complete check indicates I need to adjust the car and truck expense worksheet but no field is editable. How do I do that?

You can get back to the screens used to enter your car and truck expenses to make any necessary corrections by using the instructions below:

 

1. Click on the search bar on the top right of your TurboTax screen
2. Type "sch c" in the search box.
3. Click on the link "Jump to sch c"
4. Click "edit" next to your business 
5. Scroll down to "vehicle expenses"
6. Make your necessary changes to your vehicle expense per the "Check entry"

 

Click here for "Business Use of Vehicles"

 

Click here for "Driving Down Taxes: Auto-Related Tax Deductions"

Click here for  "Maximizing Tax Deductions for the Business Use of Your Car"