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DTC codes / P0Axx · Hybrid propulsion / P0A32

P0A32Drive Motor B Temperature Sensor Circuit Low

P0A32 indicates that the powertrain control module has detected a low voltage signal from the temperature sensor circuit for drive motor B, which is the second electric motor in a hybrid or electric vehicle's propulsion system. The sensor's signal is lower than the expected range, meaning the circuit is likely shorted to ground or the sensor itself has failed.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message
  • Often no symptoms besides the warning light
  • Reduced power or limp mode in some vehicles
  • Inaccurate or erratic temperature readings on the dashboard gauge
  • Possible overheating warnings if the motor temperature is misreported

Common causes, most likely first

  1. Faulty drive motor B temperature sensor
  2. Short to ground in the sensor wiring harness
  3. Corroded or damaged sensor connector
  4. Damaged or pinched wiring between the sensor and the control module
  5. Internal short in the control module affecting the sensor circuit

How to diagnose and fix it

  1. Scan all modules for related codes and freeze frame data to confirm the fault
  2. Visually inspect the sensor wiring and connector for damage or corrosion
  3. Disconnect the sensor and measure its resistance to compare with specifications
  4. Check for continuity between the sensor signal wire and ground to detect a short
  5. Repair or replace damaged wiring or connectors as needed
  6. Replace the drive motor B temperature sensor if it fails testing
  7. Clear codes and verify the repair with a test drive

Don't overlook the wiring harness

  • A short to ground in the wiring harness is a common cause that is often missed when technicians focus solely on the sensor.
  • The code can be set by a faulty connection at the control module, not just at the sensor end.
  • In some hybrid systems, a failing motor temperature sensor can cause the vehicle to enter a reduced power mode to protect the motor.
  • Always check for technical service bulletins specific to the vehicle model, as some harness routing issues are known problems.

Can I keep driving with P0A32?

It is generally safe to drive with this code if the vehicle is not in limp mode, but avoid heavy loads or sustained high speeds until repaired to prevent potential overheating. If the vehicle enters reduced power mode, seek service immediately.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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