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Tesla Phone Key and Key Card: Set Up a Backup Way In

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Set up at least two independent ways into your Tesla before you need them: the phone key plus a key card kept somewhere other than your phone. If your phone is flat, lost or left behind, the card is the way in. Test each method while you are standing at the car with nothing at stake.

Why one way in is not enough

A phone fails in ordinary ways: the battery dies, it is left at home or it is lost. If it is your only key, the car fails with it. Which keys your car supports (phone key, key card, key fob) and how they work differ by model and software version, and menu names move between releases, so confirm the steps in your owner’s manual.

Build the set in priority order

Action
Add a key card from the Keys or Locks screen on the touchscreen (look under Controls Locks or the path your manual gives).
Why it helps
A card needs no battery and no phone. It is the most dependable fallback you can carry.
Verification
The card appears in the car's list of keys, and it unlocks the car when tapped on the reader the manual describes.
Action
Store the card away from the phone, for example in a wallet, not the glovebox.
Why it helps
A card inside the locked car does not help. A card in the same pocket as the phone is lost with it.
Verification
You can state where the card is right now without looking.
Action
Add a second phone key for any other regular driver, using their own phone and the Tesla app.
Why it helps
Each person has their own access, so you can remove one without affecting the others.
Verification
Each driver's phone appears in the key list and unlocks the car on its own.
Action
Test each key at the car, then again after the next software update.
Why it helps
An untested backup is only a hope. Updates are the usual reason a setting changes.
Verification
Every key locks and unlocks the car. Note any that do not and re-add them.

If your phone is flat or missing

  1. Use the key card: tap it on the reader as the manual shows, then follow the on-screen prompt to be ready to drive.
  2. Use a second phone key if someone else with access is nearby.
  3. If you have no key, look in the owner’s manual and on Tesla Support for the process on your model. Do not assume it will be quick.

Lost phone or card

Remove the lost key from the car’s key list as soon as you can, from inside the car using a working key. That stops it from working. Then consider adding PIN to Drive, so a stolen key alone is not enough to drive away.

Profile B If you park in shared lots or on the street, keep the card on your person every day and consider PIN to Drive. Profile C On a trip, carry the card in a different bag from the phone and the charger cable.

A note on the 12V battery

If the car does not respond to any key, the low-voltage battery is a possible cause. See the emergency kit and 12V guide and your manual’s section on opening the doors with the manual release.

How it works

A phone key works by the phone talking to the car over a short-range wireless link, usually Bluetooth, through the Tesla app. The car detects the phone as you approach and can unlock or let you drive. This convenience depends on the phone being on, charged, holding the app and allowed to communicate.

A key card works differently: it is a passive card that the car reads at close range when you tap it on the reader. It contains no battery. That is why it is the right backup for the main failure of the phone key, which is the phone itself.

Each key is registered with the car. You approve a new key using one that already works, which stops a stranger adding one. The same list lets you remove a key you no longer trust. Keeping the list small and known means you can reason about who has access.

The design question for you is independence. Two phone keys that both depend on the same phone or the same pocket are not independent. A phone key plus a separately stored card is.

Worked example

Suppose a household has three regular drivers: two adults and a teenager, each with a phone. They add one key card.

Count of independent ways in: 3 phone keys plus 1 card is 4 keys in total, but the useful number is how many failure types are covered. Phone flat or lost is covered by the card. The card lost is covered by the phones. If one adult loses a phone, the other two phones and the card still work, and the lost one is removed from the key list.

The check that makes this real: on a Saturday, each of the three drivers locks and unlocks the car with their phone while standing next to it, and the card is tapped once. That is four tests, perhaps five minutes. The verification is a written line: “all four keys tested, card is in the wallet.” Repeat after the next update.

Names and counts here are hypothetical. The number of keys a car can hold is not stated here; check your manual.

Frequently asked questions

What if my phone dies and I cannot unlock my Tesla?

Use the key card, tapped on the reader your manual describes, or a second phone key. Setting up the card in advance is the whole point of this guide.

Do I need a key card if I have a phone key?

A card is a battery-free backup for the main failure of a phone key, which is the phone. Many owners add one and keep it in a wallet rather than in the car.

How do I remove a lost phone or key card?

Open the key list on the car's touchscreen from inside the car, using a key that still works, and delete the lost key. The exact menu name varies by model and software version.

Can I give someone else access to my Tesla?

Yes, other drivers can add their own phone key. Add them only for people you trust, and remove them when access should end.

Does a phone key work if the phone has no signal?

The link to the car is short range rather than a mobile data connection, but behaviour varies by model and software. Test it in a low-signal place and read your owner's manual.