Traded in car used part-time for business - think I entered the information wrong - HELP!

I am self-employed and occasionally use my car for business.  It is my only car so I do deduct the standard miles for my business.  The percentage use for my business is very low (!.5% - 4.5% on average across the years I owed my car).  I recently traded in my car to buy a new one so I wanted to take it out of service for the business and add my new one on.  I was very confused by the information it was asking and don't think I entered things properly because TurboTax is now assigning the full trade-in value of the car to "sale of business asset" which doesn't seem right when I only used the car sparingly for business.  Any idea where I went wrong and how to guide me to correct it?