Tighten Gas Cap Error Message

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.

There is a rubber gasket on your gas cap, normally that is the problem. If it doesn't seal tight enough the tank isn't pressurized and that sets the error codes. You can either replace the gas cap or replace the seal or add another rubber gasket.

On my Lincoln, I was getting that code quite a bit, even after replacing the gas cap, so I added another rubber gasket and haven't had that code again.

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.

This probably means:

• P1456: Evaporative Emission Control System Leak Detected (Fuel Tank System)
• Usually this is because your gas cap was not fully tightened. Be sure to turn it until you hear a click.
• After you tighten the cap, it might take a couple days of driving before the light goes-out.
• Be careful to tighten your gas cap regularly, because otherwise it puts a heavy strain on your emission system.

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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.

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.....

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.

Hi. this situation concerns a lose gas cap that you may have forgotten to tighten correctly during a recent fill up at your local gas station or, it could be that the original gas cap or replacement gas cap is not sealing the cap area correctly, preventing proper fuel pressure.

Check the gas cap to see if its tight and that it clicks when you turn it. make sure you turn until it clicks. this will ensure a secure fit.

Now, if you have just recently bought a new replacement cap, it may be the wrong fit and i would recommend purchasing the original replica form the dealership to ensure a tight fit.

Please rate and god bless:)