2022 GMC Sierra 2500HD Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about modern GM smart keys. The 2022 GMC Sierra 2500HD uses a proximity smart key system that provides push-to-start functionality, remote start, and power tailgate operations depending on your trim level.

Whether you have lost a key, need a spare for a secondary driver, or simply need to change a dead battery, this guide will walk you through exactly what you need to know about your 2022 GMC Sierra 2500HD key fob.

Quick reference

Step-by-step on-board programming

If you live in the United States and have two currently recognized (working) key fobs, you can program a third spare fob yourself without any special tools. (Note: Canadian regulations require all programming to be done by a dealer or locksmith with a scan tool).

How to add a key fob (Requires two working keys):

1. Ensure the vehicle is off. Keep the two recognized key fobs and the new, unprogrammed key fob with you.
2. Remove the mechanical emergency key blade from one of your recognized fobs.
3. Insert the physical key blade into the driver’s side exterior door lock cylinder.
4. Turn the key to the unlock position (counterclockwise) five times within 10 seconds.
5. The Driver Information Center (DIC) on your dashboard will display "Ready for Remote #3" (or whichever number remote you are programming).
6. Place the two recognized fobs in the cupholder.
7. Place the new, unprogrammed fob into the backup transmitter pocket. On the 2022 Sierra 2500HD, this pocket is usually located at the bottom of the center console storage bin (under the rubber mat).
8. Press the engine START/STOP button once.
9. The DIC will now display "Ready for Remote #4", indicating the new fob has been successfully learned.
10. Remove the new fob from the transmitter pocket and press the UNLOCK button on it to confirm it works.
11. Press and hold the START/STOP button for 12 seconds to exit programming mode.

If you have lost all keys or only have one working key, on-board programming is locked out for security reasons. You will need a professional.

Battery replacement

When your truck's dashboard displays "Replace Battery in Remote Key," it's time for a fresh CR2032.

1. Press the small button on the side or bottom of the fob to pull out the mechanical emergency key.
2. Look inside the slot where the mechanical key was resting. You will see a small pry notch.
3. Insert the tip of the mechanical key (or a flathead screwdriver) into the notch and gently twist to separate the two halves of the plastic shell.
4. Carefully lift the circuit board if necessary, and remove the old CR2032 battery.
5. Insert the new CR2032 battery with the positive (+) side facing down towards the back cover.
6. Snap the two halves of the fob shell back together securely and reinsert the mechanical key.

Where to buy a replacement fob

Choosing where to buy your replacement fob affects both the price and the reliability of your remote.

• The Dealership: This is the most expensive route. A new OEM fob from a GMC dealer will typically cost between $150 and $250, plus another $100 to $150 for programming and cutting the emergency blade. The major pro is guaranteed compatibility and a warranty.
• Automotive Locksmith: A great middle ground. Locksmiths can source OEM or high-quality aftermarket fobs (like Strattec) and will usually cut and program the key on-site for 20% to 40% less than the dealership. Expect to pay around $200–$250 total.
• Amazon / Online Retailers: You can find cheap fobs online for $30–$50. The downside? Quality control is poor, and many locksmiths will not guarantee programming on customer-supplied electronics. If the fob's transponder chip fails to sync, you still have to pay the locksmith for their labor time.

If on-board programming isn't supported

If you only have one working key, or if you are in a region where on-board programming is disabled, the vehicle's immobilizer system must be accessed via the OBD2 port. The 2022 Sierra 2500HD uses a highly secure CAN-based immobilizer system.

Adding a key in this scenario requires a professional bi-directional scan tool (like an Autel IM608 or GM's SPS2 dealer software) and an active internet connection to ping GM's servers for security access. An automotive locksmith or dealer will connect to your truck, bypass the security gateway, and force the vehicle into learning mode. If you are in an all-keys-lost situation, standard procedure dictates clearing all previously known keys from the truck's memory before programming the new ones, ensuring anyone who finds your lost keys cannot steal your truck.

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