While looking for the location of the vent/solenoid for you, I came across a blog that said this error can be caused by a loose or faulty gas cap. You may want to look at that first and possibly solving the problem. Replace the cap, get autoparts store to reset the code and see what happens.
Call the dealer
or call the local salvage yard and all you need is year make and model and 50 bucks
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yes, I think I have found the part, but I am having trouble locating the existing one. I read that it is at the gas tank on the drivers side. I did not see it there. Is the in a different location for 2006 model GMC?
Have you tried your local auto parts store? Be sure to have know your model (there are 7 different GMC Sierra models) and engine size (there are 7 engines available in 2006) so the can look it up.
Have you figured out your problem yet? I have a 2006 GMC Sierra 1500 SLT 5.3 reading the same code of P0449 and P0445. I was told possible vacuum leak to check all the vacuum hoses and then to check the purge and vent solenoid and EVAP canister. I refuse to go to the dealer cause they charge an arm and and both legs...I think i am going to take to a local shop to run a test on the hoses first..before I start guessing on parts to replace cause it can get kinda pricey..Advance Auto Parts can order the parts and Autozone does not carry...
Let me know if you figure your problem out it would be a great help as I have been dealing with this for a year now.
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