Powertrain, generic · Hybrid propulsion

P0BE1 Drive Motor Inverter Temperature Sensor F Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P0BE1 is the plausibility check of inverter temperature sensor F, GM's phase W thermistor in the motor B inverter. After the car has stood long enough, its reading must match a reference: in the 2016 and 2018 tables a calculated average after cold soak, with more than 20 °C difference for 0.525 of 0.625 s setting Type B over two trips, Type A in a 2019 table. The 2011 Volt compares against power electronics coolant temperature (20 °C, Type A), the 2012 and 2013 two-mode trucks after 360 minutes off with a 15 °C limit (Type B). GM bulletin PIC6303A lists P0BE1 for 2016-18 Volt, Malibu, LaCrosse, Velite and Regal: no customer-noticeable reaction, inverter replacement only with P0AC4.

Likely causes

Phase W thermistor of inverter B drifting out of tolerance

Uneven inverter cooling or residual heat after the soak period

Failing power inverter module (replace only with P0AC4 per GM PIC6303A)

Symptoms

Malfunction indicator lamp after two drives, usually without drivability change
Code found during inspection without customer complaint

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–4,000

Time0.5–6 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.