What it means
The drive motor B temperature sensor circuit signal is intermittent. The specific cause depends on the vehicle.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The temperature sensor on drive motor B provides a signal that lets the hybrid control system track motor heat. P0A34 sets when that signal becomes intermittent, so the reported temperature may jump or disappear as a loose connection, noisy ground, or vibration-sensitive contact breaks and reconnects.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Review freeze-frame data and live drive motor B temperature for sudden jumps, dropouts, or changes that coincide with the warning.
- With the vehicle safely powered down under the manufacturer's procedure, check that the drive motor B sensor connector is fully seated and its lock is intact.
- Inspect the sensor wiring, ground reference, and connector pins for corrosion, looseness, chafing, or damage that could change with vibration.
- Use the manufacturer's circuit test procedure to monitor continuity and signal stability while gently moving the accessible harness and connector.
- Repair the unstable connection, clear the code, and confirm the temperature reading stays steady during a controlled road or workshop check.
Common fixes
- Seat and secure the drive motor B temperature sensor connector.
- Repair chafed or loose sensor wiring and restore a sound ground reference.
- Clean or replace damaged or corroded connector terminals.
- Replace the sensor if its signal drops out despite stable wiring and connections.
Can I keep driving?
Use caution and keep trips short because an intermittent reading can cause the hybrid system to limit torque or enter limp mode without much notice. Avoid heavy loads and stop safely if power cuts out or a shutdown warning appears.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.