2018 Tesla Model S Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Good news! Programming a new key fob for your 2018 Tesla Model S is a straightforward process that you can do yourself right from the vehicle's touchscreen. There's no need for special tools or a trip to the dealership for this procedure.

1. Enter the vehicle: Get into your Tesla Model S and ensure all doors are closed.
2. Access the touchscreen menu: On the main touchscreen display, tap on Controls > Locks > Keys.
3. Initiate programming: Tap the + icon to add a new key.
4. Place the new key fob: The screen will instruct you to place the new key fob on the designated area. This is typically in the center console's cup holder area, but the screen will show you the precise location.
5. Scan an existing key fob (if prompted): If you are adding a new key and still have a working key, the car may prompt you to scan an existing, already programmed key fob on the same designated area.
6. Confirmation: Once the new key fob is successfully programmed, you will receive a confirmation message on the touchscreen. Test the new key fob to ensure it locks, unlocks, and starts the vehicle.

Important Note: You will need at least one previously programmed and working key fob present in the vehicle to add a new key through the touchscreen. If you have lost all your keys, you will need to contact Tesla Service for assistance.

Battery replacement

The key fob for your 2018 Tesla Model S uses a single CR2032 coin cell battery. When the battery is low, you might notice reduced range or intermittent functionality. Replacing it is simple:

1. Remove the bottom cover: On the underside of the key fob, locate the small seam. Gently pry open the bottom cover, perhaps using a small flathead screwdriver or a plastic trim removal tool to avoid scratching.
2. Remove the old battery: The CR2032 battery is usually visible once the cover is off. Note its orientation (positive side up) and carefully pry it out.
3. Insert the new battery: Place the new CR2032 battery into the compartment, ensuring the positive (+) side is facing up, just like the old one.
4. Replace the cover: Align the bottom cover and press it firmly back into place until it clicks securely.

Where to buy a replacement fob

When it comes to replacing a 2018 Tesla Model S key fob, your options are a bit more streamlined than with traditional vehicles.

• Tesla Service Center: This is the most reliable option for purchasing an OEM replacement. You'll get a genuine Tesla part guaranteed to work. The downside is the cost, which can range from $150 to $350 for the fob itself, plus any potential service fees if you don't have a working key to perform the DIY programming.
• Online Retailers (Amazon, eBay, etc.): While you might find "OEM" key fobs on these platforms, exercise caution. Ensure the seller is reputable and that the FCC ID and part number match exactly. Be wary of significantly low prices, as these might indicate aftermarket replicas that may not function correctly. Costs can range from $100 to $250, but authenticity can be a gamble.
• Locksmiths: A traditional locksmith might not stock Tesla key fobs due to their unique nature and Tesla's proprietary systems. However, a specialized automotive locksmith familiar with Tesla vehicles might be able to source and program a replacement, often at a slightly lower cost than the dealer if they can bypass the need for a working key (though this is less common with Teslas).

If on-board programming isn't supported

For the 2018 Tesla Model S, on-board programming is supported as long as you have at least one working key. If you've lost all your keys, the situation changes. In this scenario:

• Tesla Service Center: This will be your primary (and likely only) option. They have the specialized diagnostic tools and software to program new keys when no working key is present. Expect costs to be higher, potentially ranging from $250 to $500 or more, which includes the new key fob and labor. They will also need to verify your ownership of the vehicle.
• Immobilizer Transponder: Tesla vehicles utilize a sophisticated immobilizer system tied directly to their vehicle's security protocols. The key fob itself contains the necessary transponder data. When you program a key via the touchscreen, you are essentially enrolling that key's unique identifier with the car's immobilizer system. If all keys are lost, the entire system might need a reset or re-enrollment, which only Tesla can perform.

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