What it means
Phase X current of drive motor A is below the expected window. Indicates open winding, short, 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 produces torque through multiple electrical phases, and Phase X current is measured so the hybrid controller can regulate motor output. This code sets when measured Phase X current is below its expected window, which can indicate a partially open phase winding or a current-sensor offset.
Common causes
Most likely first.
- Phase winding partially open
- Current sensor offset drifted
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 phase readings during the recorded operating condition.
- Check for related hybrid-system codes that may point to a shared inverter, motor, or current-sensor issue.
- Inspect accessible low-voltage Phase X sensor wiring and connectors for damage, corrosion, or loose terminals.
- Use the manufacturer's procedure to check Phase X current-sensor output and offset against the other phase measurements.
- If sensor wiring and readings are sound, have the motor and inverter phase circuit assessed according to the manufacturer's high-voltage procedure.
Common fixes
- Repair a loose, corroded, or damaged Phase X sensor connector or low-voltage wire.
- Repair a confirmed fault in the Phase X current-sensor circuit.
- Replace the current sensor if its offset is outside the manufacturer's specification.
- Repair the Drive Motor A winding or inverter only if testing confirms an electrical fault there.
Can I keep driving?
The vehicle may limit motor torque or enter limp mode, so avoid hard acceleration and busy high-speed routes. Stop if power drops sharply or a hybrid-system warning instructs you to stop; high-voltage testing 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.