(Used) 2011 GM/Chev (HD) 4.8, ENGINE ECM - Part Number: 12635858, Serial Number: 86AAKAK201535BE0, Service Number: 12633238, Family Number: BGMXE04.8581, Displacement: 4.8L, Horsepower: 285, Engine: P-52023, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921