In order to claim vehicle expenses for your business, you must enter both the total km driven in the year and the total km driven for business in order to calculate the deduction.
If your business summary shows $0.00, the most common reasons are a) your business had a loss last year or b) the business period has not been completed. In the opening screens of the business/self-employment section, you must record the start and end date of your business year. Return to the opening section of the business interview and ensure these dates have been entered properly.