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regardless of where you get an ecm it's going to need to be reflashed. Only some one with cat e-t can do that, my suggestion would be to find someone in your area they can get an image off of, than it can be transferred to your new or refurbished ecm. The cat shop isn't cheap but the cummins or...

I suspect no power to the ecm, cat ecm's are pretty robust, aside from too much voltage or reverse polarity it should be good. The no communication error most likely is because the ecm isn't powering up. We did have one in Iraq with that same problem and s&s replaced an engine under warranty...