P0404: Exhaust Gas Recirculation Circuit Range/Performance
Severity: medium
What it means: The EGR valve isn't operating within its expected range. It may be stuck or not reaching its commanded position.
Safe to drive? Usually drivable. Stalling or a rough idle suggests the valve is stuck open.
Common symptoms
- Check-engine light
- Rough idle or stalling
- Hesitation
Likely causes, ranked
- Sticking or carboned EGR valveDIY
- Failed EGR valve position sensorShop
- Wiring faultShop
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What it means: The EGR valve isn't operating within its expected range. It may be stuck or not reaching its commanded position.
Severity: Medium. Safe to drive? Usually drivable. Stalling or a rough idle suggests the valve is stuck open.
DIY or shop?
Clean or replace the EGR valve. Electrical testing may need a shop.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.
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