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  1. 4th Gen Performance Parts Discussion
    I have a 2015 Ram 3500 with a Cummins 6.7 diesel engine. I deleted it and installed MM3 and a Fish CSP5 switch. The technician flashed the ECM and the truck accepted the tunes. After flashing the ECM the CEL was on. A search revealed an error code of U0101 indicating a loss of communication with...