Powertrain, generic · Hybrid propulsion

P0BED Drive Motor A Phase W Current Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BED is the general circuit code of the phase W current sensor in the drive motor A inverter, for an electrical fault outside the offset, low and high categories. No manufacturer documents this exact code publicly; GM's hybrid tables from the 2011 Volt to 2019, including the BAS Plus (eAssist) system, use P0BEE, P0BEF and P0BF0 instead. CARB requires hybrid sensor circuits to be monitored. Phase W matters even on systems with only two sensors: GM's eAssist table measures U and W and, if either sensor fails, runs current control in an alternate mode without the sensors. Expect reduced motor A torque, and check for related inverter codes before replacing parts.

Likely causes

Failed phase W current sensor inside the inverter

Supply or signal fault on the inverter's sensor board

Software fault in the motor control processor

Symptoms

Hybrid system warning and malfunction indicator lamp
Reduced power or assist from drive motor A

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€150–4,000

Time1–6 h

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

Parts involved

drive motor a phase w current sensorwiring harnesshybrid control module

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.