GMC Yukon XL Denali Problem Report
GMC Yukon XL Denali Check Engine Light Due to Gas Cap Issue
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
This has happened twice that the check engine light came on with the message of tighten gas cap - Visitor
Check engine comes on. A bottle STP gas treatment or dry gas fixes it. - Visitor
Check engine light due to gas cap issue. - jabureh
FLUTTERING NOISE WHEN I ACCELERATE AND CHECK ENGINE LIGHT BLINKS
One or both secondary air injection check valves may become restricted causing poor air flow re...
WHEN I CHECK WITH ONSTAR DIAGNOSTICS THEY SAY IT IS NO LONGER A PROBLEM BUT HAVE IT CHECKED IF...
how do you get the light to go off?
after changing plugs, wires, battery, fuel filter, altenator checked ok, air filter. My problem...