What it means
Phase X current of drive motor A exceeds the expected window. Indicates phase short, stalled rotor, or sensor offset.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive Motor A uses several electrical phases to produce torque, and the hybrid controller monitors Phase X current to protect the motor and inverter. This code sets when measured Phase X current exceeds its expected window, which may point to a short between motor phases, a stalled rotor, or a biased current sensor.
Common causes
Most likely first.
- Short between motor phases
- Rotor stalled - high stall current
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Read freeze-frame data and compare Drive Motor A Phase X current with the other phases and motor-speed data at the time of the fault.
- Check related hybrid-system codes for evidence of a motor, inverter, or rotor-speed problem occurring at the same time.
- Inspect accessible Phase X sensor wiring and connectors for damaged insulation, shorts, or poor terminal contact.
- Use the manufacturer's procedure to check the Phase X current-sensor output and compare it with the other phase measurements.
- If the sensor circuit passes, have the motor and inverter checked for phase-to-phase faults or rotor stall using the manufacturer's high-voltage procedure.
Common fixes
- Repair damaged insulation, shorted wiring, or poor connections in the Phase X current-sensor circuit.
- Replace the Phase X current sensor if testing confirms a high-reading offset.
- Repair the motor or inverter phase fault if manufacturer-guided testing confirms a short.
- Correct a confirmed mechanical cause of rotor stall before returning the vehicle to service.
Can I keep driving?
Avoid driving under load because excessive Phase X current can cause torque reduction, limp mode, or shutdown and may damage the motor or inverter. Stop if the vehicle loses power or displays a stop-driving warning; high-voltage diagnosis requires qualified handling.
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.