Wiring issue? 2003 Galant

Hey guys, my sister has a 2003 Galant that has recently given me some issues. I had gotten a check engine light with the code P0705 as well as my transmission starting to move slow and and it's like it's stuck in one gear. It also jerks when I go into reverse. My speedometer also stopped working at that time as well. I also realized that my reverse light don't come on and my ABS(or I think it's SRS) light is on as well. Ive really needing to get this car back on the road as I will have to use it till I can get another car.