If you had a gain on the disposition of the vehicle, you would report that as an investment sale. Otherwise, you would not need to report it as you can't deduct a loss on the disposition of personal property.
You enter investment sales in the Wages and Income section of TurboTax, then Investment Income, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc... Skip the section where it asks if you want to upload your tax documents. Choose Other as the type of investment you want to enter. You'll come to a screen where you can enter in your sales proceeds and cost basis.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"