2018 GMC Acadia – Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

The 2018 GMC Acadia supports on-board programming for its key fobs, meaning you can program new remotes yourself without specialized tools. This procedure will program all currently recognized key fobs, and any previously programmed fobs that are not present during this procedure will no longer work, so ensure all fobs you wish to use are with you.

Here's how to program a new key fob to your 2018 GMC Acadia:

1. Get in the vehicle: Close all doors.
2. Insert the working key: Insert an already programmed vehicle key into the ignition. If you do not have a working key, this procedure will not work, and you will need a locksmith or dealer.
3. Turn the ignition ON: Turn the key to the ON position (do not start the engine) and then immediately turn it to the OFF position.
4. Remove the key: Remove the working key from the ignition.
5. Insert the new key: Insert the new, unprogrammed key into the ignition within 5 seconds of removing the working key.
6. Turn the ignition ON: Turn the new key to the ON position within 5 seconds of inserting it. The vehicle's Driver Information Center (DIC) should display "READY FOR REMOTE #2" or "REMOTE LEARN PENDING. PRESS UNLOCK ON NEW REMOTE".
7. Hold Unlock/Lock: Press and hold the "Unlock" and "Lock" buttons on the new key fob simultaneously for about 15 seconds. The DIC will confirm successful programming, typically by displaying "REMOTE LEARNED".
8. Repeat for additional fobs: If you have more fobs to program, repeat steps 5-7 for each additional fob within 1 minute of the previous programming.
9. Exit programming mode: To exit programming mode, turn the ignition off and remove the key. Test all fobs to ensure they work correctly.

Battery replacement

The 2018 GMC Acadia key fob uses a CR2032 coin cell battery. Replacing it is a straightforward process:

1. Separate the key fob: Look for a small notch or slot on the side of the key fob. Use a small flat-head screwdriver or a coin to gently pry the two halves of the fob apart.
2. Remove the old battery: Note the orientation of the old battery (usually positive side up). Carefully pry out the old CR2032 battery.
3. Insert the new battery: Insert the new CR2032 battery with the positive (+) side facing up.
4. Reassemble the fob: Carefully snap the two halves of the key fob back together until you hear a click. Test the fob to ensure it works.

Where to buy a replacement fob

When considering a replacement key fob for your 2018 GMC Acadia, you have a few options, each with pros and cons:

• GM Dealership:
  • Pros: Guaranteed genuine OEM part, often comes with programming service included.
  • Cons: Most expensive option, typically ranging from $200-$400 for the fob and programming.
• Automotive Locksmith:
  • Pros: Can often provide OEM or high-quality aftermarket fobs, and sometimes offer mobile service for convenience. Prices are usually more competitive than dealerships.
  • Cons: Quality of aftermarket fobs can vary; ensure the locksmith uses reputable brands. Expect to pay between $150-$300 for the fob and programming.
• Online Retailers (e.g., Amazon, eBay):
  • Pros: Cheapest option for the fob itself, often under $50 for an aftermarket unit. You can then use the DIY programming method if you have a working key.
  • Cons: Risk of purchasing a non-compatible or low-quality fob. The key blade, if integrated, will still need to be cut by a locksmith or hardware store for an additional fee (typically $20-$50).

Immobilizer Transponder

Your 2018 GMC Acadia is equipped with an immobilizer system to prevent theft. The key fob contains a transponder chip which communicates with the vehicle's immobilizer when the key is in the ignition. This is separate from the remote keyless entry functions. While the on-board procedure will program the remote functions, the immobilizer transponder portion of a new key (if it's an integrated key/fob combo that needs to start the car) may still require a locksmith or dealer to program, especially if you do not have two working, programmed keys. However, for adding just the remote function to an existing, already programmed key, the on-board method is sufficient.

Find a mobile locksmith or shop on Repairius.