OBD-II code · Powertrain (generic)
P0A31 Drive Motor B Temperature Sensor Circuit Range/Performance
The ECM detects a circuit range/performance fault on the drive motor b temperature sensor. Reading cannot be used reliably for control.
Is it safe to drive with P0A31?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor characteristic drifted
- PossibleSensor mounting displaced
- Less likelySensor element aged beyond calibration window
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Drive Motor B Temp Sensor, Wiring Harness, Hybrid Control Module
Related codes
- P0EF3Drive Motor C Temperature Sensor Circuit Range/Performance
- P0A2EDrive Motor A Temperature Sensor A Circuit Intermittent
- P0A2FDrive Motor A Over Temperature
- P0A30Drive Motor B Temperature Sensor Circuit
- P0A32Drive Motor B Temperature Sensor Circuit Low
- P0A33Drive Motor B Temperature Sensor Circuit High
- P0A34Drive Motor B Temperature Sensor Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.