Hey i want to say thank you to every one that has helped me so far with my issue of the P0449 and P0455 codes. Im still having some issues. i have read on some other forums that a vent valve solenoid that is suppose to be for a cavalier will work on the silverado and the cost of the part is cheaper. Has anyone heard that? if so is it true? and if so what year cavalier/engine works with the 06 silverado with the 5.3? Also has anyone found this part some place cheaper than the dealership? if so where and does anyone have a part #? I dont really want to shell out the $150 for the part at the dealership if i could of got it someplce else for cheaper. Again thank you to everyone in advance for your help.




Have you checked the charcoal canister that the vent valve connects to? It could be dirty or plugged and it's free to check and clean it. Pull off the hoses and make sure they are clean and also check where they connect to the canister to make sure the hole isn't plugged.
Also check out this thread:
http://www.gmtruckclub.com/forum/showthread.php?t=13703
Last edited by GaryL; 06-09-2009 at 11:08 AM.
Gary
99 K 1500 Suburban
78 Silverado Big 10 w/factory 454
1977 Formula
1976 Trans Am
1980 Honda CB900 Custom
i had it smoke tested at the dealership and they told me that vent valve solenoid is in op and needs to be replaced.
Jim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Bilstein Shocks
Linux Bed Liner
Tinted Windows
Other rides:
1967 Landcruiser <350 Chevy>
1970 Camaro
1990 Geo Metro Convertible
2007 FJ Cruiser
Wow! Well thanks! Ya know not all of us are made of money so sorry if my thread bothered you. I along with many others have probably ran into this problem so was looking for a cheaper solution. And I found it! The exact part that came off. So for anyone that has had this problem and doesn't want to spend the $300 to run extra hoses the AC Delco part #25932571. Hope this helps others and the truck is running just fine. Thanks for the help.
Jim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Bilstein Shocks
Linux Bed Liner
Tinted Windows
Other rides:
1967 Landcruiser <350 Chevy>
1970 Camaro
1990 Geo Metro Convertible
2007 FJ Cruiser
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