18 speed Eaton transmission lost reverse

Hi fellows,
I’m working on my Volvo D16 with 18 speed Eaton Ultrashift transmission. I have been meaning to change the original transmission harness so couple days ago when I had a error code for the reverse light not working and the light stayed on. I replaced the transmission harness and the reverse light switch. The reverse light didn’t go off, still stayed on. I took the truck on a test drive and everything was fine except the reverse light. The truck has been parked for five days and yesterday I went to drive it now the truck won’t go in reverse. I don’t have any error code on the dash except the reverse light. I took it out for a 30 miles test drive it shifts up and down all 18 gears without any issues or noise but still will not reverse. When I shift to reverse in the box the R2 flashes and when I let off the clutch I get the arrow down on the left of the box with flashing R2. Check the clutch and it’s over half on the gauge. The clutch brake is worn on the clutch side I took it off and will put a new one on tomorrow, but I doubt if that is the issue because it has no issues going in gear forward and it shift smooth without any noise or sound depressing the clutch.
Has anyone had this issue and what was it. Thanks in advance!

 

It’s starting in the seconds gear as it has always done. Yes manual forward works fine and reverse it shows on the dash it’s selected and I can select from R2 to R1 back and forth but it flashes and when I depress the clutch it doesn’t engage.
No it’s not showing the red service light and the is no codes. When I cycle the key it does the normal 88 then N. Yesterday once when I cycled the key it went from 88 to 25 then N.
I have the Volvo PTT but I don’t see on there where I can do anything with Eaton unless if it’s an Ishift.

 

Thanks for the help, very much appreciate it! Trying to get service ranger now. Will keep you posted.