Check Engine Light Due to Gas Cap Issue on GMC Acadia

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

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Average mileage: 67,475 (10,300–100,000)
6 model years affected: 2007, 2008, 2009, 2010, more2012, 2014
14 people reported this problem
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problem details
2007 GMC Acadia 54,000 mi,
so far, the only thing being talked about with the service center is a diagnostic check for $95 to tell me what the issue is. then it will be on to parts and labor. come on GMC, you can do better!
2009 GMC Acadia 89,000 mi,
Check engine light comes on. Replaced original gas cap with a locking gas cap, light turns off and stays off. Can't stand the locking gas cap. I removed the gasket on the original gas cap, turned it around and put it back on the cap. Put the original cap back on. Light stayed off for about a week. Then it came back on. Tried the locking cap again, light would not go out. Played around with the gasket on the original cap and got the light to go out again. I am now looking for an OEM cap to replace the original with.
2007 GMC Acadia 100,000 mi,
I think that is what is wrong now.
2008 GMC Acadia 90,000 mi,
Got a new gas cap
2010 GMC Acadia 40,000 mi,
Gas cap had not been properly tightened to "locked" position, unbeknownst to me. My check engine light came on, and my awesome mechanic figured out the gas cap was causing it (without charging me a dime).
Check engine light is on due to gas cap
first loose gas cap indicate warning light came on then the check engine light ca Me on