Powertrain, generic · Hybrid propulsion

P0BE9 Drive Motor A Phase V Current Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BE9 covers a general circuit fault of the phase V current sensor in the motor A inverter, meaning an electrical problem the controller does not narrow down to an offset, low or high condition. No manufacturer documents this exact code publicly. GM's hybrid tables for the 2011 Volt, the 2012 two-mode trucks and the 2016 to 2019 models list only the specific siblings P0BEA, P0BEB and P0BEC; GM's BAS Plus (eAssist) table lists phase current codes only for U and W. CARB requires hybrid sensor circuits to be monitored. Because the three phase currents are used together for torque control and their sum is cross-checked (P0BFD), a lost V signal normally forces reduced motor A operation.

Likely causes

Failed phase V 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 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 v current sensorwiring harnesshybrid control module

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