Powertrain, generic · Hybrid propulsion

P0BD2 Drive Motor Inverter Temperature Sensor C Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P0BD2 checks whether inverter temperature sensor C, GM's second sensor in the motor A inverter, agrees with the other temperatures after a cold soak. More than 20 °C apart sets it: Type B, two trips, on the 2016 Volt; Type A in a 2019 table; Type A on the 2011 Volt and 2016 ELR, compared with coolant and transmission temperature after 6 h off. GM's 2012 and 2013 tables use 15 °C after 360 min. GM bulletin PIC6303A says that on 2016-18 Volt, Malibu, LaCrosse and Regal the code alone needs no repair; the inverter is replaced only with P0AC4. GM fixes it by software on the 2017 Bolt EV and Ampera-e. Porsche replaces a coolant hose with a sticking thermostat on the Cayenne S E-Hybrid.

Likely causes

Inverter module software (GM bulletin 18-NA-064, Bolt EV/Ampera-e)

Sticking thermostat in the power electronics coolant hose (Porsche Cayenne S E-Hybrid)

Inverter temperature sensor C drifting out of tolerance

Failing power inverter module

Symptoms

Malfunction indicator lamp, often without drivability change
Propulsion power reduced message (Bolt EV)
Red hybrid warning in the cluster (Porsche)

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 cwiring harnesshybrid control module

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