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2000 5.9 24 valve Cummins PCM won’t let truck run


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I’ve been trying to figure this out for a couple days now. I’m having troubles with truck running when pcm is plugged in. If I unplug C1 It will start.  If I unplug C3 it will start but say I have C1 plugged in and plug C3 in kills it immediately. Same if it’s other way around. Could this be due to security? 
 

Please help 

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Obd2 reader if I plug everything in it will read codes because I unplugged everything but you reset them and it still won’t start and no they don’t come back. Did key trick first thing before messing with it and it said p done. 

The smaller wiring harness there on drivers side fire wall must go to something that is the culprit. 

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This is a long shot but I have heard here in the past of whacked oil pressure sensors causing trouble in other sensors. Might try just unplugging it and see what happens. Just spit balling here since I dont remeber the issues folks were going thru. I do remember they had no codes for it either.

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Somewhere on this forum in the last couple of years, I remember seeing the identical issue in a post. I don't remember seeing the solution but keep searching and you should be able to find it. 

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