Autoshift gets stuck in 10 gear

[RojoPete]

(09-26-2016 )sbtrucking Wrote:  Have isx with 10 speed autoshift on 2012 cascadia,
It gets stuck in 10th gear and does not downshift in
auto or manual mode, need to stop turn the engine off
restart and goes back to normal, it did this 3 times
last week within 5+k miles.
Anyone experiencing same problem or knows what can couse this?

I had this happen to me on a 05 387 Peterbilt. Wouldn't go into gear, transmission would beep at me, also got stuck in 10th. It was the input shaft sensor located on the top of the transmission. We had to break it apart and take it out piece by piece a bear to take out. I was told to disconnect batteries for 15 minutes, that did not work. Hope this helps.