The vehicle should be listed in a fixed asset account with an associated accumulated depreciation account. If you have not claimed annual depreciation, then you need to see a tax accountant since the IRS requires that you use that amount that you did not claim to adjust the balance of the fixed asset before you dispose of it.
Calculate and enter partial year depreciation
Create an income account called gain/loss on asset disposition
then it is just journal entries
debit accumulated depreciation, credit car fixed asset for the balance in the depreciation account
debit gain/loss and credit fixed asset for the balance in the fixed asset account
debit the bank for any money received and credit the gain/loss account
