2023 GMC Sierra 2500HD Key Fob Programming Guide

As a locksmith and ASE-certified electrical technician, I see a lot of modern trucks roll through the shop, and the 2023 GMC Sierra 2500HD is a frequent visitor. GM has significantly beefed up their electrical architectures over the last few years, meaning the days of simple pedal-dance or ignition-cycling key programming are largely behind us. If you've lost your fob or just want to add a spare for your 2500HD, it’s important to understand exactly what you are dealing with before buying parts online.

Here is the essential information for your 2023 GMC Sierra 2500HD key fob.

Quick reference

Step-by-step on-board programming

If you are hoping to jump into the driver's seat and program a new fob yourself, I have to deliver some bad news: The 2023 GMC Sierra 2500HD does not support DIY on-board programming.

Starting around 2020-2021, General Motors transitioned their full-size trucks to the Global B electrical architecture (also known as Vehicle Intelligence Platform or VIP). This system utilizes a CAN FD (Controller Area Network Flexible Data-rate) network that heavily encrypts the vehicle’s security systems, including the immobilizer and keyless entry modules.

To program a key to this truck, a professional must do the following:

1. Connect a CAN FD-compatible J2534 pass-through device or high-end scan tool (like an Autel IM608 with a CAN FD adapter) to the OBD2 port.
2. Connect the vehicle to a battery maintainer, as the process can take time and voltage drops will fail the procedure.
3. Log into the GM Service Programming System (SPS2) online or use specialized locksmith software to request security access.
4. Place the new, unprogrammed fob into the designated backup pocket (usually located inside the center console).
5. Follow the tool's 12-minute security wait protocol to clear old keys or add the new smart key to the vehicle's immobilizer.

Attempting to bypass this system is impossible for the average DIYer. You will need to hire a professional.

Battery replacement

Even though you can't program the fob yourself, you can easily replace a dead battery. The 2023 GMC Sierra 2500HD fob uses a standard CR2032 coin cell battery.

1. Press the small silver release button on the side of the fob to slide out the emergency metal key blade.
2. Look inside the slot where the key blade was resting. You will see a small pry notch.
3. Insert a flathead screwdriver or the tip of the key blade into the notch and gently twist to split the two halves of the fob shell apart.
4. Remove the circuit board to access the battery on the back shell.
5. Pop out the old battery and insert the new CR2032 battery with the positive (+) side facing down toward the back cover.
6. Snap the two halves of the fob back together and reinsert the emergency key blade. Test the buttons.

Where to buy a replacement fob

When buying a replacement fob, you have a few avenues, each with its own pros and cons:

• The Dealership: This is the most straightforward route. You are guaranteed an exact OEM match (like PN 13541567), and they will handle the programming and laser-cutting of the emergency blade. The downside? Cost. Expect to pay anywhere from $350 to $500+ for the fob, cutting, and labor.
• Automotive Locksmith: A qualified mobile locksmith is usually faster and cheaper than the dealer. Many locksmiths stock OEM or high-quality aftermarket fobs. They can cut the key on-site and program the truck in your driveway. Expect to pay between $250 and $350 total.
• Amazon / Online Retailers: You can buy unlocked OEM or aftermarket fobs online for $50 to $100. However, you must ensure the FCC ID (YG0G20TB1) matches your original. Warning: Many dealerships will refuse to program a key you bought online, and some locksmiths will charge a premium or offer no warranty if an online fob fails to program.

If on-board programming isn't supported

Because on-board programming is disabled on the 2023 Sierra 2500HD, your immobilizer transponder (integrated into the smart key's circuit board) must be digitally paired with the vehicle's Body Control Module (BCM) via an active connection to GM's servers or specialized locksmith bypassing software.

If you lose all your keys, the situation becomes an "All Keys Lost" scenario. This takes longer and is more expensive, as the technician has to force the vehicle into a learn mode, erase all existing keys from the computer, and then pair the new ones. It is highly recommended to always keep a secondary programmed fob in a safe place to avoid the premium costs of an "All Keys Lost" service call.

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