2013 CM2250 cranks over no start J1939 failure

[APC]

It sounds like you may have a short on your J1939 datalink wires. the steps i would take to troubleshoot this situation is to use a Nexiq USB Link 2/3 to connect to the truck with your laptop, and use nexiq's device tester app in order to determine what protocol is damaged/disturbed. dont quote me on this, but for a 2013 pete 386 there should only be J1708 and J1939:Channel1... no other datalinks in that truck as far as my knowledge...

once you figure out which datalink is disturbed, then you can try to troubleshoot the problem by measuring your voltage on the datalink wires in your diagnostic plug on the truck... look up a pinout for deustch 9 pin for J1939, and the 2 1939 datalink wires should be somewhere in the area of 2.3-2.8 Volts on each wire of the paired datalink wires (CAN High and Low)...

based on what you see, you can try to either trace wires to find a short/open circuit, or disconnect the modules one by one to see if one of the modules went bad and are disturbing the J1939/1708...

another thing worth mentioning, is that a missing/damaged terminating resistor can cause the same issue...

cant guarantee these steps will 100% fix your issues, but these are worth checking to try and guide yourself in the right situation