What it means
Phase Y 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
The inverter controls current through drive motor A's phase Y winding, while a sensor lets the hybrid control module monitor it. This code sets when phase Y current is above the expected range, potentially from a phase-to-phase short, a stalled rotor drawing excessive current, or a sensor offset.
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
- Save freeze-frame data and compare phase Y current with phases X and Z to see whether the high reading occurred at a particular speed or load.
- Check for related motor, inverter, or rotor-position codes that could point to a short or a motor that is not turning as commanded.
- Disable the high-voltage system using the manufacturer's safety procedure, then inspect phase Y and adjacent phase wiring and connectors for damage, melted insulation, or signs of arcing.
- Have the motor phase insulation and winding condition checked using the manufacturer's test procedure; do not probe high-voltage circuits without the required equipment and training.
- If the winding checks pass, test the phase Y current sensor and inverter measurement circuit for an offset or internal fault.
Common fixes
- Repair damaged phase wiring or connectors if testing confirms the fault is external.
- Replace a failed phase Y current sensor if separately serviceable.
- Repair or replace drive motor A if a phase-to-phase winding short is confirmed.
- Repair or replace the inverter if its phase Y sensing or switching circuit is faulty.
Can I keep driving?
Do not continue driving if the warning comes with unusual motor noise, a burning smell, strong power loss, or a shutdown; stop safely and arrange recovery. Excess current can overheat or damage the inverter and motor, so avoid acceleration and heavy loads.
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.