Powertrain, generic · Hybrid propulsion

P0BEB Drive Motor A Phase V Current Sensor Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BEB reports that the phase V current sensor in the motor A inverter outputs a signal below its valid range. GM compares the converted current with a lower limit: below -700 A for 0.05 of 0.1 s (2016 tables) or 0.1 of 0.15 s (2019 table), Type A, one trip; below -800 A, Type A, on the 2011 Volt; below -700 A, Type B, two trips, on the 2012 two-mode trucks. Real phase currents never reach these values, so the code points to an electrical fault such as a sensor output pulled toward ground or a dead sensor. Unlike P0BEA, the sensor is not just shifted but out of its measuring range. Motor A is then run in a restricted mode.

Likely causes

Failed phase V current sensor inside the inverter

Sensor signal or supply pulled to ground on the sensor board

Poor contact at an internal or external inverter connector

Symptoms

Malfunction indicator lamp and hybrid warning
Reduced power from drive motor A
Possible shutdown of electric drive

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