Paccar MX-13 ECM ECU Diesel Engine Computer - 2109555 EPA13 2012 Tested. Unit pictured is the unit you will receive.See pics in gallery - Test and Inspected. Please verify fitment prior to purchasing. This ECM will need to be flashed/programmed to your vehicle which is your responsibility. 1877245,2298831, 2013285, 2109555, 1833060, 1889041, 1952840.