The P0403 trouble code is associated with Exhaust Gas Recirculation (EGR) Circuit Malfunction, indicating an issue with the electrical circuit of the EGR system.
Exhaust Gas Recirculation Circuit Malfunction
Code symptoms P0403.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Poor engine performance.
3. Increased emissions.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0403.
1. Wiring or connection issues in the EGR circuit.
2. Faulty EGR solenoid or EGR valve position sensor.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0403.
1. Inspect and, if necessary, repair any faults in the wiring or connections of the EGR circuit.
2. Check and, if needed, replace the malfunctioning EGR solenoid or EGR valve position sensor.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.