P0BF0Drive Motor A 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
- P0BF0 is the high-signal fault of the phase W current sensor in the motor A inverter. GM sets it 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; above 700 A, Type B, two trips, on the 2012 two-mode trucks; above 440 A, Type B, in the BAS Plus (eAssist) table; the 2011 Volt uses 800 A limits for this sensor family. A value this high without matching battery current points to the sensor, its supply or an open reference rather than to real overcurrent, which GM reports separately (P0C01). With P0BF0 active, GM's eAssist logic switches to sensorless current control and suspends P0BFD, so motor A is limited until repair.
- What you may notice
- Malfunction indicator lamp and hybrid warning
- Reduced power from drive motor A
- Likely causes
- LikelyFailed phase W current sensor inside the 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.