Powertrain, generic · Hybrid propulsion

P0A32 Drive Motor B Temperature Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A32 means the motor B temperature signal sits below its valid voltage range. GM uses an NTC thermistor, so a voltage near 0 V reads as an impossibly hot winding: the 2011 hybrid tables set it above 184 °C (Type A, one trip), the 2013 two-mode trucks above 230 °C (Type B, two trips). Mitsubishi sets it on the rear motor of the 2023 Outlander PHEV when the sensor voltage is 0.065 V or less for 0.5 s. A signal wire shorted to ground or a shorted thermistor is the typical cause. P0A33 is the opposite fault, P0A31 the plausibility check, and P0A35 a real over-temperature that GM only evaluates while no out-of-range fault is active. The system derates electric drive and warns the driver.

Likely causes

Sensor signal wire shorted to ground
Thermistor shorted inside the motor
Chafed harness between drive unit and motor control module
Faulty sensor input in the motor control module

Symptoms

  • Hybrid warning or check engine light
  • Motor B temperature shows an extremely high fixed value
  • Electric drive reduced or switched off

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor b temp sensorwiring harnesshybrid control module

Related codes

P0A30P0A31P0A33P0A35P0A2C

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