2020 GMC Acadia Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

The 2020 GMC Acadia does not support DIY on-board programming for additional key fobs. The vehicle's sophisticated security system requires a specialized scan tool to program new key fobs and link them to the immobilizer system. This procedure typically involves accessing the vehicle's Body Control Module (BCM) or Immobilizer Control Module (ICM) to register the new key data.

Attempting to program the fob yourself without the proper equipment can lead to the vehicle not starting or the new fob not functioning correctly. Therefore, a professional locksmith or GMC dealership is required for this service.

Battery replacement

1. Locate the small button or slot on the side of the key fob. Press the button or insert a small flathead screwdriver into the slot to release the emergency key. Pull out the emergency key blade.
2. With the emergency key removed, gently pry apart the two halves of the key fob casing. You may find a small notch or seam along the edge where you can insert a flathead screwdriver or a pry tool.
3. Carefully separate the two halves. Inside, you'll see the circuit board and the CR2032 coin cell battery.
4. Note the orientation of the old battery (usually positive side up). Gently pry out the old CR2032 battery.
5. Insert the new CR2032 battery with the positive (+) side facing up.
6. Align the two halves of the key fob case and press them firmly together until they snap securely into place.
7. Reinsert the emergency key blade into the fob until it clicks.

Where to buy a replacement fob

• GMC Dealership:
  • Pros: Guaranteed genuine OEM part, often comes with a warranty, and they can program it on-site.
  • Cons: Most expensive option, typically ranging from $200-$400 for the fob and programming.
• Professional Locksmith:
  • Pros: Often more affordable than a dealership (typically $150-$300 for fob and programming), can come to your location if mobile, and often have aftermarket options that work just as well.
  • Cons: Ensure the locksmith specializes in automotive key programming and uses quality replacement parts.
• Amazon/Online Retailers:
  • Pros: Cheapest option for the fob itself (often $30-$80).
  • Cons: You still need to pay a locksmith or dealer to cut the emergency key blade and program the fob, and there's a risk of purchasing a non-compatible or low-quality aftermarket fob. Always verify the FCC ID and part numbers. The cost of cutting and programming can add another $100-$200, making the total cost similar to or sometimes more than a locksmith.

If on-board programming isn't supported

As mentioned, the 2020 GMC Acadia requires a professional with a scan tool for key fob programming. The key fob contains both the remote functions (lock, unlock, start) and an immobilizer transponder chip. This chip communicates with the vehicle's immobilizer system, which is a crucial security feature preventing the car from starting without the correct, programmed chip present.

Expect to pay between $150-$400 for a new key fob, including the cost of the fob, cutting the emergency key blade, and programming the remote and immobilizer transponder to your vehicle. This cost varies based on whether you choose a dealership or an independent locksmith, and if you provide your own fob.

Find a mobile locksmith or shop on Repairius.