What it means
The DC/AC converter A has detected an over-temperature condition. The effect on converter operation depends on the vehicle design.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
DC/AC converter A changes direct current into alternating current for vehicle electrical equipment; its exact role varies by design. The control module monitors converter temperature and sets this code when it detects that converter A is too hot, which can limit or disable its functions.
Common causes
Most likely first.
- Ambient temperature too high
- Cooling path blocked
Symptoms
- Check-engine or hybrid-system warning light
- Reduced or disabled converter-related functions
How to diagnose it
- Record freeze-frame data and check hybrid-system and converter live data for the temperature and operating conditions when the fault occurred.
- With the vehicle safely parked, inspect the converter A cooling-air or coolant path for blocked openings, debris, leaks, or other visible restrictions.
- Check whether unusually high ambient heat or sustained heavy electrical demand coincided with the fault.
- If scan data or inspection points to a cooling-system problem, test the relevant fan, pump, ducting, or coolant circuit using the manufacturer's procedures.
- After addressing any restriction, clear the code and confirm converter temperature remains controlled during operation.
Common fixes
- Remove debris or obstructions from the converter A cooling path.
- Restore airflow by repairing damaged or displaced ducts or shrouds.
- Repair a failed cooling fan, pump, or related connection if testing identifies it.
- Replace converter A only if its temperature sensing or internal operation is confirmed faulty.
Can I keep driving?
If the vehicle displays a hybrid-system warning, reduced power, or disables converter-related functions, avoid high loads and long trips; stop safely if the vehicle reports a critical fault. Continued overheating can cause the converter to shut down or sustain damage.
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.