code p0449 on 2007 Chevrolet Silverado 1500

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

by in Jefferson, TX on April 14, 2010
2 answers
ANSWER by on April 15, 2010
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.
ANSWER by on April 28, 2012
what is P0449
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