You gas cap is not on tight enough to seal causing the Check Engine Light to come on. When you tighten your gas cap you need to tighten it until it clicks at least 5 times, if it is tight than the seal on the gas cap may be bad. Replace with a OEM GM gas cap or a quality replacement that meets OEM specs.
If sealing the cap tightly does not fix this, buy a new cap and try that. If it still isn't fixed , your gas tank is not sealing. Loose hose, puncture, could be anything that breaks the seal.
SOURCE: Pontiac G6 2006 check gas cap on info menu.
buy a new gas cap or get it diagnosed. Check the seal for cracks and check the filler neck the seal touches for cracks
Testimonial: "going to go get gas cap checked out thank you"
SOURCE: Engine check light comes on and stays on for
IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.
SOURCE: check engine light has come
You must get the error code read for the check engine light in order to get helped here. Bring your vehicle to a local autozone to have your vehicles computer scanned, its free or local shop (most charge for this). Post the codes on fixya for further assistance.
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