Check Engine Light Due to Gas Cap Issue on Pontiac G6

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 106,986 (160–988,886)
5 model years affected: 2005, 2006, 2007, 2008, more2009
95 people reported this problem
53 people shared problem details
2005 Pontiac G680,000
2006 Pontiac G675,000
For months now the dash will beep and flash "Check Gas Cap", we've changed the dang thing twice now and this still keeps coming back. Only happens after we clear the code and then gas is put in, and it does not just go on and off, it stays on until the code is cleared again, then stays away until gas is put in. Annoying to say the least...
I've put grease around the ring of the cap, replaced the cap (twice) and light still comes on .... now I see why this was the last year for G6's to be made ... sheesh
"Check Engine Light" stays illuminated when car is on. Replacing gas cap did not fix problem.
2006 Pontiac G690,000
Tried tightening cap deal and same results. Replaced cap and same results. Had AutoZone read codes and cleared. Code was gas cap. After clearing lasted 2 days! Very annoying, don't know if I have another problem (with gas cap crap, check engine light; or a real problem). Now I do a search and find many other people having same problem. This the only real problem I have had with the car and love scoot power of the V6 when I need it,along with 30+ MPG! Looks to me like a design flaw whether intentional or not! Beginning to wonder about and I am going to check for a recall or service bulletin.
Replaced gas cap twice, lines checked for vacumm loss, sensor replaced, still having the issue
2007 Pontiac G643,120
Not fixed yet...... 2 gas caps ( aftermarket and 1 factory cap. I get the chweck fuel cap and then the check engine light. Now what?
2006 Pontiac G671,000
Replaced Gas Cap, Service Tech has already smoke checked. They can't find anything yet the light is still on. Sometimes can't start in the morning.
2006 Pontiac G629,100
gas cap comes loose and have to open and close and then it will engine check light goes off. Then the next day or two it does the same thing. Have replaced it once and will try and replace it again. Crazy. How or why does it always work it self loose?
2006 Pontiac G660,000
Check engine light will come on due to issue with gas cap
2007 Pontiac G6137,000
.Engine light keeps coming on after putting gas. Took it to dealer no problem found. Car has lot of highway mile but runs excellent .
2005 Pontiac G6120,000
Cap warning light and now engine symbol is on. Gas guage goes all the way to empty when on 1/4thh of a tank. Today the car stalled and cut off like I ran out of gas, I had to pull over and then I restarted the car and Drove it but gas guage went all the way down to empty!
I bought my 2005 Pontiac G6 used. One day I put a CD in the player and it didnt work. My CD is still stuck in it. Then right after that happened. (minutes after)My "check gas cap" light came on. I pulled over checked it. It was on. The gas cap seems like it is worn out. I dont know. Its hard to get it off and on when getting gas. Gonna get a new cap and see if that works. I also noticed that when I start it I have to rev the gas so it starts.
First the "check gas cap" comes on, then check engine light comes on. I have replaced the cap twice. This problem is so very annoying. The dealership wants $90 just to hook it up to their computer to detect the real problem; however the $90 does NOT go toward the repairs, it is the cost to diagnose the problem. The dealership mechanic says it has to do with a leak within my emissions system. I really love my G6, but I have had to pay for replacements of parts even when it was still under warranty. Now I am finally getting the possible reason that GM cut the Pontiac division and the "G"series were discontinued. Both my keyless entries (remotes) stopped working at same time some for (4) years ago. The dealership said this is very normal, the remote generally goes out after about 3 years.
engine light comes on intermittently, usually within a few miles after getting gas
2005 Pontiac G6220,000
Check engine light and check gas cap light on constantly.
Many problems with this car.. Starting off with the roaters, the have been turned,shaved, replaced and still not good enough, check gas cap light always on!! I can't wait to get rid of this car!!!!
2006 Pontiac G6988,886
At the dealership in a few months ago.
Would like to get estimate of cost to replace.
2008 Pontiac G698,885
Engine light came on. Had it tested and the machine showed worn gas cap. Still smell gas after gas cap replacement and now it seems aa though it wants to flood out when cranked after it has been sitting for over 6-8 hrs.
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