What it means
The control module detected a fault associated with generator phase W current. The code alone does not identify whether the cause is in the current measurement circuit, inverter, or generator.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The inverter controls generator output, while the hybrid control module monitors current in generator phase W. This code flags a fault associated with the phase W current reading; the code alone cannot distinguish a failed sensor from a wiring, inverter, or generator problem.
Common causes
Most likely first.
- Phase current sensor failed
- Wiring fault
Symptoms
- Check-engine or hybrid-system warning light
- Reduced hybrid performance
- Possible reduced-power mode
How to diagnose it
- Save freeze-frame data and compare live generator phase W current with phases U and V for missing, erratic, or inconsistent readings.
- Check for related generator, inverter, or current-sensor codes and note when any reduced hybrid performance occurs.
- With high-voltage safety procedures followed, inspect the phase W harness and generator and inverter connectors for loose terminals, corrosion, chafing, and overheating.
- Test the phase W current-sensor circuit and wiring for opens, shorts, and poor connections using the manufacturer's diagnostic information.
- If the sensor circuit passes, have the inverter phase W output and generator phase W winding tested against the manufacturer's specification.
Common fixes
- Secure or repair a damaged or loose phase W connector.
- Repair an open or short in the phase W current-sensor wiring.
- Replace the phase W current sensor if its output is confirmed faulty.
- Repair or replace the inverter or generator if testing isolates an internal fault.
Can I keep driving?
Limit driving and arrange prompt diagnosis because reduced hybrid performance or reduced-power mode may occur. Stop if propulsion becomes unreliable or a warning directs you to stop, and keep clear of high-voltage components.
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.