Hello, I have a 2011 Compass when I bought it it had a whinning noise when i rev the engine, i did flush the transmission oil and filters the car drove fine for a month and now it wont shift same it throws the P0777 an P0730 i done some research on google bc I’m not a mechanic i have seen people say that it needs a new transmission eith this symptoms but it is crazy expensive even in junk yards my question is what if I replace the whole valve body you think it might take care of incorrect gear ratio as well?