If you manage more than one Tesla—at home or in a fleet—you don’t need a separate key card for each vehicle. A single Tesla key card can be authorized to work with multiple cars.
This is built into Tesla’s access control system. The card acts as an identifier, and each vehicle decides whether to grant access.
Key Card Versus Phone Key
A phone key is an active smart device. It uses a bi-directional cryptographic handshake over Bluetooth. The phone and car are paired, forming a secure, authenticated bond tied to your Tesla Account on your phone and to the vehicles that have been granted access.
A key card is a passive Near Field Communication (NFC) transponder, similar to a hotel key or access fob. The card does not store data about your car—it does not contain your VIN, settings, or any vehicle information. It holds a single, unique, read-only identifier (UID).
When the card is tapped, the car’s NFC reader briefly powers it, and the card transmits its unchangeable UID. The vehicle’s computer checks that UID against its internal list of authorized keys. If the UID is present, the car unlocks; if not, it remains locked. Because authorization is decided by each vehicle, one card can unlock multiple cars.
How to Add Your Key to Multiple Vehicles
The setup is the same as adding a new key card to a vehicle, repeated for each car you want the card to unlock.
You’ll need the new key card and at least one existing, already-authenticated key for each vehicle (either a phone key or another key card).
In the vehicle, go to Controls > Locks > Keys, then select Add Key. Follow the on-screen prompts to scan the new card. Card placement during authentication may vary slightly by model.
Repeat these steps for every additional vehicle. Afterward, the single card will unlock all of the vehicles you authorized.
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