Question about 2006 GMC Yukon Xl Denali

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The check engine light is on and daily a display "tighten gas cap" goes on with the gas cap tight?

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  • Master
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The seal on the cap itself has gone bad,, replace the cap

Posted on Aug 02, 2010

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6ya6ya
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Posted on Jan 02, 2017

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keemo68
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SOURCE: Tighten Gas Cap Error Message

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

Posted on Apr 18, 2009

  • 116 Answers

SOURCE: Check engine light/gas cap will not stay tight.

yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.

Posted on Apr 24, 2009

Hightower971
  • 183 Answers

SOURCE: The "tighten fuel cap" message

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

Posted on Apr 24, 2009

canbruce75
  • 1776 Answers

SOURCE: I am getting a tighten gas cap message, however

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.

Posted on Aug 07, 2009

  • 752 Answers

SOURCE: chevrolet impala dash board said my gas cap need tightening

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

Posted on Mar 13, 2010

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1 Answer

Service engine light came on, was told it is due to gas cap not being on tight. Does this sound correct


This happens all of the time. The light usually goes out within a short time after the cap is tightened, up to a few days.

Even a strand of hair caught between the gas cap seal can cause the evaporative emission system to trip the warning light. .

Good luck!

Mar 28, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

Fix engine light


Not likely.... But as you just put fuel injector in make sure your fuel cap is tight cause if its not the computer will detect a evaporation leak in the gas tank. So tighten the gas cap and drive the car for a few days & see if the engine light goes off .. If not get the computer scanner to see what's going on

Feb 09, 2012 | 2005 Cadillac STS 4.6

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I have honda odyssey and the service engin coms on and the cod is p1456 so ineed to figur out thanks.


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.
-

Mar 03, 2011 | 2000 Honda Odyssey

1 Answer

Service engine soon light comes on


Have you checked the gas cap to see if it is on tight? If you purchased gas in the last couple days it might be the solution. Tighten the cap and drive a couple days to see if the light goes off. If the cap is loose, you might need a new cap.

Oct 14, 2010 | 2003 Chevrolet Blazer

2 Answers

Check Gas Cap alarm comes on and engine light is on


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.

Jun 16, 2010 | 2004 Pontiac Grand Prix

3 Answers

Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


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.

May 23, 2010 | 2003 Pontiac Bonneville

2 Answers

Check engine light came on Tuesday afternoon, after I filled the gas tank on Monday afternoon. If the check engine light came on because of the gas cap not being on tight enough, do I just tighten the gas...


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!

Apr 28, 2010 | 2002 Chrysler Town & Country

1 Answer

Chevrolet impala dash board said my gas cap need tightening


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

Mar 13, 2010 | 2006 Chevrolet Impala

1 Answer

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


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.

Aug 07, 2009 | 2007 Chevrolet Impala LS Sedan New Cars

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