2020 Toyota Tacoma Key Fob Programming Guide

As a locksmith and ASE-certified electrical technician, I see a lot of modern trucks roll into the shop for lost keys or broken fobs. The 2020 Toyota Tacoma is an incredibly popular midsize truck, but when it comes to key fob programming, it is not a DIY-friendly vehicle. Toyota beefed up their immobilizer security significantly in recent years, meaning the days of opening and closing your door while turning the key in the ignition to program a remote are long gone.

Whether you have the standard turn-key ignition (H-Chip) or the Push-to-Start Smart Key system, here is everything you need to know about getting a new key fob for your 2020 Toyota Tacoma.

Quick reference

Step-by-step on-board programming

If you are looking for a sequence of door-slams, brake-pedal presses, and ignition turns to program your 2020 Tacoma fob yourself, I have to be the bearer of bad news: DIY on-board programming is not supported on the 2020 Toyota Tacoma.

Toyota utilizes an advanced immobilizer system (typically an 8A "H-Chip" for standard ignitions or a highly secure proximity system for push-to-start models). To program a new key or fob, you must access the vehicle's OBD2 port using a professional scan tool (like an Autel IM608, Advanced Diagnostics Smart Pro, or Toyota’s factory Techstream software).

Because of this, you will need to hire a professional or purchase a dedicated OBD2 programming dongle (like Tom's Key Company or similar DIY OBD2 kits) if you want to pair a new remote to the truck.

Battery replacement

If your current fob has simply stopped working or has poor range, you likely just need a new battery. The 2020 Tacoma fobs use a standard CR2032 coin-cell battery.

1. Remove the emergency key: Press the small release button on the side or bottom of the fob and pull out the metal emergency key blade.
2. Pry the fob open: Insert the tip of the emergency key (or a small flathead screwdriver) into the slot left by the key blade and gently twist. The two halves of the plastic shell will pop apart.
3. Remove the circuit board: Carefully lift the green circuit board to reveal the battery underneath.
4. Swap the battery: Remove the old CR2032 battery and insert the new one with the positive (+) side facing up.
5. Reassemble: Snap the two halves of the plastic shell back together and slide the emergency key back into place. Test the buttons to ensure it works.

Where to buy a replacement fob

When buying a new key fob for your Tacoma, you have three main avenues:

• The Dealership: The most expensive but most reliable route. An OEM key fob from the dealer will cost between $150 and $250 for the part alone. Programming and cutting will add another $100 to $150. Pros: Guaranteed to work, OEM quality. Cons: Very expensive, requires a tow if you have no working keys.
• Automotive Locksmith: A mobile auto locksmith can supply an OEM or high-quality aftermarket fob. Pros: They come to you, they can cut the key on-site, and they are usually 20% to 40% cheaper than the dealer. Total cost is usually around $180–$250 all-in. Cons: Aftermarket keys can sometimes feel slightly cheaper than OEM, so ask what brand they use.
• Amazon / Online Retailers: You can buy aftermarket fobs online for $20 to $50. Pros: Very cheap upfront cost. Cons: You still have to pay a locksmith to cut and program it (usually $75–$120). Furthermore, many locksmiths will not guarantee customer-supplied parts; if the cheap online chip is defective and fails to program, you still have to pay the locksmith for their labor time.

If on-board programming isn't supported

Since on-board programming is not an option for the 2020 Tacoma, you have to factor professional labor into your replacement cost. The truck's computer must authorize the new immobilizer transponder before it will allow the fuel injectors and starter to operate.

If you lose all your keys, the situation becomes an "All Keys Lost" scenario. For modern Toyotas, this used to require an expensive immobilizer reset or even replacing the ECU. Fortunately, most modern locksmiths have the software to emulate a master key and bypass the immobilizer to add new keys without replacing computer modules. Expect an "All Keys Lost" service to cost between $250 and $400 depending on your location and whether you have a push-to-start or turn-key ignition.

Find a mobile locksmith or shop on Repairius.