2012 Freightliner Cascadia randomly shuts off in neutral

i had that turning on and off issue while driving on my 2012. i replaced the black fuse box on the firewall. pndb box

 

I had the issue with my pndb box it didnt give me any code but it would randomly turn off while running and start right away

 

We had issues on our 2011 & 2012 Coronado SD’s (DD15) with the rectangular fuse/relay box mounted beside the steering column. We never replaced them so I couldn’t tell you if it’s the same box as above. There are very large spade connectors inside that box, under the fuse blocks. They’re not beefy enough in the early years and would lose connection from the main relays. As soon as you pop the fuse/relay blocks out of the lower box, the spades will disconnect and they shouldn’t.

You might be able to get by if you get to them and “give them a tweak” and put them back together. We always had to replace the spades with the heavier duty version.