2020 Tesla Model S Key Fob Programming Guide

Welcome to the complete key fob programming and replacement guide for the 2020 Tesla Model S. As an ASE-certified electrical technician and automotive locksmith, I frequently get questions about Tesla keys. Unlike traditional vehicles that use mechanical blades and standard immobilizer chips, the 2020 Model S utilizes a highly advanced Bluetooth Low Energy (BLE) and RFID system. Fortunately, Tesla designed this system to be incredibly user-friendly when it comes to adding new keys, saving you a trip to the dealership—as long as you still have one working key.

Here is everything you need to know about replacing, programming, and maintaining your 2020 Tesla Model S key fob.

Quick reference

Step-by-step on-board programming

One of the best features of the 2020 Model S is that you can pair a new key fob, key card, or phone key directly through the vehicle's center screen (MCU). Note: To do this yourself, you must have an existing, paired key card or key fob on hand to authenticate the process.

Follow these steps to program your new fob:

1. Enter the Vehicle: Sit in the driver's seat with both your new, unprogrammed key fob and your existing, paired key card or fob.
2. Access the Locks Menu: On the center touchscreen, navigate to Controls (the car icon) > Locks.
3. Initiate Pairing: In the "Keys" section on the screen, tap the + (Add Key) icon.
4. Scan the New Fob: The screen will prompt you to scan the new key. Place the new key fob on the center console's designated RFID reader area (usually right behind the cup holders on the center console, or in the phone charger tray area, depending on your exact interior build).
5. Authenticate: Once the vehicle recognizes the new key, the touchscreen will prompt you to authenticate the process. Place your already-paired key card or key fob on the same center console reader to prove you are the authorized owner.
6. Confirm and Rename: Upon successful authentication, the new key fob will appear in your list of active keys. You can tap the pencil icon next to it to rename it (e.g., "Wife's Fob" or "Spare Key").

Battery replacement

The 2020 Tesla Model S fob uses a standard CR2032 3-volt lithium coin battery. You will know it's time to replace it when the vehicle displays a "Key Battery Low" warning on the dash, or if the passive entry system stops responding from a distance.

1. Place the key fob upside down on a soft surface.
2. Using a small flathead screwdriver, a spudger, or a strong fingernail, gently pry off the bottom battery cover.
3. Remove the old CR2032 battery.
4. Insert the new CR2032 battery with the "+" (positive) side facing outward toward the cover.
5. Snap the battery cover back into place. Test the fob to ensure the buttons and passive entry work.

Where to buy a replacement fob

When it comes to sourcing a new key for your Tesla, you have a few avenues, but one stands out as the clear winner.

• Tesla App / Service Center: This is the best route. You can order an OEM fob directly through the Tesla app or online shop for around $175 to $200. It guarantees you are getting the correct FCC ID and a brand-new, unassigned key.
• Automotive Locksmith: While many locksmiths handle traditional cars, not all carry Tesla fobs in stock. However, a specialized modern locksmith can source the key and help you if you are in a pinch. Expect to pay a markup, often around $250+.
• Amazon / eBay: You can find used Tesla fobs online for around $100. Proceed with caution. Some used fobs can be stubborn to re-pair or may be internally damaged. Sticking to OEM directly from Tesla is highly recommended for reliability.

If on-board programming isn't supported

What happens if you lose all of your keys (phones, cards, and fobs)? If you are in an "all keys lost" scenario, the DIY on-board programming method will not work because you have no way to authenticate the new key in Step 5.

In this case, the vehicle's security immobilizer will lock you out of the programming menu. You will need to contact Tesla Mobile Service or a specialized automotive locksmith equipped with Tesla's diagnostic software (Toolbox 3). They will have to securely access the vehicle's computer via a laptop to bypass the missing authentication and force-pair a new key. This service will run you anywhere from $250 to $450, depending on distance and mobile service fees.

Find a mobile locksmith or shop on Repairius.