Code 1693?
 

hello i was wandering what code this was becuase a couple of days ago we scanned my truck and it poped up four codes and then we erased them and then waited a couple of days and this code poped back up p1693. So i was wandering what code this was if this code comes up should i know if its bad will my truck drive bad?

This is the best I have found:

P1693 - Indicates a fault code has been generated in the companion engine control module.

There is also this:

https://www.dieselbombers.com/24-val...odes-solo.html