P0404 EGR Control Circuit Range/Performance
What does P0404 mean?
P0404 — EGR Control Circuit Range/Performance. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects egr control circuit range/performance. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0404
- Carbon buildup sticking the EGR valve
- Failed EGR position sensor or pintle
- Faulty EGR actuator
- Damaged wiring or connector
- Intermittent EGR electrical fault
How to fix P0404
- Compare EGR command to actual position on a scan tool
- Clean carbon from the valve and passages
- Test the EGR motor and position sensor actuation
- Inspect the valve wiring and connector
- Replace the EGR valve if the pintle does not track commands