TorqueMech OBD Code Guide
P0404 - Exhaust Gas Recirculation Circuit Range/Performance
EGR control signal or valve position is outside expected range.
Code first. Confirm symptoms and checks before pricing parts.
Read code pattern
Check likely system
Estimate after confirmation
Explore Related Systems
Compare nearby repair families.
Code Overview
EGR control signal or valve position is outside expected range.
Common Causes
- Sticking EGR valve or carbon buildup
- EGR position sensor reading out of range
- Wiring or connector issue in the control or feedback circuit
- EGR valve not matching the commanded position
Symptoms
- Check-engine light with idle or part-throttle instability
- EGR command may not match actual valve position
- Failed emissions test or stumble during light load
Diagnostic Steps
- Inspect the EGR valve for sticking or heavy deposits
- Check connector condition and compare commanded position to feedback data
- Inspect the control and feedback wiring for opens, shorts, or poor contact
- Verify the valve moves smoothly before replacing parts
Repair Difficulty
Moderate
General difficulty estimate for the most common repair path.
Likely Repairs & Cost Guides
Confirm the repair path before pricing parts.
EGR valve replacement
Estimator-ready next step after the fault path is confirmed.
Related OBD Codes
Browse nearby codes when systems overlap.
Next Steps
Move from code to checks, then estimate.