2012 Cummins ISB, School Bus, ECMs, Fits to: Freightliner B2, (Used) 2012 Freightliner B2, ENGINE ECM- ESN: 73221132, Engine: P-54201, Serial Number: 29392, Part Number: 4993120, Ecm Code: BZ90023.15, 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# 73221132, Casting# 73221132, Truck Year 2012 4UZABRDU7CCBH0496