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

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

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Average mileage: 139,328 (118,657–160,000)
4 model years affected: 2007, 2008, 2009, 2010 more
9 people reported this problem
3 people shared problem details
replaced, gas cap and removed negative battery term for2 min. light went out.
2007 GMC Yukon Denali118,657
Check gas cap light came on, tighten gas cap. A day later the light came on again. We replaced the cap. A week lated it happen again.
Got a diagnosis with a code using the code machine...the code could have been a couple things related to gas, but it was determined that it was just that the gas cap was too loose ....just replace the cap.
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i just put a new engine in a 1999 gmc yukon denalie it has a rebuilt transmission with less tha...
Fuel milage has decreased significantly due to such.

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