P0BF5Drive Motor B Phase V Current Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BF5 stands for a general circuit fault of the phase V current sensor in the motor B inverter, an electrical problem the controller does not narrow down to offset, low or high. No manufacturer documents this exact code publicly. GM's hybrid tables for the 2011 Volt, the 2012 and 2013 two-mode trucks and the 2016 to 2019 models use only the specific siblings P0BF6, P0BF7 and P0BF8; GM's single-motor BAS Plus (eAssist) system has no motor B codes at all. CARB requires circuit monitoring of hybrid sensors. Since the three phase currents of motor B are used together and their sum is cross-checked (P0BFE), losing the V signal normally forces motor B into restricted operation.
- What you may notice
- Hybrid system warning and malfunction indicator lamp
- Reduced power from drive motor B
- Likely causes
- LikelyFailed phase V current sensor in the motor B inverter
- PossibleSupply or signal fault on the inverter's sensor board
- RareSoftware fault in the motor B control processor
- 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.