I have recently switched my 6.7 over to a 5.9 ecm and harness for competition reasons. The ecm is not loaded with my Vin. The truck won't crank with the key, when I tried loading a new tune file with the correct Vin the v2 told me ignition off. The ignition is indeed on. The issue is this, the ecm isn't communicating on the can line with the truck. Now my question is, will the ecm not having a Vin cause it to not communicate on the can line and be as if the ignition is switched off? I need good solid info on this please...thanks