You may have fully depreciated the vehicle in the year you purchased it, by choosing the bonus depreciation or section 179 depreciation option for the vehicle. If so, then the basis of it would be zero, so you would have no gain or loss on it's disposition.
If not, then something may be wrong with the basis of the vehicle reported in TurboTax. I suggest you look at the asset entry screen for the vehicle, which you can do in the Forms Mode (see the Forms icon or use View and then Go To Forms.) Look for the Asset Entry Wks.
On the asset entry worksheet, you will see the cost of the vehicle, prior depreciation and the current year depreciation deduction. The difference between the cost and depreciation taken will be your basis which should equal the loss you sustained.
You also have to be carful to indicate the proper business use percentage of the vehicle, as you can only deduct a loss on the business use portion of the vehicle.
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