Check Engine Light Due to Gas Cap Issue on Pontiac Grand Prix

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

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Average mileage: 122,334 (28,000–210,000)
7 model years affected: 1996, 1998, 2004, 2005, more2006, 2007, 2008
83 people reported this problem
38 people shared problem details
check engine light is on. I get a message to check gas cap. I replaced the gas cap but am still getting the same message.
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i had 2 codes one catilac converter had that repaired po455 code had that checked smoke test found no leak went to gm dealer got new gas cap how long does it take before check engine light goes off
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Why does the information center ( where the day and date, odometer etc. are displayed ) in my 2006 Pontiac Grand Prix V6 3.8 liter always say check gas cap? When I fill up my gas tank I always make sure to click my gas cap three times to make sure it's closed. And by the next day my information center will say check gas cap and when I do, sure enough it is loose. I bought another gas cap (kind of a generic one) and it still does the same thing. I went to a Pontiac dealer and asked them and they had no idea. they told me to replace the gas cap. So once again I bought another gas cap that I purchased from the Pontiac dealer that is exactly the same as my original gas cap. And again my car keeps saying check gas cap! I've search the web and find nothing to help me with this problem.
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Check gas cap indicator keeps coming up. Checked the cap several times, then replaced the cap. Still comes on.....
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Ive had this problem continuously for pretty much the lifetime of the car and I bought it new. Replacing the gas cap has not solved the problem.
Changed Gas Cap still has indicator light for check gas cap
New gas cap did not fix the problem. Throwing code P0455 - EVAP system leak (large) - customer had to take car on trip and will drop it back off when they return.
Check engine light came on. Problem was corrected by installation of a new gas cap and gas line filter.
car indicated gas cap failure on service screen - replaced cap and warning cleared itself.
Light in car indicated gas cap loose replaced gas cap still not fixed issue.
Check gas cap, not fixed
I've had this happened to me as well after replacing cap for the third time I found out I had a small leak in the evap. fuel emission canister which I have to have replaced
My check engine light came on. Problem diagnosed was loose fitting gas gap. Bought new cap and light went off.
I am having the same problem and I have already bought a new gas cap to replace the old one and it is still throwing a code as well as the check engine light being on and it tells me the gas cap is loose.
I was told that my vapor canister may be defective and was causing my engine light to come as well the gas cap sensor even thought I had it replaced
i have had issues with this car but this issue check gas cap came on called gm told me to replace gas cap got new one from gm at a cost of coarse light went off for about a month came back on
I had the Check Gas Cap on the screen above my radio, and then it threw a check engine light about a week later.
Keep saying check gas cap and now the Service engine soon lite is on
My check the gas cap light comes on.
I have the same problem but have not found a solution. A new gas cap did not work...
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