Eaton Ultrashift Transmission

Hey there fellers. I got a problem that I can’t figure out. I have a 2016 Volvo with a Cummins and a10 speed Eaton Ultrashift Transmission. Lately I’ve been having battery problems and last week the battery died and when I jumped it and got it started I got a service light on the push bottom shifter and on the dash It will switch from F to N for what gear it is showing. I got an active fault code for the transmission that is: SA 3 SPN 520571 FMI 4. Now I’m now sure what to make of this but I simply can’t get it to go into drive or shift gears. Can anyone point me in the right direction. I have to get it towed to a shop which will be costly and then have it diagnosed. At least I can have an understanding of that’s happening before I have to do that. Thanks

 

I had it towed to a shop and they replaced the ECA and I was told problem solved. I drove off the lot and then the problem happened again and I got towed back. I was also told that the alternator is bad, could this cause this problem to reappear or could it be a bad part out of the box or could it be something else all together???