P0A31: Drive Motor B Temperature Sensor Circuit Range/Performance
What to do
Have it seen without urgency — the motor's overheat protection is what this sensor provides, so a wrong-but-plausible reading is quietly worth fixing.
What this code means
Motor B's temperature reading is electrically alive but implausible — stuck, drifting or disagreeing with the rest of the vehicle's thermal picture.
The reasoning is P0A2B's, applied to the second motor: a frozen mid-range value passes electrical checks and fails plausibility. Wiring and connector first, with the underfloor run in mind if this motor drives the rear axle.
Likely causes
Start here
- Faulty motor temperature sensor · specialist
- Corroded or loose connector · easy
Less common
- Sensor drifted out of calibration · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0A31.