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Gas Cap Not secure warning - 2005 Ford F-150

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If the Cap is clicking, time to replace the gas cap. The warning is for unmetered air getting into the system.

Posted on Nov 11, 2010


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2004 Malibu panel shows check gas cap

Check for applicable trouble codes, see if anything related to evap system? Your emissions system probably pulls a small vacuum on the gas tank and evap system to check for leaks, If it doesn't pass the test, you will get an evap code or gas cap lite? The place that replaced exhaust system can they check for trouble codes? Anything?
To check for codes, yourself, at the least, you need an obd 2 code reader.
I don't know if exhaust repair caused a problem or just coincidence?

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Why is "check fuel cap" warning showing on my 2006 Pilot when the cap is secure?

Hi there:
If the gas cap wasn't on properly then the change in pressure would set off a sensor. Put the cap on right or replace it and if the check engine goes away after a few days that was your problem.

You replaced the cap and it will take quite a few driving cycles for the light to go off if that was the culprit. Try disconnecting the negative battery cable for 5 minutes and that might reset the light.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 20, 2012 | 2006 Honda Pilot EX

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Why would gas cap warning light come on? 2007 dodge charger.

The gas cap warning comes on if the gas cap is not sealing the system properly, this can be a loose cap or a defective cap. There are other reasons like a defective fuel tank pressure sensor for the evaporative emission system ( The "evap" system retains fuel vapors and stores them to burn in the engine later during the purge cycle), but that is less common in this car.

Nov 07, 2011 | 2007 Dodge Charger SRT8 Sedan

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The gas cap loose warning light keeps showing on my dashboard display for my 2000 buick lesabre. I t is secure and clean. How do I remove this warning?

My gas cap was broken in the center so I replaced it with a new one and the tighten gas cap message went out after a couple of hours driving.

Aug 17, 2011 | 2001 Buick LeSabre

1 Answer

Yellow warning light that says check is on What does it want? In manual it says take to dealer

Take it to a Pep boys if you don"t have a code reader.
They will check out the computer code warning you are getting right noe.
The cost will be about $40 or 50 bucks.
The dealer will charge you three times that much,plus Pep boys will give you a up front free estimate if you need any repairs.
Bet it's the gas cap though.
Try tightening your gas cap and driving the car around far a hundred miles or so.
remember never put gas or loosen the gas cap when the engine is on.
The computer will pick up the venting like it would a leak,thus sending a warning code to the computer.

Nov 25, 2010 | 2005 Toyota Corolla

1 Answer

Gas cap warning light is on. Gas cap is tight.

If the cap is tight then you need to replace the fuel cap. the light will go off when cap is replaced

Jul 13, 2010 | 2000 Dodge Caravan

1 Answer

My warning light came on after i got gas/my

Not sure why the security light did not come on. But I'd start with the warning light.

There is a pressure sensor that is affected by the gas cap. If the cap was not on properly it will sense it and trigger the waring light.

Unscrew the gas cap and reinstall. Drive for a while and the light should go out.

Sometimes the computer will not clear the code. If this happens disconnect the negative terminal on the battery. Leave for half an hour or so and reconnect. This can delete the code sometimes.

Mar 07, 2010 | 1996 Nissan Maxima

1 Answer

I have a 2001 Cadillac DeVille DHS, 144K miles, runs pretty smooth except some warnings: 1. Check Gas Cap warning is always there even after I tightened the gas cap, 2. Service Engine Soon light is always...

Yes, first try securing it tighter. This means until you hear it making noise. Go to advance or autozone and have them reset the code. If it still turns the SES light on, replace the cap. My 2001 DTS did the same thing at 144K. You may be on the same track I am on. So far I replaced that, the EGR solenoid (get the Delphi brand) and now it looks like I have to replace my EGR vent. During this I also had to replace my fuel pump. Fortunately on this model it's easy to get to through the trunk. I ended up having to splice in a new connector. They don't come with the old one any more. Good luck.

Feb 19, 2010 | 2001 Cadillac DeVille

1 Answer

Check Engine Soon

and........what? What do you want to know? Bring it to a mechanic or Ford dealer service dept to troubleshoot what caused the indicator to light. Another possible is, on the last time you filled up with gas, did you make sure to put the gas cap on securely; this can cause a "Check Engine" light.

Oct 20, 2009 | 1999 Ford F150 Regular Cab

1 Answer

05 explorer gas cap warning light

Your gas cap could be losing pressure, bad seals. Most of the time the light goes on cuz no one closes the gas cap all the way, by rotating it right till they hear 3 clicks.

A light still on after 3 clicks, go to autozone, by a new cheap gas cap - under $20

Feb 26, 2009 | 2003 Ford Explorer

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