What it means
The current sensor for drive motor A phase X reports a circuit fault. Phase current measurement is unreliable.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The phase X current sensor measures current in drive motor A so the inverter control system can regulate motor output. This code sets when the phase X sensor circuit has a fault and its current measurement cannot be trusted, potentially reducing torque or triggering a protective shutdown.
Common causes
Most likely first.
- Current sensor failed
- Wiring fault
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Record freeze-frame data and review available live phase X current data for drive motor A, comparing it with other motor data when the system is safely enabled.
- Inspect the phase X current sensor connector and accessible wiring for damage, corrosion, loose pins, or signs of overheating.
- Check the sensor power, ground, and signal circuit against the wiring diagram and manufacturer's specification.
- Test the phase X signal circuit for continuity and shorts using the manufacturer's procedure, observing high-voltage safety precautions.
- If wiring and connections pass, test the current sensor and replace it if its output fails the manufacturer's specification.
Common fixes
- Secure or clean a loose or corroded current sensor connector.
- Repair damaged wiring in the drive motor A phase X sensor circuit.
- Replace the failed phase X current sensor if confirmed by testing.
- Clear the code and verify normal current reporting under the manufacturer's procedure.
Can I keep driving?
Do not continue a journey if motor power is reduced, limp mode is active, or the vehicle may shut down; arrange a safe stop and service. Avoid touching inverter or motor wiring because the drive system can contain hazardous high voltage.
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.