Question about 2012 Chevrolet Impala LS Sedan 3.6L V6 FFV 6-speed Automatic

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I just bought a 2012 Chevy Impala. The gas cap never tightens. Is this normal?

Gas cap ever tightens but no check engine light on, yet. I'm trying to prevent having an issue. Should I replace the gas cap?

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Some gas caps have a built in slip preventing over tightening, so no engine light, no worry. The cap will feel like a ratchet effect when you tighten, so it slips at point it is sealed so you don't crush rubber seal. Not to worry as I see it.
CERACOAT-NANOTECH.com

Posted on Apr 21, 2015

Testimonial: "Thank you, Mike Sullivan. Every car I've ever owned developed issues if the gas cap did what this one does. They always clicked tight & if they didn't - problems. Your answer takes a load off my mind. Thanks again"

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The dash panel on my car keeps telling me to tighten my gas cap,


Assuming you mean the gas cap being replaced, this can also be the result of a vacuum leak. Look around on the engine and see if there are any vacuum hoses related to the fuel system. If your engine has a plastic cover it is under that. Remove the cover. Most are held down by the oil fill tube which generally unscrews, sometimes reverse threaded.

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The gas cap is most likely faulty. The gas cap is an integral part of the evaporative emission system. If it is not sealing or venting properly, it can affect the proper operation of this system. I would replace the gas cap and have the check engine light reset at an autoparts store. Most stores will scan/reset computer for free. Hope this helped and best wishes.

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i had same problem purchase new gas cap only ten bucks at wal mart. If still have problem e vac leak

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On a 2006 chevy impala it tells you to tighten the gas cap ,then when you do, we shut the car off. Then check engine light comes on. Where is the sensor located.


There is no sensor for a loose gas cap. What is happening is that the evaporative emission system is sensing a "Large Leak". Usually code p0455. The computer sees this as the most probable cause is a loose gas cap depending on several factors it looks at. You would need to clear the code(s) and see if that was the problem. If the light comes back on, then you have a problem in the system that will not let it seal. Possible solenoid problem, leaking hose / line, etc.

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