Powertrain, generic · Hybrid propulsion

P0BD1 Drive Motor Inverter Temperature Sensor C Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

Which thermistor is called sensor C depends on the maker. In GM's hybrid tables it is the second sensor of the motor A inverter: the phase V sensor in the 2016 to 2019 tables, labelled temperature sensor 2 in the Volt and ELR. P0BD1 is its general circuit code for an electrical fault that is not classified as low, high or erratic. No manufacturer documents this exact code publicly; GM reports only the specific siblings P0BD2, P0BD3 and P0BD4. CARB requires hybrid sensor circuits to be monitored. Without a valid value the controller cannot protect that phase and normally limits motor torque. The sensor sits inside the inverter, so repairs often mean replacing the assembly.

Likely causes

Internal fault of the sensor inside the power inverter module

Corroded or loose connector at the inverter module

Software fault in the motor control processor

Symptoms

Hybrid system warning or check engine lamp
Reduced electric drive power
Possible loss 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 inverter temp sensor cwiring harnesshybrid control module

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.