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Hello, if the truck is going into a fail safe mode it will set a diagnostic trouble code. Some Ford trouble codes are proprietary, meaning they can only be read by a dealer style or very high end scan tool. If you are using a generic code reader, it may not be able to read the trouble codes stored. If you can get it scanned by a dealer or shop with a good scan tool, it should tell you more. Once you know why it is going into fail safe you will have a better idea of what area to test or inspect.