Deductions & credits

I gave my old biz car to a nephew mid year 2019.  It was not a charitable deduction.  Basically  I just got rid of it.  It had zero value.  I am getting an error saying the depreciation calculation for it is too high.  I don't know where this high depreciation figure is generating from within Turbo tax 2019 (home and Biz).  Please tell me how I can fix this.