P0A32
Drive Motor B Temperature Sensor Circuit Low.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- A
- AreaHybrid propulsion
- 32
- FaultThe specific fault in that area
What it means
P0A32 is a generic powertrain code for a hybrid or electric vehicle. It means the control unit has seen a voltage from the Drive Motor 'B' temperature sensor circuit that is lower than the expected range. This usually points to a short to ground in the sensor or its wiring, or a failed sensor. The code and the motor labelled 'B' vary by model, so confirm which motor it refers to.
Symptoms
- Hybrid or EV system warning light on
- Malfunction indicator lamp lit
- Reduced power or limp mode
- Motor output limited, especially under load or when hot
- Cooling fan or pump running more than normal
- Reduced electric assist or vehicle will not enter ready mode
Possible causes
- Drive motor B temperature sensor failed internally (reading as short circuit)likely
- Sensor signal wire chafed or shorted to ground in the harnesslikely
- Water ingress, corrosion or damaged pins in the sensor or motor connectorpossible
- Damaged harness near the motor housing from heat, vibration or previous repair workpossible
- Fault inside the inverter or motor control unit's sensor input circuitrare
- Outdated or faulty control unit software, only where the manufacturer has published a known fix for this modelrare
How to diagnose
- Read all stored and pending codes and note any other motor temperature, inverter or cooling system faults.
- Review freeze frame data to see motor temperature, vehicle speed and load when the code set.
- Check live data for the drive motor B temperature and compare it with the other motor temperature readings and coolant temperature on a cold vehicle. A reading stuck at an extreme low-resistance value suggests a short.
- Only after following the manufacturer's high-voltage safety procedure, inspect the sensor wiring and connectors for chafing, water, corrosion and bent or pushed-back pins.
- Unplug the sensor connector (with the system safely shut down) and see if the reading changes to an open-circuit value. If it does, the fault is the sensor or the wiring on the sensor side.
- Measure the sensor resistance and check the wiring for shorts to ground and to other wires against the manufacturer's specifications.
- Check for software updates or technical bulletins for your model and the specific motor layout.
- Clear the code and road test to check it does not return.
How to fix
- Replace the drive motor B temperature sensor if it is out of specification.
- Repair or replace the damaged section of wiring, and secure it clear of heat and sharp edges.
- Clean, dry and repair or replace corroded or damaged connectors and terminals.
- Repair the water leak or seal that let moisture reach the connector.
- Replace or reprogram the motor or inverter control unit only after the wiring and sensor are proven good, and only where the manufacturer specifies it.
- Apply a manufacturer software update only if one exists for this known issue.
Can I keep driving?
The car may still be driveable, but the system may limit power to protect the motor as it cannot see a true temperature. Have it checked soon, and stop if the warning lights come on with a loss of power, or a high-voltage warning appears.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.