Powertrain, generic · Hybrid propulsion

P0BE3 Drive Motor Inverter Temperature Sensor F Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BE3 is the high-signal fault of inverter temperature sensor F, GM's phase W thermistor in the motor B inverter. With an NTC element and pull-up, an open circuit or a sensor that has lost ground drives the voltage up, which the controller reads as an implausibly cold inverter. GM only judges this after the inverter has worked for at least 90 s at 20 Nm or more: below -50 °C for 2.625 of 3.65 s sets Type B, two trips (2016 and 2018 tables), or Type A for 6.25 of 8.75 s (2019). The 2011 Volt uses below -58 °C (Type A), the 2012 and 2013 two-mode trucks below -40 °C (Type B). Expect limited output from motor B until the circuit is repaired.

Likely causes

Open thermistor or broken connection inside the power inverter module

Loose or corroded connector at the inverter

Lost sensor reference ground on the sensing board

Symptoms

Malfunction indicator lamp and hybrid warning
Reduced power from drive motor B once warmed up

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 inverter temp sensor fwiring harnesshybrid control module

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