Eaton Transmission Code (Shifter?)

2018 LT
CUMMINS X15
EATON AUTO 3RD GEN


On startup, all seems fine.
When shifted into and gear...
sa 3 spn 751 fmi 8

So seems to go and shift.
The manual makes this sound like a shifter issue, but wanted to know who's seen this before.

Thanks!

 

Afraid I can't tell you much. It never affected my shifting and it never came back after that day. A few people have told me it could have been something as simple as moisture in an electrical circuit.

 

So this just came back.
If the truck is in neutral, there's no error code. Shifting to any gear caused the error to return.

 

That's what I'm wondering. It still seems to be operating correctly but I don't want to be far from a shop when it besides that it's done.
I've been told this can just be the shift controller that's there on the steering column and that's not hard to replace to replace. But I don't know.
I'm hoping Heavy chimes in.