Pete 579 2017 auto transmission issue

[Mezz519]

Hello everyone,

I’ll start with my equipment which is a peterbilt 2017 579 with ISX15.
It has a 16 speed eaton auto transmission.
Truck is sitting at 807 k miles.

Recently I had a transmission issue where when I turn the truck off and go to start it again my transmission light on my gear selector starts flashing, dash flashes between F and N, and truck will not starts. I have changed the ECA and had it recalibrated and the issue stayed. Then the shop reloaded the relays and fixed the starting issue, I believe they swapped out the harness too.

I took a trip out and have been driving roughly 6000 miles without issues.
Earlier I stopped, got fuel and the transmission started beeping and flashing N. Would not go in 3rd gear or anything lower. Only gear it would go in was reverse. When putting it in Drive all
You hear is spinning and not grabbing gear. Then finally I shut it off let it sit and started it again. It showed F on transmission and service light was flashing but truck went into gear and I drove off. Once it hit the 10th gear it would not go past it. Beeping at me and staying in 10.

I’ve read online this could be caused by bad wiring, a 40 amp fuse on the Gen1 ECA or bad voltage reading to ECA.

I’m at a rest stop now in Wisconsin. Will try messing around with it more tomorrow. Any suggestions?
I cleared the code using the switch on/off x6 but it still would not shift past 10. No more flashing F or service light by the gear selector.

Any help would be appreciated.
Thanks