Okay I had a starting problem with my car popped up a u1000 code I changed the harnessed on the left side engine bay come to find out it was a starter relay so I changed it went to go put some air in my tire cut the car off and it wouldn't cut back on so I changed the starter relay again and it cut back on but on the way home my gear starts shifting funny I don't know what to do

 

My car did this exact same thing, burned out a starter relay, then my trans started acting weird, then went into limp mode, and wouldn't come out of limp mode for any reason no matter what I replaced. If you find a fix keep me updated