Check Engine Light Due to Gas Cap Issue on Chevrolet Cobalt

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

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Average mileage: 89,545 (12,000–173,180)
6 model years affected: 2005, 2006, 2007, 2008, more2009, 2010
55 people reported this problem
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Viewing 1 - 20 of 22 problem details
2010 Chevrolet Cobalt 38,000 mi,
Check Engine light is on solid. engine runs fine. checked cap and all fluid levels.. It does need windshield washer fluid but I do not know if this is a monitored item? any ideas
2006 Chevrolet Cobalt 85,000 mi,
check engine light on...no problems...car run great
2006 Chevrolet Cobalt 84,000 mi,
check engine light is on.Digital display read "check gas cap" once and the check engine light wont go off.After I pump gas it takes 5 mins for my car to start. Found out that this was because its taking longer for the pressure to build back up in the gas tank.
2008 Chevrolet Cobalt 43,000 mi,
Engine Light came on and Check Gas Cap message appears
I keep taking my car in for the problem and when I pick it up I'm told there is not a problem in the engine light remain off for awhile, but eventually come back on. The gas cap has be replaced but that did not complete the problem.
check engine light comes on after gas cap indicator comes on and stays on
2005 Chevrolet Cobalt 100,000 mi,
Same issue as everyone else... I have had so many issues i would never buy a Colbolt again
2008 Chevrolet Cobalt 65,000 mi,
gAS CAP SPINS AND WON'T FIT SNUG - CHECK ENGINE LIGHT ON AND MONTITOR FLASHES CHECK GAS CAP
2005 Chevrolet Cobalt 135,600 mi,
Check Gas Cap displays and Check Engine Light stays on. Already frustrated with the recalls I've had on this little car....Even though I received a new power steering motor AND new ignition at no cost to me, I am Seriously considering trading it in for something newer!
2005 Chevrolet Cobalt 173,180 mi,
I have no solution, says gas cap loose and check engine light is on....always. When they run the code it says there is an emissions leak?
i bought a new one and just replaced it but if this is major issue GM should replace them.
Gas cap light came on, followed by check engine light. And the dealers are not helpful when it comes from these cars! Just sick of it!
2007 Chevrolet Cobalt 66,666 mi,
Have been repair for a gas leek 1 week ago. Check Engine Light Due to Gas Cap Issue
2009 Chevrolet Cobalt 82,000 mi,
Problem still not fixed. Would not pass emission test had to pay extra 90 for computer analysis even though knew it was gas cap. Replaced gas cap, turned engine light off and had to take emission test again week later - passed. Now 3 days later, car flashes check gas cap and engine light back on. I guess I will have to pay an extra 90 dollars every year to pass emission test. What a joke.
2005 Chevrolet Cobalt 73,000 mi,
Check engine light camr on after getting new belt for car.
2006 Chevrolet Cobalt 77,000 mi,
My gas cap warning popped up last night and then on the way to work today. I just forgot to check it so on my way home the engine light came on and then the gas cap light too. I just ran a search to make sure I wasn't going to break down on a run to the grocery store later. Thanks everybody!
2008 Chevrolet Cobalt 83,125 mi,
Check engine light came on. Everything is fine. Went to check gas cap. Was so worn I can wiggle it out.
Car going in to gear hard sometimes when car has sat overnight
2005 Chevrolet Cobalt 60,000 mi,
I had the same issued. So I would suggest you to change the purge valve. Its only $12 and hopefully that will work.
2006 Chevrolet Cobalt 102,000 mi,
Light on; every once in a while I get a message on dash saying check gas cap