07 Volvo VNL no crank after battery change

That sounds like you could have connected a wire in the wrong place?
Some of those had a solenoid between the ignition switch and the starter solenoid. They were on the left side of the engine plugged into a harness plug. Not nearly as large as I would expect and a common fail item.

 

Your having the same trouble as am. Ive had a mechanic tell me its probably a software issue and will have to go to the dealership to get the software reloaded or updated. SInce you just changed out the batteries, make sure that both fuses are connected to positive terminal and the grounds are also connected. Make sure the fuses are good. I put new batteries in mine as well. No power to the shift controller, cant pull up transmission controls, says communication failure. Ive checked all the relays and fuses. I asked about this sometime back on this forum, maybe some new answers by now. If I dont find anything soon, Im going to have to take to the dealership.

 

Troubleshooting SID 231 FMI 9 Fault Code on J1939 Data | JustAnswer
SID 231 Transmission Code and ECU TCU Communication Fault

 

Do you have a battery turn off switch? If so this might be the problem. I had a 2014 that had to be replaced and would not start the truck.

 

www.eaton.com/content/dam/eaton/products/transmissions/vehicle-transmissions/troubleshooting-guides/eaton-gen-2-automated-transmissions-troubleshooting-guide-trts-0062-en-us.pdf

Here is the Eaton troubleshooting guide. It has a section where you check the voltage on the transmission controller and much more. Hopefully it tells you what you want to know voltage wise. I have not had the opportunity to do any troubleshooting on mine just yet.