Hi, Erick. You can't deactivate a vehicle set as primary. To make it inactive, you'll have to assign a different primary vehicle first.
To do this, go to the Miles menu, click the Manage vehicles from the Dropdown next to Add trip. Select the vehicle you want to set as the primary, then toggle the Set as Primary Vehicle switch.
After saving, you'll be directed back to the Manage vehicles section. From there, select the vehicle you want to deactivate, and click the Vehicle no longer in use option.
Please note that the following steps are intended for web browser users. If you're using the mobile app, follow the instructions in the Manage your vehicles section of this article: Set Up Vehicles and Mileage Tracking.
If you have any other questions, please don't hesitate to reply below. We're here to help.