What it means
The drive motor A rotor position signal is implausible relative to motor speed and torque commands, indicating drift or alignment fault.
At a glance
- Usually lights the check-engine light
How it works
Drive Motor A's position sensor supplies rotor-position feedback for inverter commutation. This low-circuit code indicates that the monitored signal is below its expected electrical range; it does not by itself establish that the sensor is misaligned or worn. A low signal can also result from a short, poor connection, or fault in the sensor supply or return circuit.
Common causes
Most likely first.
- Resolver alignment off
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Check freeze-frame data and live readings for Drive Motor A position signal and related sensor-circuit codes to confirm when the low reading occurs.
- Following the manufacturer's high-voltage safety procedure, inspect the Drive Motor A sensor connector and harness for a loose fit, corrosion, pin damage, or chafing.
- Use the wiring diagram to check the sensor supply, signal, and return circuits for shorts or poor connections, comparing results with the manufacturer's specifications.
- Monitor the position signal during the manufacturer's approved test to see whether it remains low or changes with motor rotation.
- If the wiring and connections pass, test sensor mounting and alignment, then test the position sensor itself according to the manufacturer's procedure.
Common fixes
- Clean and secure a loose or corroded Drive Motor A position-sensor connection.
- Repair a shorted or damaged sensor wire or poor return connection.
- Correct sensor mounting or alignment if testing confirms it is incorrect.
- Replace the Drive Motor A position sensor only if it fails the manufacturer's tests.
Can I keep driving?
Have the fault diagnosed promptly and avoid hard acceleration or high-speed trips, since low position feedback can reduce motor power or lead to limp mode. Stop safely if torque becomes unpredictable or a stop 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.