2023 GMC Sierra 1500 Key Fob Programming Guide

As a locksmith and ASE-certified electrical technician, I see a lot of modern trucks come through the shop for key fob issues. The 2023 GMC Sierra 1500 is a fantastic piece of machinery, but when it comes to the electronics, GM has significantly tightened security. The days of simply turning the key in the ignition a few times to program a new remote are long gone for this generation.

If you've lost a key or just need a spare for your 2023 Sierra 1500, here is everything you need to know about replacing, programming, and maintaining your key fob.

Quick reference

Step-by-step on-board programming

Important Notice: The 2023 GMC Sierra 1500 utilizes GM’s advanced Global B (VIP) electrical architecture. Because of this high-level security system designed to prevent theft, there is absolutely no DIY on-board programming procedure available for this vehicle.

In older GM trucks, you could insert a recognized key, cycle the ignition, and learn a new fob. For the 2023 Sierra, the vehicle's immobilizer and keyless entry system must be accessed via the OBD-II port using a specialized diagnostic scan tool connected to GM's Service Programming System (SPS2).

If you purchase a new fob, you must take it to a qualified automotive locksmith or a dealership to have it paired to your truck's computer. Attempting cheap OBD dongle programmers found on the internet will not work on the 2023 CAN FD network and could potentially lock down your vehicle's immobilizer module.

Battery replacement

Even if you can't program the fob yourself, changing a dead battery is a quick and easy DIY task. The 2023 Sierra fob uses a standard CR2032 coin-cell battery.

1. Remove the emergency key: Press the small silver release button on the side or back of the fob and pull out the physical emergency key blade.
2. Open the fob casing: Look into the slot where the emergency key was just removed. You will see a small pry notch. Insert a flathead screwdriver (or the tip of the emergency key itself) into this notch and gently twist to pop the two halves of the plastic shell apart.
3. Remove the old battery: Carefully lift the circuit board if necessary, and slide the old CR2032 battery out of its housing.
4. Insert the new battery: Slide the new CR2032 battery into the slot with the positive (+) side facing downward (towards the back cover of the fob).
5. Reassemble: Snap the two halves of the fob shell back together firmly. Reinsert the emergency key blade until it clicks. Test your buttons.

Where to buy a replacement fob

When securing a replacement fob for a late-model Sierra, you have three main avenues, each with its own pros and cons:

• The Dealership: This is the most straightforward but most expensive route. You are guaranteed the correct OEM part (verifying your specific tailgate and remote start functions via VIN). Expect to pay between $250 and $400 for the fob, the emergency key cut, and the programming labor.
• Automotive Locksmith: A specialized mobile auto locksmith is usually the best balance of cost and convenience. They carry the necessary CAN FD scan tools and can often come directly to you. A locksmith will usually charge between $150 and $250 for the entire service (fob, cut, and programming).
• Amazon / Online Retailers: You can find aftermarket or refurbished OEM fobs online for $40 to $100. The Pros: Cheap upfront cost. The Cons: Many locksmiths and dealers will refuse to program customer-supplied electronics due to high failure rates. Furthermore, if the programming fails because the fob is defective, you will still be charged for the labor.

If on-board programming isn't supported

Since on-board programming is not supported on the 2023 GMC Sierra 1500, you have to rely on professionals. The immobilizer transponder in this truck uses encrypted rolling codes that constantly handshake with the Body Control Module (BCM).

When a locksmith or dealer programs your new key, they use a computerized scan tool to request a secure PIN from GM's servers. Once authorized, the scan tool forces the truck's computer into "learn mode." The technician then places the new fob in the truck's designated backup pocket (usually located in the center console) so the BCM can marry the new transponder chip to the truck's immobilizer system. Finally, the technician will use a CNC laser key cutter to duplicate your emergency blade so you can unlock your door if the truck's battery ever dies.

Because of the expensive equipment and software subscriptions required to perform this, expect the programming labor alone to cost anywhere from $75 to $150.

Don't let a lost key ruin your day or leave you stranded. Find a mobile locksmith or shop on Repairius.