Check Engine Light Due to Gas Cap Issue on Chevrolet Cobalt

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

RepairPal Verified
Average mileage: 86,411 (12,000–173,180)
6 model years affected: 2005, 2006, 2007, 2008, more2009, 2010
41 people reported this problem
18 people shared problem details
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.
11 people like thisFlag inappropiate
2005 Chevrolet Cobalt100,000
Same issue as everyone else... I have had so many issues i would never buy a Colbolt again
7 people like thisFlag inappropiate
Engine Light came on and Check Gas Cap message appears
7 people like thisFlag inappropiate
check engine light comes on after gas cap indicator comes on and stays on
7 people like thisFlag inappropiate
check engine light on...no problems...car run great
6 people like thisFlag inappropiate
2005 Chevrolet Cobalt135,600
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!
4 people like thisFlag inappropiate
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.
3 people like thisFlag inappropiate
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!
2 people like thisFlag inappropiate
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.
2 people like thisFlag inappropiate
gAS CAP SPINS AND WON'T FIT SNUG - CHECK ENGINE LIGHT ON AND MONTITOR FLASHES CHECK GAS CAP
1 person likes thisFlag inappropiate
Have been repair for a gas leek 1 week ago. Check Engine Light Due to Gas Cap Issue
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!
Check engine light camr on after getting new belt for car.
i bought a new one and just replaced it but if this is major issue GM should replace them.
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
Seems like I notice this problem after heavy rainfall.
2005 Chevrolet Cobalt173,180
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?
2006 Chevrolet Cobalt117,000
Check engine light for loose gas cap. Turned out to be a leaking and cracked fuel pressuriztion device near the gas tank.
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