Check Engine Code
P0404
Exhaust Gas Recirculation (EGR) Control Circuit — Range/Performance
What P0404 means
P0404 means the ECM commanded the EGR valve to a position but the feedback signal doesn't match — the valve isn't opening/closing the way it should. It is usually a sticking, carbon-fouled valve or a bad position sensor rather than a full failure.
Symptoms
- Check engine light on
- Rough idle or hesitation (sometimes no noticeable symptoms)
- Light pinging or surging under load
- Occasional stalling
Likely causes (most common first)
- Carbon buildup binding the EGR valve
- Faulty EGR valve position sensor
- Sticking or failed electronic EGR valve motor
- Wiring or connector fault at the EGR valve
Can I keep driving?
Yes, short-term. Clean or replace the EGR valve when convenient — a stuck valve can eventually cause stalling or failed emissions.
Typical repair cost
DIY fixes can start near $60 (parts only). Shop repairs for P0404 typically run up to $500 depending on the underlying cause and vehicle. Start with the most common cause — Carbon buildup binding the EGR valve — before throwing parts at it.
Recommended parts & tools for P0404
Our buyer’s guides cover the tools and parts that pair with AXLY:
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