A Loose or worn gas cap may cause Check Engine Light to illuminate.Google+
Car Problem Reports
Chevrolet Cobalt Check Engine Light Due to Gas Cap Issue
Chevrolet Cobalt Problem
Average Mileage: 89,746 mi (43,000 mi - 173,180 mi)
Visitor, 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.
Visitor, 2008 Chevrolet Cobalt, 43,000 mi
Engine Light came on and Check Gas Cap message appears
check engine light comes on after gas cap indicator comes on and stays on
Visitor, 2005 Chevrolet Cobalt, 100,000 mi
Same issue as everyone else... I have had so many issues i would never buy a Colbolt again
Visitor, 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!
Visitor, 2005 Chevrolet Cobalt
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.
Visitor, 2007 Chevrolet Cobalt
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!
Visitor, 2008 Chevrolet Cobalt, 65,000 mi
gAS CAP SPINS AND WON'T FIT SNUG - CHECK ENGINE LIGHT ON AND MONTITOR FLASHES CHECK GAS CAP
Visitor, 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.
Visitor, 2006 Chevrolet Cobalt, 85,000 mi
check engine light on...no problems...car run great