Check Engine Light Due to Gas Cap Issue on GMC Sierra 1500

A Loose or worn gas cap may cause Check Engine Light to illuminate.

RepairPal Verified
Average mileage: 57,000 (42,000–69,000)
2 model years affected: 2008, 2009
7 people reported this problem
1 person shared problem details
check engine light continues to come on about 1/2 tank full and code reads loose gas cap
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Service technicians have checked repeatedly and find nothing wrong.

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