2020 Tesla Model Y Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I frequently get questions about modern EV key systems. The 2020 Tesla Model Y represents a massive shift from traditional transponder keys. Out of the factory, the Model Y primarily relies on your smartphone (Phone Key) and a credit-card-sized NFC Key Card. However, Tesla does offer a physical Key Fob—shaped like a miniature Model Y—that utilizes Bluetooth Low Energy (BLE) and NFC to lock, unlock, and drive the vehicle.

Fortunately, Tesla's system is incredibly user-friendly when it comes to adding new keys, provided you already have at least one working key card or fob.

Quick reference

Step-by-step on-board programming

The 2020 Tesla Model Y allows you to program a new key fob entirely on your own without any specialized scan tools or a trip to the dealership. Note: You must have at least one already-programmed, working Key Card or Key Fob to authorize the pairing of a new one.

1. Sit in the driver's seat of your Model Y with your new (unprogrammed) key fob and your existing (programmed) key card or fob.
2. Tap the Car icon on the bottom left of the touchscreen to open the main Controls menu.
3. Select "Locks" from the left-hand menu.
4. Tap the "+" icon next to the "Keys" section to add a new key.
5. Scan the new key fob: Place your new key fob on the center console, specifically right behind the cup holders (this is where the vehicle's NFC reader is located).
6. Authenticate with your working key: The touchscreen will prompt you to tap an existing, authenticated key card or fob to approve the pairing. Place your existing working key in the same spot behind the cup holders.
7. Confirm pairing: The screen will show that the new key has been successfully added. You can now tap the pencil icon next to the new key on the screen to rename it (e.g., "Wife's Fob" or "Spare Fob").

Battery replacement

If your key fob is struggling to connect, the CR2032 battery is likely weak. Replacing it is a quick DIY task:

1. Place the key fob upside down on a soft surface.
2. Look for the small notch at the rear of the fob (where the trunk would be).
3. Use a small flathead screwdriver or your fingernail to pry up the bottom cover.
4. Remove the old battery and insert a fresh CR2032 battery with the "+" side facing up.
5. Snap the bottom cover back into place. No reprogramming is needed after a battery swap.

Where to buy a replacement fob

When it comes to purchasing a replacement key fob for a 2020 Tesla Model Y, your options are a bit different than traditional vehicles:

• Tesla Shop (Direct from Manufacturer): This is the best and most reliable option. A brand new key fob directly from the Tesla app or website typically costs around $175. It guarantees you are getting the correct BLE/NFC hardware.
• Automotive Locksmiths: Many modern locksmiths stock OEM Tesla key cards, but fewer stock the physical fobs due to lower demand. Expect to pay a small premium for the convenience of mobile delivery.
• Amazon / eBay: While you will see dozens of listings, the vast majority are just silicone covers or empty replacement shells. Any used electronic fob carries the risk of being damaged, and there are virtually no functional aftermarket electronics for Tesla fobs. Stick to OEM.

If on-board programming isn't supported

On-board programming is supported for the 2020 Model Y—as long as you have a working key. But what happens if you lose every single key card, fob, and phone connection to your vehicle?

In an "All Keys Lost" scenario, you cannot authorize a new key yourself. The vehicle's immobilizer system is locked down to prevent theft. You will have to rely on Tesla Mobile Service or a highly specialized automotive locksmith equipped with Tesla-specific diagnostic software (like the Tesla Toolbox). They will have to wipe the existing key data and securely pair new keys to the vehicle's body control module. Expect an "All Keys Lost" situation to cost anywhere from $250 to $500 depending on your location and whether a mobile tech comes to you.

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