2009 Mack GU713 dying out and ABS light on showing no communication

Have a 2009 Mack GU with intermittent loss of power. It will drive fine all day sometimes but other times it will randomly die. When it shuts off there is always an ABS light that reads "communication with engine lost." After it dies, you have to cycle the key until the ABS light goes away or it will not start or even crank. You can jump the starter so it will crank but it still won't start. We have spent hours testing wires, relays, solenoids, fuses, literally everything it could possibly be and we are at a loss. Has anyone experienced/found a solution for this problem?

Mack dealership said to change ECM, we changed it and it didn't fix the problem.

 

Yes, the only code showing up is ABS "communication with engine lost" otherwise, there is zero codes active or inactive in the system.