2017-2024 Tesla Model 3 & Model Y Key Fob: Compatibility, Programming, and Replacement Guide
This guide covers the crucial differences between key fobs, especially for the 2024 'Highland' Model 3, and shows you how to program a new or used one yourself.
- The key fob for the 2024+ 'Highland' Model 3 (part 1819445-00-B) is NOT compatible with older 2017-2023 Model 3s or any Model Y.
- You can easily program a new or used key fob yourself in minutes using the car's touchscreen, as long as you have another working key (card or phone) to authorize it.
- Nearly all key fob 'failure' symptoms are caused by a dead CR2032 battery, which is a simple and inexpensive DIY replacement.
- A used OEM key fob is a cost-effective option, as they are not permanently locked to a single vehicle and can be re-paired to a new car.
Key Fob Compatibility: Model 3, Model Y, and the 'Highland' Refresh
Understanding which key fob works with your specific Tesla is the most important step for any buyer. There is a significant compatibility split with the introduction of the refreshed 2024 Model 3, known as the 'Highland' model.
2017-2023 Model 3 & 2020-2024 Model Y
These vehicles use the original, car-shaped key fob. The most common OEM part number for this fob is 1133148. This fob is designed to work across this generation of Model 3 and all current Model Y vehicles, as they share the same electronic platform.
2024+ Tesla Model 3 'Highland'
The refreshed 2024 'Highland' Model 3 uses a different key fob system and is NOT compatible with the older fobs. The correct OEM part number for the Highland key fob is 1819445-00-B. While some online sellers incorrectly list this part as compatible with all 2017+ models, this is not accurate. To ensure proper function, you must use the fob that matches your vehicle's generation.
Warning: The key fob for the pre-refresh (2017-2023) Model 3 and the key fob for the 'Highland' (2024+) Model 3 are not interchangeable. Buying the wrong part number for your vehicle will result in a fob that will not pair or function correctly. Always verify the part number before purchasing.
Symptoms of a Failing Key Fob
Most key fob 'failures' are related to simple, fixable issues rather than a complete electronic failure of the unit itself.
- Vehicle Does Not Detect Fob: You may have to pull the door handle multiple times, or the car may not unlock on approach (passive entry failure). This is often the first sign of a weak battery.
- Intermittent or Delayed Button Response: Pressing the buttons to lock, unlock, or open the trunks may work inconsistently or with a noticeable delay.
- Reduced Range: You may find you need to be much closer to the vehicle than usual for the fob to work.
- 'Key Fob Battery Low' Message: The vehicle's touchscreen will display a warning when it detects the fob's battery is nearing the end of its life.
- Complete Failure: The fob does not work at all. This is almost always due to a dead battery.
Pro Tip: Before assuming the fob is broken, always replace the battery. The key fob uses a single, common CR2032 battery. This simple step resolves over 90% of all key fob issues.
🎬 Watch: How to troubleshoot and fix a failing key fobKnown Issues, TSBs, and Recalls
As of mid-2024, there are no major recalls or Technical Service Bulletins (TSBs) from the NHTSA specifically for the key fob transmitter itself. Most owner-reported issues are related to software glitches that can affect keyless entry performance for both the phone key and the fob. These are typically resolved with over-the-air (OTA) software updates from Tesla. In some rare cases, external devices like high-powered SSD drives plugged into the glovebox USB port have been reported to cause radio frequency interference, affecting keyless entry reliability.
Programming a New or Used Key Fob
One of the best features of the Tesla system is that you do not need to visit a dealer or locksmith to program a new key fob. It is a simple DIY process that can be done directly from the vehicle's touchscreen, and it works for both new and used OEM fobs.
DIY Programming Steps:
- Get in the car with an existing, authenticated key. This can be your other key fob, a key card, or a paired phone key. This is the system's security measure to prevent unauthorized key additions.
- On the touchscreen, navigate to Controls > Locks > Keys > Add Key.
- The screen will instruct you to scan the new key fob on a specific reader location.
- For 2017-2023 Model 3 and 2020-2024 Model Y, the reader is located on the center console behind the cup holders.
- For 2024+ 'Highland' Model 3, the reader is located on one of the wireless phone charger pads.
- After the car recognizes the new fob, it will ask you to scan your *existing* authenticated key card or fob on the same spot to confirm the pairing.
- Once confirmed, the new key fob will appear in your key list on the screen. You can tap the pencil icon to give it a custom name (e.g., "John's Fob").
Your vehicle can support up to 19 total keys, which can be a mix of key cards, phone keys, and up to four key fobs.
Buying a Used Keyless Entry Transmitter
Purchasing a used OEM key fob is a great way to save money, as they are electronically identical to new ones. However, there are critical details to check to ensure you get a working part.
- Verify the Part Number: This is the most important step. For 2017-2023 Model 3 and all Model Ys, you need part number 1133148. For a 2024+ 'Highland' Model 3, you need 1819445-00-B. Do not trust listings that claim universal compatibility.
- Is It Unlocked? Unlike some automotive brands, Tesla key fobs are not permanently locked to a single vehicle. A used fob that has been properly removed from a previous vehicle's key list can be paired with another compatible car using the DIY programming steps. When buying a used car, it's a good security practice to delete any keys you didn't receive from the previous owner. 🎬 See how to add new fobs and remove old ones
- Physical Inspection: Check for cracks in the glossy plastic casing or signs of water damage. While the fobs are water-resistant, they are not fully waterproof, and a damaged case can lead to internal failure.
- OEM vs. Aftermarket: Stick with genuine, used OEM fobs. While some third-party companies sell shells or devices that mimic the key card's function in a fob-shaped body, they do not have the passive entry or button features of a true OEM key fob. A used OEM part provides full functionality at a lower cost than new.
Cost Comparison
The key fob is an optional accessory, and pricing can vary. Labor for programming is typically $0 as it is a DIY procedure.
| Part Type | Estimated Cost |
|---|---|
| New OEM (from Tesla) | $175 - $200 |
| New Aftermarket | $40 - $80 (Typically key card internals in a fob shell, no passive entry) |
| Used OEM | $80 - $150 |
| Shop Labor (Programming) | $0 (DIY) / $50-$100 (If all keys are lost and service visit is required) |
Frequently Asked Questions (FAQ)
How do I replace the battery in my Tesla key fob?
Place the fob button-side down on a soft surface. Use a small, flat-bladed tool or your fingernail to release the bottom cover. The old battery can be lifted out. Insert a new CR2032 battery with the '+' side facing up, then snap the cover back on.
Can I use a key fob from a Model Y on a Model 3?
Yes, as long as it is not a 'Highland' Model 3. The key fob (part 1133148) is interchangeable between the 2017-2023 Model 3 and the 2020-2024 Model Y.
What do I do if I lose all my keys?
If you lose all your key cards and fobs and cannot access the car with your phone key, you will need to contact Tesla Service. They can help you gain access to your vehicle and pair a new key. You can also add a new key using the Tesla mobile app if you are logged in and the vehicle has a recent software version (2022.40+).
Will a used key fob from another car work with mine?
Yes. As long as the used key fob is the correct part number for your vehicle, it can be added to your car using the simple on-screen pairing process, provided you have another working key to authorize it.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1133148 1819445-00-B
Battery Type: CR2032 3V Lithium Coin Cell
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Key Fob Compatibility: Model 3, Model Y, and the 'Highland' Refresh
- 2017-2023 Model 3 & 2020-2024 Model Y
- 2024+ Tesla Model 3 'Highland'
- Symptoms of a Failing Key Fob
- Known Issues, TSBs, and Recalls
- Programming a New or Used Key Fob
- DIY Programming Steps:
- Buying a Used Keyless Entry Transmitter
- Cost Comparison
- Frequently Asked Questions (FAQ)
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