Powertrain, generic · Hybrid propulsion

P0BCE Generator Inverter Temperature Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0BCE means the signal of generator inverter temperature sensor A is below its valid range. Inverter thermistors are usually NTC types with a pull-up resistor, as GM's tables describe for the drive motor inverter sensors: a short to ground or a shorted element pulls the voltage down, which the controller reads as an impossibly hot inverter. GM sets the comparable drive motor codes at roughly 125 to 170 °C, depending on generation. No manufacturer documents P0BCE itself publicly; CARB requires this circuit monitoring for hybrid sensor inputs. The controller then protects the generator inverter with a substitute value and limits generator power. A real overheat is reported separately as P0A3E.

Likely causes

Shorted sensor or circuit inside the inverter assembly
Signal shorted to ground in external wiring, where present
Moisture or coolant inside the inverter housing

Symptoms

  • Malfunction indicator lamp and hybrid warning
  • Generator power strongly limited
  • Battery charge drops, engine runs more

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

generator inverter temp sensor awiring harnesshybrid control module

Related codes

P0BCFP0BCCP0BCDP0BD0P0DF5P0A3E

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