I am getting a tighten gas cap message, however cap is on and tight. Check engine light is on

Engine light on ,any DTC'S diagnostic trouble code's stored ? Have the EVAP system smoke tested .

there is a DTC error stored, in the ECU. (scan tools show this)
there is a car puter, error, message that really means
the gas tank is not holding air pressure.."EVAP sys"
and 99% of the time, that is "a loose gas cap"
it can take many driving cycle to clear this code.
or 1second with any scan tool, even a $30 tool.

The fuel cap needs to be tight or it will set a code. It's a pressurized fuel system. Try to tighten snug the code should clear itself. If this does'nt work exchage the fuel cap, it may not be working properly.

If they forgot to tighten the hose clamps on the hose from the tank to the filler cap it could be setting it off. If they are all tight it was probably just the gas cap. The gas cap is usually ALWAYS the culprit. Let me know if this helps

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.

Check engine light might have came on because of loose gas tank cap, but it's a good idea to read the code and check if it's not something else, you can take your car to an Auto Zone and they read the code for free and tell you the cause also. But if you want to reset the check engine light, only way is to disconnect the battery terminals and let it set overnight, check engine light will be reset. Hope it helps and let me know if you need more advice. Please don't forget to rate the answer it helps with my ratings, thanks!

your gas cap seal might be leaking making ur light turn on change ur cap

I'm having the same problem with my 2006 Escalade; replaced the gas cap for $40 and a week later still having the same issue.....

It's the gas cap sensor. Or you are getting a vaccuum leak somewhere.

seems that your vent hose on the tank is plugged so the tank is over pressurrizing sending the error code and not allowing you to fill it all the way unclog the vent tube and this will solve the problem