In recent months, I have replaced my gas tank, and whatever goes with that - costing a whopping $800.00, and this weekend replaced the tranny. Now it is giving me an OBD code of P0440. Which is what happened to begin with in the first place. The only thing they can tell me is that it is a malfunction exists in the evaporative emission control system. And no I am not a complete idiot, I do know how to replace my gas cap. Any ideas?

Welcome to the forum. This could be the fix to your problem:

GM PART # 22622023

evap vent solinoid valve

Welcome to the forum. This could be the fix to your problem:

GM PART # 22622023

evap vent solinoid valve

THANKS!!!!!