Vehicle is giving p0440 dtc. I have replaced the gas cap cleared the dtc and it appeared again yesterday with the same dtc. Also the evap vent solenoid was replaced about 6 months ago when I had this problem. The vehicle is a 2003 sunfire with no warranty left (150000 km). It is running fine except it has a small exhaust leak at the muffler's intake port. What else could the problem be?

search for P0440

its been brought up a few times before

Thanks JB!!! Looks like my searching skillz need some refining.

Cheers!