mooniey

Hello new here, I work at a truck shop here in maryland, we work on pretty much anything and everything. Were starting to see some newer macks haven't seen any in a while. The issue is with an 04 ch613 customer keeps having issues with the engine position sensor, and setting codes for cylinder 13,and 14, witch it doesn't have of course. Has anyone had this problem and if so where should I look to try to resolve it and how? Any help would be greatly appreciated. Thanks