2021 GMC Yukon Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2021 GMC Yukon does not support DIY, on-board key fob programming. Programming new key fobs for your 2021 Yukon requires a specialized scan tool that connects to the vehicle's OBD-II port. This process typically involves accessing the vehicle's body control module (BCM) to register the new fob's unique ID. This is a security measure implemented by General Motors to prevent unauthorized key duplication and vehicle theft.

Because of this, you will need to seek assistance from either a GMC dealership or a qualified automotive locksmith to program a new key fob. They have the necessary equipment and expertise to perform this procedure correctly and safely.

Battery replacement

1. Locate the small release button or tab on the side or bottom of the key fob. Press or slide this to release the emergency key blade. Remove the emergency key blade from the fob.
2. With the key blade removed, you'll see a small slot or indentation on the side of the fob casing. Use a flathead screwdriver or a coin to carefully pry open the two halves of the key fob. Start gently and work your way around the seam.
3. Once the fob is open, you'll see the circuit board and the CR2032 coin cell battery. Note the orientation of the battery (positive (+) side up or down) before removing it.
4. Carefully remove the old battery. You can use a small, non-metallic tool to gently pry it out if it's snug.
5. Insert the new CR2032 battery into the fob, ensuring it's oriented correctly (matching the old battery's positive/negative placement).
6. Align the two halves of the key fob casing and firmly press them back together until they snap securely into place.
7. Reinsert the emergency key blade into the fob until it clicks.
8. Test the key fob functions (lock, unlock, remote start, etc.) to ensure it's working correctly.

Where to buy a replacement fob

When considering where to purchase a replacement key fob for your 2021 GMC Yukon, you have a few options, each with its own pros and cons:

• GMC Dealership:

  • Pros: Guaranteed genuine OEM part, often comes with a warranty, and they will program it for you. You're assured compatibility.
  • Cons: Most expensive option. Expect to pay between $250 and $400 for the fob and programming. Programming fees are often separate.

• Automotive Locksmith:

  • Pros: Locksmiths can often provide and program OEM or high-quality aftermarket fobs at a significantly lower cost than a dealership. They can often come to your location (mobile service), saving you a tow. Many locksmiths can also cut the emergency key blade on-site. Pricing for parts and programming can range from $150 to $300.
  • Cons: Ensure the locksmith is reputable and experienced with modern vehicle key programming.

• Online Retailers (e.g., Amazon, eBay, dedicated auto parts sites):

  • Pros: Potentially the cheapest option for the fob itself. You can find both OEM and aftermarket fobs.
  • Cons: You'll still need to pay a locksmith or dealer for programming and key cutting. There's a risk of purchasing a counterfeit or incompatible fob, especially if not buying from a reputable seller. Price for just the fob can be as low as $50-$100, but remember to factor in programming and cutting costs.

If on-board programming isn't supported

As mentioned, your 2021 GMC Yukon requires diagnostic equipment for key fob programming. This means DIY programming is not an option. Here