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.

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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
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problem details
2007 GMC Yukon XL Denali 51,000 mi,
Check engine light on for one day; checked gas cap and was loose so tightened it. Check engine light still on one week later
2007 GMC Yukon XL Denali 35,000 mi,
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.
2007 GMC Yukon XL Denali 86,000 mi,
Indicator light, diagnosis engine reports gas cap issue
2003 GMC Yukon XL Denali 100,000 mi,
This has happened twice that the check engine light came on with the message of tighten gas cap
2005 GMC Yukon XL Denali 63,000 mi,
Check engine comes on. A bottle STP gas treatment or dry gas fixes it.
Check engine light due to gas cap issue.