2007 volvo with cummins cm870

[Bengy88]

Looks like you may be loosing ecm power, ground, or data link. Or maybe your ecm is taking a shi#t. Start your truck and smack the top of your ecm with a rubber hammer and see if the truck shuts off or stumbles. Then I would check my powers and grounds. There should be a fused power supply in the battery box, sometimes you find an issue between there and the ecm and also check your power and ground studs on the firewall.