Trouble code
P0403
Exhaust Gas Recirculation Control Circuit
What P0403 means
The electrical circuit controlling the EGR valve is out of range.
Symptoms you may notice
- Check engine light
- Rough idle
- Failed emissions test
Common causes, cheapest first
- Failed EGR valve solenoid
- Open or shorted wiring
- Corroded connector
- Failed control circuit in the computer
Before you buy anythingThis is an electrical code rather than a flow code, so cleaning carbon will not fix it. Check the connector and wiring, then the valve itself.
What to do next
- Confirm the code with your own scan tool, or have it read free at a chain parts store.
- Decode your VIN so you know your exact engine and build date.
- Work down the causes above from cheapest to most expensive.
- Search NHTSA for a recall or service bulletin covering this symptom on your vehicle.
- Read the engine buying guide before ordering.
P0403 is a generic OBD-II code, standardized across every make and model sold in the US from 1996 onward. The meaning is the same on any vehicle; the specific part and its location are not.
Parts
Parts commonly needed for P0403
These go to Amazon. We earn a commission if you buy, at no extra cost to you — see our affiliate disclosure. Which one you actually need depends on diagnosis — read the note above first.
Confirm fitment against your VIN on the listing page before ordering. A part that matches your year and model can still be wrong for your build date or engine code.