2019 GMC Sierra 1500 Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Important: This DIY procedure is for programming the Remote Keyless Entry (RKE) functions of a new key fob. To start the vehicle, the integrated key blade will need to be cut and the immobilizer transponder programmed by a locksmith or dealer. You must have one working key fob to perform this on-board programming procedure for additional fobs.

1. Gather all key fobs (working and new ones) you wish to program.
2. Close all vehicle doors.
3. Insert the working key fob into the ignition.
4. Turn the ignition to the "ON" position (do not start the engine).
5. Wait for the "Press START/STOP button to program remote" message to appear on the Driver Information Center.
6. Press and hold the unlock and lock buttons on the working key fob simultaneously for about 15 seconds. The doors should lock and unlock, or the horn may chirp, indicating successful programming.
7. Remove the working key fob from the ignition.
8. Insert the new (unprogrammed) key fob into the ignition.
9. Turn the ignition to the "ON" position (do not start the engine).
10. Press and hold the unlock and lock buttons on the new key fob simultaneously for about 15 seconds. The doors should lock and unlock, or the horn may chirp.
11. Repeat steps 8-10 for any additional new key fobs you wish to program.
12. Once all fobs are programmed, turn the ignition to the "OFF" position and remove the key. Test all fobs to ensure they function correctly.

Battery replacement

Replacing the battery in your 2019 GMC Sierra 1500 key fob is a straightforward process:

1. Locate the small release button on the side of the key fob. Press this button to release the emergency key blade and pull it out.
2. With the key blade removed, you'll see a small slot or indentation on the side of the fob. Use a small flathead screwdriver or prying tool to carefully pry open the two halves of the key fob casing.
3. Once opened, you'll see the CR2032 coin cell battery. Note the orientation (+/-).
4. Gently pop out the old battery and insert the new CR2032 battery with the positive (+) side facing up.
5. Carefully align the two halves of the key fob and snap them back together. Reinsert the emergency key blade.

Where to buy a replacement fob

• GM Dealership:

  • Pros: Guaranteed genuine OEM part, high-quality, professional programming (including transponder). Often the safest option if you've lost all keys.
  • Cons: Most expensive option. Expect to pay anywhere from $200-$400+ for the fob and programming.

• Independent Locksmith:

  • Pros: Often significantly cheaper than a dealership for both the fob and programming. Many mobile locksmiths can come to your location. They can cut and program the key blade and transponder.
  • Cons: Quality of aftermarket fobs can vary. Ensure the locksmith uses a reputable brand or genuine OEM parts if preferred. Cost generally ranges from $150-$250 for a new fob and full programming.

• Amazon/Online Retailers:

  • Pros: Cheapest option for the physical fob itself. Ideal if you only need the RKE portion and plan to do the on-board programming yourself (and you already have a working key).
  • Cons: You're buying just the shell and electronics; you'll still need the key blade cut and the transponder programmed for starting the vehicle. Risk of purchasing a non-compatible or low-quality aftermarket fob. Prices for just the fob can be as low as $30-$70.

If on-board programming isn't supported

While the 2019 GMC Sierra 1500 supports on-board programming for the Remote Keyless Entry (RKE) portion with at least one working key, the immobilizer transponder (which allows the truck to start) always requires specialized equipment. If you've lost all your keys or need the transponder programmed for a new key, on-board methods won't suffice.

• Cost Expectations: If you need a new key cut and programmed from scratch (no working keys), anticipate costs similar to what's listed for dealerships or independent locksmiths above. A mobile locksmith will often be the most convenient and cost-effective solution in this scenario, as they can come to you and perform all necessary services on-site.

• Immobilizer Transponder: The 2019 GMC Sierra 1500 uses a rolling code transponder system integrated into the key fob. This system communicates with the vehicle's engine control unit (ECU). Without proper transponder programming, the vehicle's immobilizer will prevent the engine from starting, even if the key blade fits the ignition.

Find a mobile locksmith or shop on Repairius.