2017 Toyota Tundra Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2017 Toyota Tundra does not offer a simple do-it-yourself (DIY) or on-board programming procedure for new key fobs. Unlike older vehicles that might use a series of key turns and door lock cycles, all 2017+ Tundra models require specialized diagnostic equipment to program new keys and remotes. This is due to the advanced security of the vehicle's immobilizer system.

To program a new key fob, you will need to contact a dealership or an automotive locksmith. They will use a professional scan tool that communicates with your truck's computer to register the new key.

Battery replacement

Replacing the battery in your existing fob is a simple task you can do at home.

1. Release the mechanical key: Look for a small release button or slider on the side or back of the fob. Press it and pull the metal key blade out from the bottom of the fob.
2. Open the case: Insert the tip of the mechanical key (or a small flathead screwdriver) into the slot created where the key was removed. Gently twist to pry the two halves of the fob shell apart.
3. Replace the battery: The fob uses a single CR2032 3V coin battery. Note the orientation of the old battery (+ side up or down) before removing it. Pop the new battery into place, ensuring it is seated correctly with the same orientation.
4. Reassemble: Snap the two halves of the fob shell back together firmly. Re-insert the mechanical key. Test the fob's functions (lock, unlock, etc.) to ensure it is working.

Where to buy a replacement fob

• Dealership: The most expensive option, but guarantees you receive a genuine OEM part. Expect to pay anywhere from $200 to $400 for the fob itself, plus another $100–$200 for programming and key cutting.
• Automotive Locksmith: A professional locksmith can often provide and program OEM or high-quality aftermarket fobs for less than the dealer. This is often the most convenient option, as many locksmiths are mobile. Ballpark cost is typically $150–$300 for the fob and all associated services.
• Online (Amazon, eBay, etc.): You can find many aftermarket fobs online for as little as $25–$75. While this is the cheapest route for the hardware, you still need to factor in the cost of having a locksmith or dealer program it and cut the key blade. Be cautious of quality and ensure the FCC ID (GQ4-52T) matches your vehicle.

If on-board programming isn't supported

As mentioned, the 2017 Tundra requires a scan tool because of its sophisticated immobilizer system. The key fob contains a transponder chip (in this case, a Toyota "H" chip) that is wirelessly authorized by the truck's engine control unit (ECU) before it will allow the engine to start. This prevents theft by hot-wiring.

Programming a new key involves using a diagnostic tool to put the vehicle into a special programming mode and securely register the unique ID of the new transponder chip with the ECU. Without this step, the remote functions (lock/unlock) might be programmable, but the truck will not start with the new key. This security measure necessitates professional equipment and expertise.

Find a mobile locksmith or shop on Repairius.