Powertrain, generic · Hybrid propulsion

P0BE2 Drive Motor Inverter Temperature Sensor F Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0BE2 is set when the voltage from inverter temperature sensor F, the phase W thermistor in GM's motor B inverter, drops below the valid window. Because GM pairs an NTC element with a pull-up resistor, a short to ground is converted into a temperature far above anything the inverter can survive. Limits found in GM's tables: more than 170 °C for 2.5 of 3.5 s, Type B, two trips (2016 and 2018); more than 159 °C for 6.25 of 8.75 s, Type A (2019); more than 130 °C, Type A (2011 Volt); more than 125 °C, Type B (2012 and 2013 two-mode trucks). Genuine overheating of this phase has its own code, P0C16. The thermistor is part of the inverter, so it is rarely replaced on its own.

Likely causes

Shorted thermistor or signal line inside the power inverter module

Signal shorted to ground in external wiring, where the design has any

Moisture or coolant inside the inverter housing

Symptoms

Malfunction indicator lamp and hybrid warning
Power of drive motor B strongly limited
Engine runs more often in hybrid operation

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.