Okay, from your question, it sounded like you were trying to recapture depreciation. But, since you never took any there is nothing to recapture and it doesn't make any difference if you used your vehicle less than 50% for business. You still get to take the standard mileage expense deduction. You don't need to be in the asset/depreciation section at all, and you can delete that record.
You can go to the Business Vehicle Expense under Business Expenses and go through interview and see what your deduction is at the end. When you are adding your information about your vehicle you will see a box with the statement "I stopped using this vehicle in 2017." If you used your vehicle through the end of the year, then don't check it.
