Question about 2005 GMC Sierra

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Tighten gas cap message, check engine light is on

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Replace the fuel cap.

Posted on Jul 10, 2010

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6 Suggested Answers

6ya6ya
  • 2 Answers

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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

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

  • 7 Answers

SOURCE: on a 2006 chevy impala it tells you to tighten the gas cap

Probably EVAC leak i had same problem

Posted on Jul 15, 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

  • 7353 Answers

SOURCE: 2006 Saturn Relay Check Engine Light

PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.

Posted on Nov 12, 2009

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


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.
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I have a 2003 cadillac cts. the other day i was driving out of nowhwer a message comes in the screen saying "gas cap adjustment" or something like that n next thing you know my engine light came...


You shouldn't have anything to worry about. A loose gas cap will throw a check engine code in most newer vehicles. As long as you tightened it up, you are fine. The light sjould go off on it's own before your next refill, but if it doesn't take your car to an Advance or Autozone and they will clear the code for you for free. There is no danger in driving your car with the light on for this trouble code. Have a great day.

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computer is seeing a large evap leak. most common cause is gas cap left loose this is why it is throwing up that message. since you have already done that we know there is a leak somewhere else. look underr vehicle and should see a black rectangular box close to gas tank this is the evap canister check the lines hooked to this and just do a visual inspection of hoses see if one has come off. may need to have it checked out we have a machine that hooks into system and pressurizes with "smoke" the smoke leaks out of the problem area and helps diagnose .

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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.

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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.

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1 Answer

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

Apr 18, 2009 | 2003 Chevrolet Suburban 1500

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