09 prostar with ISX randomly shutting down

[Waterloo]

I had a similar issue with my ABS, Engine Brake and Trailer ABS idiot lights going nuts on the dash, 2008 ProStar... It was the compass control module. The compass, E, N, S, W... Bus system can be buggy as hell on these trucks. I replaced that module and the problem went away. The only reason I found this, was to take the truck to International and have them run their International diagnostics on the cab. Took two minutes to figure it out at that point.

I would take it somewhere that has the Diamond Logic software and run a diagnostics. More than likely it will immediately tell you what is bad.