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: 107,750 (63,000–189,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
11 people reported this problem
3 people shared problem details
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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