The P0404 trouble code is associated with Exhaust Gas Recirculation (EGR) Circuit Range or Performance, indicating that the electrical signal from the EGR system is outside the expected range.
Exhaust Gas Recirculation Circuit Range/Performance
Code symptoms P0404.
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 P0404.
1. Wiring or connection issues in the EGR circuit.
2. Faulty EGR solenoid or EGR valve position sensor.
3. Carbon buildup in the EGR system.
4. Problems with the Engine Control Module (ECM).
Code Solutions P0404.
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. Clean or replace components affected by carbon buildup in the EGR system.
4. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.