"Schedule C- Date sold must be entered". I didn't sell vehicle

You may need to delete and re-enter your vehicle information.  

To get to the screen and enter this in TurboTax Online you can follow these steps:

1. Within your return use the magnifying glass to search schedule c and click the Jump to link
2. Click Review or Edit for the line of business with the miles you need to change
3. Click Edit next to Vehicle under Expenses
4. Click the trash can icon on the Vehicle Summary screen to delete the vehicle and Confirm
5. Click Start next to Vehicle under Expenses
6. Continue and answer questions for the vehicle until you get back to the Here's your XXX info screen
7. Proceed entering/reviewing your return

To get to the screen to enter this in TurboTax Home & Business you can follow these steps:

1. Within your tax return click on the  Business tab and Business Income and Expenses under that
2. Select I'll choose what I work on
3. Click Update for Profit or Loss from Business
4. Click Edit on the line of work you want to update
5. Scroll down to Business Vehicle Expense and click Update
6. Click the trash can icon on the Vehicle Summary screen to delete the vehicle and Confirm
7. Scroll down to Business Vehicle Expense and click Start
8. Continue and answer questions for the vehicle until you get back to the Vehicle Summary screen
9. Click Done and proceed entering/reviewing your return

@lboogie12