If you had 50% personal use, that would cut the basis of the vehicle in half, so your cost of $16,733 gets reduced, so your basis that I calculated as $11,755 would be less than that. The smaller your basis, the more chance of you having income on the disposal.
Looking at it from the big picture, you purchased an auto and deducted the cost of it from business income for a couple of years. Now you trade it in on a new car, so if you get more for it than the cost less depreciation (the basis), you have a taxable gain. The gain will be the cost of the new car, less what you paid for it with cash, less the basis of the car you traded in. If you get more for the trade-in than your basis, you have a taxable gain.
I don't know exactly what entries you made in TurboTax, so I can't be more specific.
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