0 GM/Chev (HD) 6.0L, , ECMs, Fits to: , (Used) 2011 GM/Chev (HD) 6.0L, ENGINE ECM- ECM Model: E78, Part Number: 12640466, Serial Number: 86AAUSK010686U74, Serv. Number: 12616532, 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# 86AAUSK010686U74, Casting# 86AAUSK010686U74, Part# 12640466