GMC Yukon XL Denali Problem Report

GMC Yukon XL Denali Check Engine Light Due to Gas Cap Issue

(9 reports)

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

Was on the freeway. Lost almost all power/acceleration. Pulled off freeway and called dealer. Check engine light was on. Car lurched along when trying to go. Dealer said maybe gas cap was loose. Opened gas cap, turned tightly to hear three audible clicks, then started and stopped the car 10-12 times (per Dealer instructions) and the problem went away. Same thing happened to my sister's 2000 Denali. Same solution worked. -
Check engine light on for one day; checked gas cap and was loose so tightened it. Check engine light still on one week later -
Indicator light, diagnosis engine reports gas cap issue -
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