Powertrain, generic · Hybrid propulsion

P0BFA Drive Motor B Phase W Current Sensor Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BFA checks the phase W current sensor of the motor B inverter for a plausible zero point. GM learns the offset at each start while no current flows and sets the code above 30 A on the 2011 Volt (Type A, power stage open), above 30 A on the 2012 and 2013 two-mode trucks (Type B, two trips, only with P0BFB/P0BFC inactive), above 30 A after 0.1 s in the 2016 tables and above 35 A after 0.4 s in a 2019 table (both Type A). Jeep's EMEA bulletins for the 2020 Renegade and Compass 1.3 PHEV put P0BFA first among the motor B codes, with MIL, turtle and Service 4WD lights, and cure it with new software for the hybrid control processor and auxiliary processor (power inverter module).

Likely causes

Hybrid control processor software (Jeep bulletin 08-056-21/08-057-21)

Zero point of the motor B phase W current sensor drifted past the limit

Faulty current sensing electronics in the power inverter module

Symptoms

Malfunction indicator lamp
Turtle (limp home) light and Service 4WD light (Jeep)
Reduced electric drive power

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–4,000

Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor b phase w current sensorwiring harnesshybrid control module

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.