What it means
The hybrid control module detects a generic fault on phase X current measurement of drive motor A. The drive motor's position, current and temperature are watched continuously; a fault here downgrades the inverter to a safe operating point or triggers torque reduction.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive Motor A is an electric traction motor, and the hybrid control module monitors its phase currents to control torque and protect the inverter. This code identifies a fault in the Phase X current measurement, so the module may limit torque or place the inverter in a safe operating state.
Common causes
Most likely first.
- Phase current sensor failed
- Wiring or connector fault
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 all hybrid-system codes, then review Drive Motor A Phase X current data alongside the other phases.
- Inspect the accessible Drive Motor A and inverter connectors and harness for damage, corrosion, or loose connections without disturbing high-voltage components.
- Check the low-voltage wiring and connector terminals for the Phase X current sensor using the manufacturer's wiring information.
- Have the Phase X current-sensor signal and supply checked using the manufacturer's diagnostic procedure.
- If wiring and sensor checks pass, follow the manufacturer's procedure to assess the inverter and Drive Motor A current measurement.
Common fixes
- Repair a loose or damaged low-voltage connector or harness serving the Phase X current measurement.
- Repair an identified wiring fault in the current-sensor circuit.
- Replace the Phase X current sensor if testing confirms it has failed.
- Repair or replace the inverter only if manufacturer-guided testing identifies it as the source.
Can I keep driving?
Reduced torque, limp mode, or shutdown can occur, so avoid high-speed or high-load driving and stop if the vehicle warns of a hybrid fault or loses power. High-voltage diagnosis should be handled by someone qualified to work on the vehicle's system.
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.