Up for sale is a(n). OEM 2007 Cummins Dodge Ram 2500 Engine Computer. 6.7L Diesel Only Automatic Transmission 4×4. Engine Control Module (ECM). OEM #s: 3963994, P3963994. PLEASE NOTE: THESE UNITS ARE BOUGHT BY PART NUMBER ONLY. THIS UNIT MAY REQUIRE REPROGRAMMING TO BE OPERATIONAL (USUALLY LATE MODEL VEHICLES) REPROGRAMMING MUST BE DONE BY THE DEALERSHIP OR A QUALIFYING LICENSED MECHANIC. 2007 DODGE RAM 2500 6.7L Diesel 4×4. This part should fit the following vehicles. 2007 Dodge Ram 2500 & 3500 6.7L Diesel. This is a used part and not in brand new condition. Normal road wear and few minor scratches can be expected. What you see in the pictures is exactly what you get, unless mentioned otherwise in the description. All items are marked for security purposes.