(Used) 2009 GM/Chev (HD) 6.0L ECM- Part Number:12635858, Serial Number: 86AAKAK201052C4K, Serv: 12633238, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921