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Originally Posted By: caravanmike evap vent solenoid is one of the components you can command open and close with the right scan tool. have a friend place their hand on it and command it open and closed with your scan tool. if no action that is the problem. If you read my post, a local dealer...

I will try the gas cap and report back. I clear the codes once by removing the battery negative cable but the CEL came back right away.

I have a CEL on my Pontiac Montana SV6 2008, 3.9 Flex Fuel engine, short wheel base model. It should be very similar to Chevy Uplander 07 - 08. A local deal pulled codes P00446 (Evaporative Emmission Control System Vent Control Circuit) and P00455 (Evaporative Emission Control System Leak...