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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 67,300 (35,500–130,000)
3 model years affected: 2007, 2008, 2009
13 people reported this problem
Comments
Viewing 1 - 3 of 3 comments
check engine light continues to come on about 1/2 tank full and code reads loose gas cap
Checked gas cap and is OK but light is still on
Engine Light came on. Service department hook the car up to the computer and the error message read that there was an issue with the gas cap. When checking the gas cap it was still loose not tight. Once gas cap was typing error message did not reappear.