Question

Anyone else had the P1404 code show up on a 1999 Chevrolet Tahoe LS?

Answer 1

Hi there

This code points to a EGR valve that is stuck open. Sometimes carbon will build up on the valve and cause the pintal to stick open causing the problem. Here is some more info

P1404 CHEVROLET - Exhaust Gas Recirculation Closed Position Performance
Read more: https://www.autocodes.com/p1404_chevrolet.html