P0BF7 code meaning
Drive Motor B Phase V Current Sensor Circuit Low
Powertrain system Generic code P0Bxx codes Check engine light
What P0BF7 means
P0BF7 reports that the phase V current sensor of the motor B inverter outputs a signal below its valid range. In GM's hybrid tables the converted current must fall below -800 A on the 2011 Volt (Type A, one trip), below -700 A on the 2012 and 2013 two-mode trucks (Type B, two trips, 10 of 15 samples) or below -700 A for 0.05 of 0.1 s (2016) and 0.1 of 0.15 s (2019), both Type A. Values like these are physically impossible for the motor phase, so the controller treats them as a sensor or circuit failure, for example a shorted output or a lost sensor supply. Unlike P0BF6 the sensor is not merely offset but outside its measuring range. Drive motor B then runs restricted.
P0BF7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0BF7
- Malfunction indicator lamp and hybrid warning
- Reduced power or no contribution from drive motor B
- Possible shutdown of electric drive
Common causes of P0BF7
- Most likelyFailed phase V current sensor in the motor B inverter
- PossibleSensor signal or supply pulled to ground on the sensor board
- Less likelyPoor contact at an internal or external inverter connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b phase v current sensorWiring harnessHybrid control module
What each part of P0BF7 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| F7 | The exact fault in that area. |
What to do next
- Note P0BF7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0BF7
What does P0BF7 mean?
P0BF7 means "Drive Motor B Phase V Current Sensor Circuit Low". P0BF7 reports that the phase V current sensor of the motor B inverter outputs a signal below its valid range. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BF7?
Drive gently and only to a workshop. With P0BF7 the car can go into limp mode (reduced power) to protect itself.
Will P0BF7 fail an emissions test?
Yes, it can. P0BF7 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0BF7 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0BF7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.