tallicazx6

It ended up being a blown fuse for the transmission controller, all good now!!

This problem showed up BEFORE I replaced the ignition switch, sorry I should have clarified that. I left the battery unhooked overnight and tried again just now, still no luck.

I had a problem with my battery draining over night and I finally got a chance to try to figure it out. I put an ammeter on the battery and one by one pulled each fuse until I figured out which circuit was causing the problem. I think I traced it to my ignition switch, so I replaced that. But, now I have transmission problems, it will not shift and I have codes of P0740 P0785 P1860, all transmission codes. Is it possible that I caused this by pulling fuses and turning the ignition on, maybe messing up a computer in the process? I tried clearing the codes with my code reader, but they come right back. I am currently trying leaving my battery disconnected overnight and seeing if that might clear the problem. I had zero trans problems before my testing with pulling the fuses.