2015 GMC Yukon Key Fob Programming Guide

As a locksmith and ASE-certified electrical technician, I handle key and immobilizer issues daily. The 2015 GMC Yukon marks a turning point in GM’s electrical architecture, predominantly utilizing a proximity "smart key" system with push-to-start ignition. Unlike older vehicles where a simple sequence of button presses was enough to sync a remote, the 2015 Yukon relies on a tightly integrated immobilizer network. Fortunately, General Motors built in a robust on-board programming procedure for owners who already have at least one working fob and simply want to add a spare.

Below is your comprehensive guide to the 2015 GMC Yukon key fob, from battery replacement to on-board relearn procedures.

Quick reference

Item	Detail
FCC ID	HYQ1AA (Smart Key)
OEM Fob PN	13580802, 13508278 (varies by button configuration)
Aftermarket Options	Available (Dorman, Strattec, various unbranded)
Battery Type	CR2032
Programmable On-Board?	Yes (if you have at least one recognized working key)
Cuts Required?	Yes, high-security HU100 emergency blade must be laser cut

Step-by-step on-board programming

General Motors allows you to program an additional proximity key to your 2015 GMC Yukon without a scan tool, provided you currently have one recognized, working key fob. If you have lost all keys, this DIY method will not work (see the section below).

Follow these steps exactly to add a new key:

1. Prepare the keys: Have your recognized working key and the new, unprogrammed key ready. Ensure both have fresh CR2032 batteries.
2. Access the door lock: Remove the emergency physical key blade from your recognized working fob. Note: If your new fob's emergency blade hasn't been cut yet, you can still program the proximity functions, but you must use the original key blade to trigger the door lock.
3. Trigger programming mode: Insert the recognized key blade into the driver's exterior door lock cylinder. Turn the key to the Unlock position five (5) times within 10 seconds.
4. Verify DIC message: Look at the Driver Information Center (the screen in your gauge cluster). It should display a message stating "Ready for Remote #X" (where X is the next available remote number, usually 2 or 3).
5. Insert new fob into the backup pocket: Open the center console storage bin. Locate the transmitter pocket (usually at the bottom of the console bin, shaped specifically for the fob). Place the new, unprogrammed fob into this pocket.
6. Program the new fob: Press the engine START/STOP button once. When the fob is learned, the DIC will update to show that it is ready for the next remote number.
7. Test the fob: Remove the new fob from the console pocket. Press the UNLOCK button on the new fob to verify it has synced.
8. Exit programming mode: Press and hold the START/STOP button for about 12 seconds to exit programming mode, or simply use the recognized key to turn the vehicle on and off.

Battery replacement

The 2015 GMC Yukon smart key requires a standard CR2032 coin-cell battery.

1. Press the small release button on the side or back of the fob and pull out the emergency key blade.
2. Look inside the slot where the key blade was resting. You will see a small seam in the plastic housing.
3. Insert a flathead screwdriver (or the tip of the key blade itself) into this seam and gently twist to pry the two halves of the fob shell apart.
4. Remove the dead CR2032 battery and insert the new one, ensuring the positive (+) side is facing the correct direction (usually down into the back cover).
5. Snap the two halves of the shell firmly back together.

Where to buy a replacement fob

The Dealership:

• Pros: Guaranteed correct part number matching your VIN, full warranty, and OEM quality.
• Cons: Expensive. Expect to pay $150–$250 for the fob itself, plus another $100–$150 if you need them to program it and cut the emergency blade.

Automotive Locksmith:

• Pros: Mobile service that comes to you. Locksmiths can supply OEM or high-quality aftermarket (Strattec) fobs. Often 20-30% cheaper than the dealer.
• Cons: Prices vary by region.

Amazon / Online Retailers:

• Pros: Very cheap. You can find aftermarket fobs for $40–$80.
• Cons: Quality control is highly variable. Cheap circuit boards frequently fail, have poor range, or refuse to program entirely. You will still need to find a local locksmith to laser-cut the HU100 emergency key blade.

If on-board programming isn't supported

If you have lost all working keys to your 2015 GMC Yukon, or if a previous owner disabled the customer DIY add-a-key feature (sometimes done on fleet/rental vehicles), you cannot use the door-lock cylinder method.

The vehicle's immobilizer system requires a secure handshake to authorize a new master key. In an "All Keys Lost" situation, an ASE-certified technician or professional locksmith must connect an advanced diagnostic scan tool (like an Autel IM608 or GM GDS2 interface) to the vehicle's OBD-II port. The technician will request security access from GM's servers, wipe the old keys from the immobilizer module's memory, and program your new fobs. Expect to pay between $200 and $350 total for a mobile locksmith to arrive on-site, cut the high-security blade, and program the module.

Find a mobile locksmith or shop on Repairius.