Deductions & credits

@jan1666 are you an employee or self-employed? You mention TurboTax Home & Business CD/Download so I assume you are using the desktop version.

Self-employed

If you are self-employed:

1. Select the Business tab
2. UPDATE Profit or Loss from Business
3. EDIT (Your Business name)
4. Find Business Vehicle Expenses and UPDATE
5. EDIT (Your Vehicle) in Vehicle Summary
6. Clear the box “Tell us when you sold, traded-in, gave away or stopped using your (Vehicle) for business in 2020"
7. Uncheck “I stopped using this vehicle in 2020”

Employee

If you are claiming job-related expenses:

1. Select the Personal tab
2. Choose Deductions & Credits
3. Find Employment Expenses > Job-Related Expenses and UPDATE
4. EDIT (Your Occupation)
5. Continue to the Vehicle Summary
6. EDIT (Your Vehicle)
7. Clear the box “Tell us when you sold, traded-in, gave away or stopped using your (Vehicle) for business in 2020"
8. Uncheck “I stopped using this vehicle in 2020”