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I just replaced the electronic valve in the canister and nothing else, I think there's another emission purge valve under the intake manifold cover but I haven't changed that. I just removed the canister at the rear of the truck and removed the "Vent solenoid" and matched it on rockauto parts...

When I bought my 04 tahoe I had the exact same problem, took a long time to fill the fuel tank because the pump kept stopping and had the p0446 code. I don't remember where I found the fix but it's a fairly common problem and was pretty easy to fix and it worked! I definitely don't mind...

Hi Micheal, Had the same problem with my '04 tahoe and you need a Vapor canister purge valve as your is stuck closed, It is located around the spare tire under the rear of the truck and is a square plastic box with a few hoses going into it. The purge valve has an electrical connector and...