2019 Toyota Tacoma Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about modern Toyota truck keys. The 2019 Toyota Tacoma is a rugged, reliable midsize truck, but when it comes to replacing and programming its key fobs, the security systems are strictly modern. Toyota uses a highly secure immobilizer system (often utilizing an "H" chip for turn-to-start models or a complex proximity system for push-to-start models) which has effectively eliminated the old "open the door and cycle the ignition" DIY programming tricks.

Here is your comprehensive guide to the 2019 Toyota Tacoma key fob, including replacement, battery changes, and programming expectations.

Quick reference

Item	Detail
FCC ID (Smart Key / Push-to-Start)	HYQ14FBA
FCC ID (Standard Key / Turn-to-Start)	GQ4-52T
OEM Fob PN	89904-04050 (Smart) / 89070-04120 (Standard)
Aftermarket Options	Available (Keyless2Go, Ilco, various Amazon/eBay brands)
Battery Type	CR2032 (Smart Key) / CR2016 (Standard Key)
Programmable On-Board?	No (Requires diagnostic scan tool)
Cuts Required?	Yes (Laser cut for smart key insert, standard edge for ignition key)

Step-by-step on-board programming

The 2019 Toyota Tacoma does NOT support DIY on-board programming.

In older vehicles, you could perform a "chicken dance" (opening and closing doors, turning the key on and off) to sync a remote. However, for the 2019 Tacoma, both the turn-to-start (H-chip transponder) and the push-to-start (Smart Key) systems require a direct connection to the vehicle’s OBD-II port.

To program a new key, you must use a professional-grade scan tool (like Toyota’s Techstream software, Autel IM608, or Smart Pro). The tool must communicate with the vehicle's Immobilizer ECU to register the new transponder chip and remote functions. If you purchase an aftermarket DIY programming dongle (like Tom's Key Company), you can follow their specific app-based instructions, but generally, the process looks like this for a professional:

1. Connect the diagnostic scan tool to the Tacoma’s OBD-II port under the driver’s side dashboard.
2. Turn the ignition to the "ON" position (or press the start button twice without your foot on the brake).
3. Navigate to the Immobilizer/Smart Key menu on the scan tool.
4. Select "Add a Key."
5. Hold the registered, working key near the ignition/start button until it beeps.
6. Within 30 seconds, hold the new unregistered key near the ignition/start button.
7. Wait for the tool to confirm successful registration.

Unless you are buying a DIY kit that includes an OBD-II programmer, you will need to hire a professional to perform these steps.

Battery replacement

If your Tacoma fob is randomly failing to unlock doors or the push-to-start isn't recognizing the key, you likely just need a new battery.

For the Smart Key (Push-to-Start) - CR2032:

1. Press the "PUSH" button on the side of the fob and pull out the emergency metal key.
2. Insert the tip of the metal key (or a small flathead screwdriver) into the slot inside the fob where the emergency key just came out.
3. Gently twist to pop the two halves of the fob shell apart.
4. Remove the green circuit board to expose the battery.
5. Pop out the old CR2032 battery and insert a new one with the positive (+) side facing up.
6. Snap the fob back together and slide the emergency key back in.

For the Standard Key (Turn-to-Start) - CR2016:

1. Use a small flathead screwdriver to pry open the notch on the side of the plastic key head.
2. Pull the remote module out of the key shell.
3. Carefully open the plastic tabs on the remote module to expose the battery.
4. Replace the old CR2016 battery, ensuring the positive (+) side is facing up.
5. Snap the module back together and place it back into the key shell.

Where to buy a replacement fob

When getting a new fob, you have a few options, each with its own pros and cons:

• The Dealership: Going to a Toyota dealer guarantees you get a genuine OEM fob (PN 89904-04050 or 89070-04120). However, it is the most expensive route. Expect to pay $150–$250 for the part, plus $120–$180 for programming and cutting.
• Automotive Locksmith: A mobile locksmith can often provide both OEM and high-quality aftermarket fobs. They will come to your location, cut the key on-site, and program it. This usually costs 20% to 40% less than the dealership and saves you a tow if you've lost all your keys.
• Amazon / eBay: You can buy aftermarket fobs online for $20–$60. While this is the cheapest option for the part, you will still need to find a locksmith willing to cut and program a customer-supplied key. Some locksmiths will not guarantee aftermarket keys because of spotty build quality, and if the chip is a dud, you still have to pay for their labor time.

If on-board programming isn't supported

As mentioned, you cannot program this key yourself without special equipment. The 2019 Tacoma uses advanced immobilizer systems to prevent theft. The turn-to-start models use a physical H-chip transponder that must be authenticated by the ignition coil, while the push-to-start models use a proximity rolling-code system.

If you have lost all of your keys (an "All Keys Lost" situation), the job becomes significantly more difficult and expensive. The technician may need to reset the Immobilizer ECU using specialized seed-code calculators to authorize a new master key. Because of this, it is highly recommended to always keep a spare key on hand. Expect a standard spare key addition to run $150–$250 total at a locksmith, whereas an "All Keys Lost" situation can cost $350–$500+.

Find a mobile locksmith or shop on Repairius.