I have J.D 748G 3 skidder that through two fault codes F475 which is a debated engine. But I can't find what F477 is for can somebody please help me out??? Thanks
477 is a security code. The wrong ecu has been installed on the engine, or replacement monitor that is not recognized by the ecu. John deere or john deere programming is likely your only option. My experience with this issue involved replacing the ecu and the dash monitor and programmed to recognize each other as valid.