What it means
Generator phase W current is above the expected range. The code identifies a high-current condition but does not establish its cause.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The inverter and hybrid control module monitor current in generator phase W while the generator is operating. This code sets when phase W current is higher than expected, which may result from a short between phases or a stalled generator rotor drawing excessive current.
Common causes
Most likely first.
- Short between motor phases
- Rotor stalled - high stall current
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 to identify when the excessive reading occurs.
- Check related generator, inverter, and stall codes and note whether the fault coincides with reduced power or a hybrid warning.
- With high-voltage safety procedures followed, inspect phase W wiring and generator and inverter connectors for insulation damage, cross-phase shorts, or overheating.
- Have a qualified technician test phase-to-phase and phase-to-ground insulation and generator winding condition against the manufacturer's specification.
- If wiring and winding tests pass, check for generator rotor binding and compare the inverter's phase current measurements.
Common fixes
- Repair damaged or shorted phase W wiring and connector terminals.
- Repair or replace a generator winding confirmed shorted to another phase or ground.
- Correct a confirmed mechanical cause of generator rotor stall.
- Repair the inverter current-sensing or switching circuitry if testing isolates the fault there.
Can I keep driving?
Avoid driving if the vehicle loses power, stalls, or displays a stop warning; high phase current can lead to reduced-power mode or shutdown. Keep clear of high-voltage parts and arrange prompt diagnosis.
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.