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Cummins ISX EGR ECM ECU Engine Computer Module 3684009 CM870 CPL 8520 Tested
OEM Cummins ISX EGR ECM ECU 450HP P/N: 3684009 CM870 ESN: 14045162 CPL8520 Tested. Used Takeoff Unit - Carefully Removed From Running Salvage Vehicle. Bench tested to verify condition. Unit Pictured is the one you will receive.