I need more information about the codes that came up on my Dodge 2500, it is a 2003 model. the codes were po440 po441 and p2175. I am having trouble with the transmission not shifting smoothly. The check engine light came on and I took the truck to Advance auto parts as they will do a free check engine light. The parts man said it has a evaporation leak, evaporation purge and a throttle incorrect flow????? Before I spend a lot of money taking it to the local Dodge dealer, is there a way to fix these things myself? It was a bit low on transmission fluid so I topped it off, it helped a little but it is still not shifting smoothly. Thanks Randy