P0404 — Exhaust Gas Recirculation Circuit Range/Performance
Category: Powertrain Severity: Medium
Updated:
DTC code P0404 means: Exhaust Gas Recirculation Circuit Range/Performance. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include faulty EGR valve stuck open or malfunctioning, faulty EGR position sensor and wiring/connector issue; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty EGR valve stuck open or malfunctioning
- Faulty EGR position sensor
- Wiring/connector issue
- Carbon buildup affecting valve movement
Symptoms
- Rough or unstable idle
- Engine hesitation or stalling
- Check engine light on
- Possible failed emissions test
How to diagnose it step by step
- Compare desired vs actual EGR position.
- Clean the valve.
- Check the position sensor.
- Replace the valve if it doesn't follow the target.
How to fix it
Check the EGR valve for carbon buildup that could keep it stuck; clean or replace it if needed. Test the position sensor and its wiring separately before assuming the valve itself is bad.
Estimated repair cost
$100–650.
Frequently asked questions
What does DTC code P0404 mean?
Exhaust Gas Recirculation Circuit Range/Performance.
Is code P0404 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0404?
Yes, carefully.
Related codes
P0403 P0405 P0402 P0406 P0401 P0400 P0410 P0411 P0420 P0421
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