Question about 2005 Buick LaCrosse

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Check gas cap message

My check gas cap light keeps coming on after i already replaced the cap

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Do you make sure to turn the cap till it clicks about three times? Have checked the cap to make sure it is not bad and has a leak?

Posted on May 15, 2010

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1 Answer

Tighten Gas Cap message, followed by the check engine light.


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

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What's your problem? check gas cap light is on and i already replaced the cap


Take the vehicle to a qualified repair shop an have the EVAP system smoke tested , this will find the leak . Too many thing's that could cause your problem . You don't want to keep replacing parts do you ? Could be a stuck open purge solenoid , a leak in one of the vapor lines , the part the gas cap screws into, vent valve stuck open . Service engine light on ? have checked for DTC'S - diagnostic trouble codes . You'll probably fine a evap code for a large leak.

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CHECK GAS CAP MESSAGE COMES ON


when the light comes back on again take it to your neighbor hood auto zone auto parts they can do a diagnoses for free and tell what the problem is.

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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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The system is set up by GM to have the cleared with a codes cleared by a OBIII hand held device which can be purchased at many auto parts stores. Auto Zone can clear it for you for free if you ask them to do so. If the code does come back you may want to purchase a factory fuel cap instead

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My engine light stays on and the message "Tighten fuel cap" keeps coming on and off on my esaclade ESV 2005. Is there a recall for this?


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.....

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By "Replace the gas cap", do you mean put it back on, or buy another one? If you fuel these trucks with the engine running, or don't tighten the gas cap, the light will come on. It will also come on when the seal in your gas cap goes bad. I have had to replace the gas cap on my jeep and dodge already. It fixed the problem both times.

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