I have a 2012 f150 lariat V6! Starting having shifting issues! Won't come out of 1st but if I stop and turn my truck off it somehow resets! That worked at for awhile but getting worse! Took it to shop to have it hooked up to his machine and it said speed censor! Then he said it may fix it! Could be transmission wiring harness! Any suggestions?

 

Which speed sensor was the fault codes for? Better yet what is the fault code.
Sounds like the leadframe needs to be replaced, there is a recall, go to a ford dealer, be aware that ford corp has cracked down on this recall and is making dealers provide extra proof of the fault before sending the new leadframe to them. It took 2 weeks recently to get one recently.

 

Thanks, Scott, for the info and update.