P0446

it's a blocked vent line someplace in system it needs to be smoke tested in order to fix this.

I have already smoke tested. Cleared the vent line.pulled down gas tank to check all lines and conections.checkEd evap filter. Made sure it was clear.

how about vent line to tank?is the vent link kinked or pinched? does solenoid operate

Vent line to tank is open. Replaced solenoid and checked it.

from the factory the evap system is checked with 3 psi air pressure. try applying that much and see if one of the hoses isn't opening and maybe soft and collapsing. other than that I don't know what to tell you, especially since you smoke tested it and replace solenoid. unless it's a connection or pcm problem which you can check with an ohm meter.

Here is an article with video to show you how to fix it

https://www.2carpros.com/articles/evap-system-code-repair

Let me know what you find

I had the same problem with a 2001 chev impala to fix it I had put a little form a gasket on the evap lines at the engine the small o ring inside evap line no good put form gasket on inside line with Q tip and on pipe now no more p0446 done to a couple of autos work good for all of them.

THE O RING DOES NOT SEAL AS TIGHT AS NEW SO TRY FORM A GASKET TO SEAL THE EVAP LINES AT INTAKE SHOULD HELP FOR THAT CODE P0446

You can try a new line or a larger is diameter O ring. The system must be air tight.