2021 Nissan Frontier Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I frequently get questions about programming keys for late-model trucks. The 2021 Nissan Frontier sits in an interesting transition period for Nissan, featuring the newer 3.8-liter V6 engine but retaining much of the previous generation's interior and electronic architecture.

If you've lost a key or just need a spare for your 2021 Frontier, navigating the replacement process can be confusing. Here is the comprehensive guide to replacing and programming your 2021 Nissan Frontier key fob.

Quick reference

Step-by-step on-board programming

Unlike older vehicles where you could perform a "dance" of turning the ignition on and off to program a new key, the 2021 Nissan Frontier does not support on-board DIY programming for a fully functional key.

While older Nissans allowed you to program the keyless entry (lock/unlock) portion by inserting and removing the key from the ignition six times within 10 seconds, this procedure will not program the internal transponder chip required to actually start the engine. The 2021 Frontier is equipped with the Nissan Anti-Theft System (NATS). To start the truck, the vehicle's immobilizer module must be synced with the new key's RFID chip using a professional OBD2 diagnostic scan tool.

Attempting to start the truck with an unprogrammed key will trigger the immobilizer, keeping the engine from turning over and illuminating the red security car/key icon on your dashboard. You will need to hire a local automotive locksmith or visit the dealership to complete the programming.

Battery replacement

If your current key fob is losing range or failing to unlock the doors, you likely just need a new battery. Replacing the CR2025 battery is a simple DIY task that takes less than five minutes:

1. Remove the small screw: Look at the back of the remote head key. Use a small #0 Phillips head screwdriver to remove the tiny screw. Set it aside somewhere safe so it doesn't get lost.
2. Open the casing: Insert a small flathead screwdriver or plastic pry tool into the seam of the key casing. Gently twist to pop the two halves apart.
3. Remove the old battery: Note the orientation of the battery. The positive (+) side should be facing down into the back half of the shell. Pop the old battery out.
4. Insert the new battery: Place a fresh CR2025 battery into the slot with the positive (+) side facing the same direction as the original.
5. Reassemble: Snap the two halves of the key shell back together securely, and reinstall the small Phillips screw on the back. Test the lock/unlock buttons to confirm operation.

Where to buy a replacement fob

When sourcing a replacement key for your 2021 Nissan Frontier, you have three primary options:

• The Dealership:
  • Pros: Guaranteed OEM part, exact fit, programmed correctly on-site.
  • Cons: Most expensive route. Expect to pay anywhere from $250 to $350 for the key, cutting, and programming services.
• An Automotive Locksmith:
  • Pros: Often mobile (they come to you), generally much cheaper than the dealer, and they can supply high-quality aftermarket or refurbished OEM keys.
  • Cons: Finding a reputable, licensed locksmith requires a quick search.
  • Price: Typically $150 to $250 total for parts and labor.
• Online Retailers (Amazon, eBay):
  • Pros: Incredibly cheap parts. You can often find aftermarket replacement fobs for $15 to $30.
  • Cons: Quality control can be hit or miss. Most importantly, you still have to pay a locksmith to cut the blade and program the transponder. Some locksmiths will not guarantee programming success on customer-supplied aftermarket electronics.

If on-board programming isn't supported

Because on-board programming is not supported for the 2021 Frontier, the transponder chip (often a Philips ID46 type NATS chip) inside the key head must be registered to the vehicle's computer.

When a locksmith arrives, they will plug an advanced key programmer into your Frontier's OBD2 port under the driver's side dashboard. They will bypass or calculate the 20-digit Nissan PIN code, clear out old lost keys (if requested), and pair the new transponder to the Immobilizer Control Unit (IMMU). They will also use a specialized key cutting machine to trace your existing key or cut a new one by VIN code. Expect this specialized labor and equipment use to cost between $75 and $150, independent of the cost of the key itself.

Need help getting a new key cut and programmed for your truck? Find a mobile locksmith or shop on Repairius.