P0A34
Drive Motor B Temperature Sensor Circuit Intermittent.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- A
- AreaHybrid propulsion
- 34
- FaultThe specific fault in that area
What it means
P0A34 is a generic powertrain code for the Drive Motor 'B' temperature sensor circuit. The hybrid or electric vehicle control unit has seen the sensor signal drop out, jump or go implausible from time to time, rather than fail permanently. The motor itself may be perfectly healthy, but the control unit cannot fully trust the temperature reading.
Symptoms
- Hybrid or electric system warning light on the dashboard
- Reduced power or limp-home mode, especially under load or when hot
- Intermittent loss of drive assistance or reduced regeneration
- Cooling fan or pump running harder than expected
- Fault appearing and clearing on its own, often over bumps or when the car is warm
Possible causes
- Damaged, chafed or corroded wiring in the motor temperature sensor circuitlikely
- Poor connection at the motor connector or control unit connector (loose pin, moisture, corrosion)likely
- Failing drive motor temperature sensor with an intermittent internal faultpossible
- Wiring harness movement or vibration causing a break that opens and closespossible
- Coolant or fluid leak contaminating the connector or sensorpossible
- Fault within the motor control or inverter unit, or an outdated calibration where the manufacturer has issued a known fixrare
How to diagnose
- Read all stored and pending codes and note any other motor temperature, inverter or cooling system codes
- Review freeze frame data for motor temperature, vehicle speed and load when the fault set
- Inspect the motor temperature sensor wiring and connectors for chafing, corrosion, moisture and bent or pushed-back pins
- Watch live motor temperature data while gently wiggling the harness and connector, looking for spikes or dropouts
- Compare the reading with other motor temperature sensors and with coolant temperature on a cold car
- Check the sensor circuit for resistance, continuity, short to ground and short to voltage using the manufacturer's wiring diagram and specifications
- Check the cooling system level and for leaks near the motor, as procedures vary by model
- Check for manufacturer service bulletins or software updates for your model before replacing major parts
How to fix
- Repair or replace damaged wiring in the sensor circuit
- Clean, repair or replace the affected connector and terminals, and seal against moisture
- Replace the drive motor temperature sensor if testing shows it is faulty, following the model-specific procedure
- Fix any coolant or fluid leak and replace contaminated connectors
- Apply a manufacturer-approved software update if an outdated calibration is a known cause
- Clear the code after repair and road test to confirm it does not return
Can I keep driving?
Medium severity
Short, gentle journeys are usually possible, but the car may drop into reduced power and the motor is not being monitored reliably. Book it in soon, and stop driving if a red warning appears or power is lost.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.