06 MXS Cat C-15 Injector / electrical issues have us stumped

Msx 06 model platinum overhauel code 72 low current injector 1 replace inner harness for injectors and ivas worked 3 months started again replace ecm fixed several months started again code 72 replace outer harness on ecm to injector harness lasted 10 hours code 72 all batteries new ground wires cleaned and checked no rubbing

 

Code 72 can be injector 1 or 2. If you get it on a laptop it will narrow it down to a cylinder. Best ohm out the harness and tug test the wires at the plugs.

 

I’m having issues w my injector as well except mine is acting differently. Injector 5 was replaced last year due to it showing as dead so I replaced it then after some time it started acting up w similar problems same injector as well. We did cylinder cut out test and showed it didn’t make a difference w fuel delivery. Solenoid test showed it was good as well, replaced injector harness inside valve cover same thing again. I’m co fused myself right now. Anyone else can lead me in the right direction thx

 

Did anyone ever figure this out? I’m having the same problem. All harnesses internal and external have been replaced and now the truck is back in the shop having the 4th internal harness replaced. Also replaced the ecm. Batteries and cables are good. Any help would be much appreciated