I have a 2006, Z85 crew cab, 2wd.
I'm dealing with the same trouble code! the fantastic (P0449)
I call to the dealer to ask about the Emissions warranty, they told me that this only cover the catalytic converter no more than that so is not life-long, or else at least here in Puerto Rico.
So I try to fix it by myself and begin with changing the gas cap, to see what happened, but nothing happened.
I tried to test my valve canister out of the canister, put some direct DC from the battery, but it doesn't make any move or sound. I don't think the valve is shut up, because I can blow through it, the voltage at the rear end plug is present when I put on the key "on".
Do you think I have a bad valve?
Any suggestions about how I can test the valve again to be sure? At the beginning the code comes on and off now is all the time on!
2006 Z85, 2wd, CrewCab.
Vent Visors, Fram Boost Intake,
Rugged Bed Linner, Front Tinted Windows,
Turbo Muffler with tip, High Beam & Fog Light Switch Kit.
Cooper S/T, 31x10.5xR15 Tires, 2'' Bubaloo Shackles, 2'' Front Strut Spacers.
6 1/2" Almani Speakers.
Soon: Roof Rack, Decals, Costume made light bar...