF3Drive Motor B Phase U Current Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BF3 is stored when the phase U current sensor of the motor B inverter reports a value below its valid range. GM converts the sensor voltage into amps and sets the code below -800 A on the 2011 Volt (Type A, 4 of 6 samples), below -700 A on the 2012 and 2013 two-mode trucks (Type B, two trips), and below -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). No real phase current of motor B reaches such values, so the reading reflects an electrical defect, typically a sensor output pulled toward ground or a dead sensor. The offset check P0BF2 covers a shifted zero instead. Motor B is then restricted or shut off.
- What you may notice
- Malfunction indicator lamp and hybrid warning
- Reduced power or no contribution from drive motor B
- Possible shutdown of electric drive
- Likely causes
- LikelyFailed phase U current sensor in the motor B inverter
- PossibleSensor signal or supply pulled to ground on the sensor board
- 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.