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

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

RepairPal Verified
Average mileage: 87,875 (35,000–189,000)
10 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010
21 people reported this problem
6 people shared problem details
Check engine light on for one day; checked gas cap and was loose so tightened it. Check engine light still on one week later
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.
Indicator light, diagnosis engine reports gas cap issue
This has happened twice that the check engine light came on with the message of tighten gas cap
Check engine comes on. A bottle STP gas treatment or dry gas fixes it.
Check engine light due to gas cap issue.
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