I have a 2017 yxz that I just put the 2019 gear in 300 miles ago. I was riding and went to back up and it was stuck in neutral and threw a sh_15 code. Now it won’t go into gear at all and dies when I try to put it in gear. I pulled all connectors and it didn’t fix anything. Any ideas on the problem? I’m lost. Shift linkage is good and tight.