(Used) GM/Chev (HD) 8.1L, ENGINE PCM- Part Number: 12597116, Extension: 86YKYW926209J1RX, Serial Number: 12589161, Serv. Number: 12602801, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921