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Thread: L5P u0100 No Crank ECU fail?

  1. #1
    Potential Tuner
    Join Date
    Jul 2021

    L5P u0100 No Crank ECU fail?

    2018 L5P tuned and deleted. Truck has been this way for almost a year, but I stopped to get diesel and the truck had 0 issues. All of a sudden the truck wouldn?t start, the whole dash and everything came on but when I turn the key, nothing. All of the driving helps are flashing because they?re off. U0100 code, communication error. Has anyone had this issue? I hope the ECU isn?t bricked

  2. #2
    Advanced Tuner
    Join Date
    Aug 2016
    U0100 means lost communication with ECM, so, yeah, it sounds like it's toast.