Each FICM is remanufactured by ALLIANT POWER, bench tested to ensure units are programmed to match each specific Navistar reference number and tested to ensure desired performance.It is imperative to verify the ECM reference number prior to ordering. Choosing the wrong part could cause catastrophic engine failure. For proper FICM selection you must verify the ECM calibration reference number. The ECM reference number is under the Vehicle Information tab, using the ServiceMaxx scan tool.All FICMs are backed by ALLIANT POWERs 24-month, unlimited mileage warranty, as well as ALLIANT POWERs best in class technical support.