Powertrain, generic · Hybrid propulsion

P0BE8 Drive Motor A Phase U Current Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BE8 is the high-side counterpart of P0BE7: the phase U current sensor of the motor A inverter reports a value above its valid range. GM's tables set it above 700 A for 0.05 of 0.1 s (2016) or 0.1 of 0.15 s (2019), Type A, one trip; above 800 A, Type A, on the 2011 Volt; above 700 A, Type B, on the 2012 two-mode trucks; and above 440 A, Type B, two trips, in the BAS Plus (eAssist) table. A reading this high without matching battery current points to the sensor or its supply rather than real current; genuine excess current is covered by separate overcurrent codes such as P0C01. The inverter then uses a fallback control strategy and motor A delivers less torque.

Likely causes

Failed phase U current sensor inside the inverter

Sensor signal shorted to the sensor supply voltage or open reference ground

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 u current sensorwiring harnesshybrid control module

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