Engine Synchronization?

[JimT]

Without knowing what ELD you use, what capabilities it has (beyond just the basic logging requirements) or any info about your truck and engine, it's hard to know where to start.

So, knowing nothing at this point, my first question would be are you sure that notification was a fault related to the engine itself or could it have been a problem with data synchronization between the ELD and the ECM? If the latter then it could just be as simple as a loose connection to the ELD or some other wiring issue or a problem with the ELD's hardware or, well, pretty much anything electrical.