Powertrain, generic · Hybrid propulsion

P0BEC Drive Motor A Phase V Current Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BEC is set when the phase V current sensor of the motor A inverter reports a value above its valid range. In GM's tables the limit is above 700 A for 0.05 of 0.1 s (2016) or 0.1 of 0.15 s (2019), Type A; above 800 A, Type A, on the 2011 Volt with PWM output disabled; and above 700 A, Type B, two trips, on the 2012 two-mode trucks. Because the check runs while the power stage is not switching or the value is far beyond any real current, it isolates a sensor or supply fault rather than an actual overcurrent. It pairs with P0BEB for the low side and P0BEA for offset. Expect reduced drive from motor A and further inverter codes in the memory.

Likely causes

Failed phase V 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

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.