P0404 - Exhaust Gas Recirculation Circuit Range/Performance

EGR control signal or valve position is outside expected range.

Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.

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

1. Inspect the EGR valve for sticking or heavy deposits
2. Check connector condition and compare commanded position to feedback data
3. Inspect the control and feedback wiring for opens, shorts, or poor contact
4. Verify the valve moves smoothly before replacing parts

Repair Difficulty

Moderate

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.

Related OBD Codes

Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.

Next Steps

Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.