P0403 Exhaust Gas Recirculation Circuit
Electrical fault in the EGR control circuit.
Common causes
- Faulty EGR solenoid or motor
- Wiring damage
Symptoms
- Check engine light
- Possible rough idle
What to check
- Inspect connector
- Measure solenoid resistance
- Check control signal
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0403, follow the service information for that make and model.