2012 GM/Chev (HD) 6.0L, Truck Delivery, ECMs, Fits to: Workhorse Custom Chassis W62, (Used) 2012 GM/Chev (HD) 6.0L, ENGINE ECM- ECM Model: E78, Part Number: 12649297, Serial Number: 86AA7GK02164QSL2, Serv. Number: 12643636, Engine Information- Fuel: Gasoline, Stock #P-63248, 1 Rectangular Plug with 55 Pins, 1 Rectangular Plug with 73 Pins, 1 Rectangular Plug with 65 Pins, Reference images for condition. For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY, ELKTON, MD 21921, Serial# 86AA7GK02164QSL2, Casting# 86AA7GK02164QSL2, Truck Year 2012 5B4MFG2E5C3450091