2024 GMC Sierra 2500HD Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I frequently get questions from heavy-duty truck owners about modern smart keys. The 2024 GMC Sierra 2500HD is an absolute workhorse, but when it comes to the electronics, it’s one of the most sophisticated vehicles on the road today. Built on General Motors' advanced Global B electronic architecture, the security systems on these trucks are highly encrypted to prevent theft.

If you are looking to program a new key fob, replace a dead battery, or source a spare, here is everything you need to know about the 2024 GMC Sierra 2500HD key fob system.

Quick reference

Step-by-step on-board programming

Can you program a 2024 GMC Sierra 2500HD key fob yourself?

The short answer is no. Unlike older GM models that allowed owners to add a spare key via the Driver Information Center (DIC) if they had a working key, the 2024 Sierra 2500HD operates on GM’s highly secure CAN FD network (Global B architecture).

There is no DIY on-board programming procedure available for this vehicle. Attempting old GM tricks (like turning the key in the door lock cylinder five times) will not trigger a programming mode.

To program a new key fob to this truck, the vehicle must be connected to a high-end automotive diagnostic scanner (such as an Autel IM608 or GM's factory MDI 2 tool) with an active subscription to GM's Techline Connect (SPS2) server. The process involves a timed security delay (usually 10 to 12 minutes) and encrypted pinging between the truck's Body Control Module (BCM) and GM's cloud servers.

You will need to hire a professional automotive locksmith or visit your local GMC dealership to add or delete fobs.

Battery replacement

While programming requires a professional, changing a dead battery is a simple DIY task. The 2024 Sierra key fob uses a standard CR2032 3V lithium coin cell battery.

1. Remove the emergency key: Press the small button on the side or back of the fob and pull out the metal emergency key blade.
2. Open the fob casing: Look inside the slot where the emergency key was resting. You will see a small pry point. Use a flathead screwdriver or a trim tool to gently twist and pry the two halves of the fob shell apart.
3. Remove the old battery: Note the orientation of the battery (the "+" side should be facing down into the back cover). Gently pop the old CR2032 out.
4. Install the new battery: Place the new CR2032 into the slot, ensuring the positive (+) side faces the correct direction.
5. Reassemble: Snap the two halves of the fob back together, squeezing firmly along the edges until they click securely. Reinsert the emergency key blade.

Where to buy a replacement fob

When sourcing a replacement key fob for a 2024 Sierra 2500HD, you have a few options, but you must be careful regarding compatibility.

• Dealership (OEM): The safest, albeit most expensive, route. Buying direct from GMC ensures you get the exact part number (e.g., matching remote start and multi-pro tailgate buttons). Cost expectation: $150–$250 for the fob alone.
• Automotive Locksmith: Most reputable locksmiths stock OEM or high-quality aftermarket equivalents (like Strattec). Locksmiths often bundle the cost of the fob, the emergency key laser cut, and the programming into one flat rate. Cost expectation: $250–$350 total.
• Amazon / Online Retailers: You can find cheap aftermarket fobs online, but beware. Many cheap generic fobs will fail to program to GM's strict Global B system, costing you a programming fee for a key that doesn't work. If you buy online, verify the FCC ID (YG0G20TB1) and OEM part number exactly. Cost expectation: $40–$100 (fob only).

If on-board programming isn't supported

Because on-board programming is completely locked out on the 2024 GMC Sierra 2500HD, you must factor in labor costs when budgeting for a spare key.

The truck uses an advanced encrypted transponder system communicating via a low-frequency antenna inside the vehicle. When a dealer or locksmith programs the key, they aren't just pairing the remote buttons; they are authenticating the immobilizer chip so the BCM allows the fuel pump and starter to engage.

• Dealer Programming Cost: Usually 1 to 1.5 hours of labor, running anywhere from $150 to $250 just for the programming hookup.
• Locksmith Programming Cost: Usually slightly cheaper and far more convenient, as mobile locksmiths come to you. Expect to pay $100 to $150 for the programming and cutting service if you provide your own OEM fob.

To get back on the road safely and securely, find a mobile locksmith or shop on Repairius.