(Used) 2009 GM 4.8L, ENGINE ECM- Serial Number: 86AAKAK2017481WE, Part Number: 12635858, Service Number: 12633238 Displacement: 4.8L, Horsepower: 295, Engine: P-40389 Truck: 512550 For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921