Edmunds Answers



  • actualsize 03/22/08 3:29 am PST

    I don't know the 0449 code answer. All I can say is that I've had a gas cap problem, and mine looked OK, too. But it didn't make the proper seal in a vacuum test, so I had to replace it.

  • canddmeyer 03/22/08 4:16 am PST

    I agree with actualsize. Either pop the $20 for the gas cap, or if you got some time to burn, take it to the dealer and have them check it out. Most emission control equipment is warranted for 8yrs or 80,000 miles, whichever comes first. I'm NOT sure if the gas cap is covered under that, so either call your dealer service dept. for the answer or refer to your owners manual which may list the covered emission control eqpt.

  • 2doorpost 04/08/08 1:04 am PST

    Same here- 2005 Silverado- same codes at 36000 miles- Took in to Dealer- TSB item-
    Solenoid vent valve was bad (this was after they replaced the gas cap)
    Top vent valve is located on top of the gas tank.
    Common problem due to "topping off" of gas tank. Leave space in tank when filling up, do not let Gas Pump "Click" off- it prematurely wears out the valve.


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