P1404 — EGR Closed Position Performance (valve stuck OPEN)
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1404 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1404 means on specific makes
Chevy / GMC / Cadillac / Buick CAUTION
GM-specific EGR fault — the EGR valve isn't reaching its commanded CLOSED position; it's stuck partially open, almost always from carbon buildup. Can cause rough idle, surging, and a check-engine light.
- Carbon-clogged EGR valve ($0-30 clean, $80-250 replace)
- EGR pintle sticking open ($80-250)
- Wiring fault at EGR ($20-100)
Check first: Remove and inspect the EGR valve for carbon buildup/a pintle stuck open; clean or replace.
Source: engine-codes.com / TroubleCodes.net P1404 (audited)