Listing is for 1, OEM DODGE RAM CUMMINS Engine Control Unit. (ECU,ECM,PCM,PCU...) P/N: 3946242 Please make sure to match your original P/N when replacing. Do not buy this unit if your P/N does NOT match. This is not simply a used part! It is a remanufactured and tested unit. This ECU has been disassembled, fully inspected all the way down to pcb component level spec testing, reworked and refurbished. It has passed all circuit simulator testing. Its in good working condition. We only use top quality replacement parts in our rebuilds. CORE RETURN: You must send your core to activate your 1 YEAR WARRANTY! Simply pack your old pcm into the packaging provided, attach a shipping label and let us know your core return is heading back to us. We will start your 1 year warranty once its received. I WILL INCLUDE FOR FREE AFTER PURCHASE: Flash updating of the latest Calibrations (ecu programming). VIN programming to match your car. This ECU will be plug and play to your car. Please include your YEAR, VIN TRANSMISSION type in purchase notes or message it to us after purchase. IF you do not provide this information with in 24hrs the pcm will be sent as is and you will need to program it yourself.