What it means
The control circuit for the DC/AC converter (used in plug-in hybrid and EV traction systems to convert DC battery voltage to 3-phase AC for the motor) reports a performance issue. This is part of the high-voltage drivetrain.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The DC/AC converter control module manages an inverter that converts high-voltage DC power into AC for the electric traction motor. The vehicle controller monitors the converter's control response and sets this code when that response falls outside the expected range or performance window.
Common causes
Most likely first.
- Inverter internal fault
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
How to diagnose it
- Record freeze-frame data and check hybrid or EV live data for converter faults, warnings, or reduced-power status.
- Inspect only accessible low-voltage connectors and wiring for the converter control module for looseness, corrosion, or visible damage.
- Check related low-voltage power and ground circuits against the manufacturer's specification and review any companion codes.
- Use the manufacturer's diagnostic procedure to compare commanded and reported converter operation and sensor data.
- If external circuits and data checks pass, have the inverter or converter module evaluated using the manufacturer's high-voltage service procedure.
Common fixes
- Secure or repair an accessible low-voltage connector or wire fault at the converter control circuit.
- Repair a confirmed low-voltage power or ground problem to the control module.
- Replace a sensor only if its readings fail the manufacturer's test and its mounting is secure.
- Repair or replace the inverter or converter module only after the prescribed checks confirm an internal fault.
Can I keep driving?
Because this code concerns the high-voltage traction system and may trigger reduced power, stop safely if the vehicle displays a drivetrain warning, loses propulsion, or behaves abnormally. Do not touch orange high-voltage cables; arrange qualified hybrid or EV 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.