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code p0449 on 2007 Chevrolet Silverado 1500

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2007 chevy silverado classic. code p0449 light will come on and after a few days go off, then come back on. I have taken the solenoid and canister off and cleaned. also looked for leaks. have checked and tightened gas cap. when i reset the light it will stay off at least a day before coming back on. Thanks
(2) Answers
There is a service bulletin for the code p0449 setting on your 2007 Chevrolet Silverado 1500. The number is #09-06-04-028. The repair suggested is to replace the canister vent solenoid and relocate it to a position near the fuel filler neck. This may help but there is know way to tell for sure if this will correct your particular issue.