Question about 2006 Chevrolet Silverado 2500HD 2WD

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Difficulty filling gas tank '06 Silverado 2500 HD 6.0 4x4 w/125K

I just bought a used truck, and the check engine light has been on since my purchase. The engine appears to run without problems. When getting gas, the filling nozzle shuts off prematurely (on a partially full tank). The Chevy dealership says it's probably a bad gas vent charcoal canister. I want to repair/replace it myself, but haven't located this canister (and don't have a repair manual yet). I've read of leaking hoses and bad solenoids on this canister, but have also read of a valve somewhere close to this canister that is notorious for going bad.

I plan to buy a repair manual, but would appreciate your suggestions as to probable / possible causes of the problem.



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  • antq May 09, 2009

    So the only way to tell WHY the 'check engine' light is on is to pay a repair technician to run computer diagnostics? (or replace things one by one until the light goes off?...and will the light go off automatically when the faulty part is replaced, or does the computer have to be reset???)

  • dugun1958 May 10, 2009

    04 silverado 2500 HD just started having trouble filling gas tank I have checked fuel inlet and breather tube all good Is there somthing just in side the tank that is stuck or maybe a presure releif valve?

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  • Chevrolet Master
  • 3,854 Answers

Well come to the GM World. The filler tube to the gas tank is small and i find it to be the same on my Jimmy and my wife's Montana.
When filling, try starting off slow. Then gradually pull on the trigger more, as you fill the tank with gas. The fluid going in back's up with the air coming out. When you start off slow then pull on the trigger more you give the gas going in and air coming out time to create a path through that they can don't really interfere much with one another.
After a while you'll find a certain way (eather tilted to the left or right) to place the Gas pump nozzle in the filler tube to keep it from cutting off on you.
Good luck and hope this helps. If there is anything wrong with the EVAP. Charcoal canister, vacuum tubes or valve, your Service Engine light would go on. The ECM monitors all of that and would save a DTC in the ECM's memory to be retrieved by a technition's scanner.

Posted on May 09, 2009

  • Harvey N Tawatao
    Harvey N Tawatao May 09, 2009

    The Computer cycle it's self every time you start the truck, when the faulty part has been replaced 95% of the time the check engine light or service light goes off.


    Most larger Auto part store like Auto Zone or Parts Source will scan your truck for free and will have the step by step instruction to replace the faulty part.


    There are just to many things that could be causing your check engine light to be on, It ranges from just a faulty Gas Cap to a Bad O2 Sensor. Both will really have no symptoms of drive ability and you have always had the truck like that sine you bought it so you really don't know if your getting bad or good gas mileage.


    Good luck and hope this helps. When you do get the truck scanned, have them reset it and drive around for a day first to see if the check engine light comes back before buying the part. It may have been an oil problem that the computer could not reset it self without a technician's scanner.


    The other thing that would also set the DTC light is time for a Transmission service, when the transmission filter starts to get too dirty the fluid pressure drops it will be with the DTC too. Like i said there are just to many things that can set the DTC to go off.

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Posted on Jan 02, 2017

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