P0404 - Exhaust Gas Recirculation Circuit Range/Performance

EGR control signal or valve position is outside expected range.

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 test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

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