Powertrain, generic · Hybrid propulsion

P0BE7 Drive Motor A Phase U Current Sensor Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BE7 means the output of the phase U current sensor in the motor A inverter has fallen below its valid range. GM converts the sensor voltage into amps and compares it with a limit: below -700 A for 0.05 of 0.1 s in the 2016 tables and 0.1 of 0.15 s in a 2019 table, both Type A; below -700 A, Type B, on the 2012 two-mode trucks; below -440 A, Type B, two trips, in the BAS Plus (eAssist) table; the 2011 Volt uses 800 A limits for these sensors. Such values are far beyond real phase currents, so the cause is electrical, typically a sensor signal pulled toward ground. GM's eAssist controller then runs current control without the sensors, which costs motor A performance.

Likely causes

Failed phase U 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 or no assist 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 u current sensorwiring harnesshybrid control module

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