2017 Eaton Autoshift Smartshift problems

Hey

I have a 2017 freightliner with 2 pedal eaton auto, I think it's a smart shift. With a detroit DD15

The truck won't go up gears after it has downshifted, the best example is when you are pulling a hill, you hit the hill in top gear at top speed, as you are pulling the hill the truck will down shift normally, but when it's time to upshift again it comes up with no datalink and sometimes will have an F on the transmission, sometimes you have to pull over and kill the batteries to get it to go again.

I am thinking it's a speed sensor, XY shifter or the harness, just wondering what I should try first / look out for etc.

Any advice?

Thanks

 

I changed the XY shifter, reckon it was probably one of the sensors on the XY shifter, but rather then changing the sensors and guessing etc, I just changed the whole unit, mine seemed original, so with 800k miles on it I just thought it was worth replacing. My mechnis said they dont last forever and do wear out