2018 GMC Sierra 1500 Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

The 2018 GMC Sierra 1500 allows for on-board programming of new key fobs, provided you have at least one currently recognized key fob. Follow these steps carefully:

1. Enter the vehicle and close all doors.
2. Insert the existing, programmed key into the ignition.
3. Turn the ignition to the "ON" position (without starting the engine) and then back to "OFF" quickly. Do this twice within five seconds.
4. Remove the existing key.
5. The Driver Information Center (DIC) should display "REMOTE LEARN PENDING" or a similar message.
6. Insert the new, unprogrammed key into the ignition.
7. Turn the ignition to the "ON" position. The DIC should display "REMOTE LEARN ACTIVE."
8. Wait approximately 5 seconds. The DIC should then display <<< (or similar arrows) to signal it's ready. Turn the ignition to "OFF" before the message goes away.
9. Remove the new key.
10. Press and hold the "LOCK" and "UNLOCK" buttons simultaneously on the new key fob for about 15 seconds. The doors should lock and unlock, indicating successful programming.
11. Repeat steps 6-10 for any additional new key fobs you wish to program.
12. To exit programming mode, turn the ignition to "ON" with any programmed key, or wait 30 seconds for the system to time out.

If you do not have a currently programmed key, on-board programming is not possible, and you will need to seek assistance from a locksmith or a GM dealership. This is because the vehicle's immobilizer system requires a registered key to enter the programming sequence.

Battery replacement

The key fob for your 2018 GMC Sierra 1500 uses a single CR2032 coin cell battery.

1. Locate the small notch or slot on the side or bottom of the key fob casing. This is usually where the key ring attaches.
2. Insert a small, flat-head screwdriver or a coin into the notch and gently twist to pry open the two halves of the fob.
3. Carefully separate the two halves. Be mindful of the internal components and don't force them apart.
4. Note the orientation of the old battery before removing it. The positive (+) side typically faces up.
5. Remove the old CR2032 battery and insert the new one, ensuring the correct orientation.
6. Align the two halves of the key fob and press them firmly together until they snap securely into place.
7. Test the functionality of your key fob with your vehicle.

Where to buy a replacement fob

When looking for a replacement key fob, you have several options, each with its own pros and cons:

• GM Dealership:
  • Pros: Guaranteed genuine OEM part, often includes cutting and programming. High reliability.
  • Cons: Most expensive option. A new fob and programming can cost anywhere from $250 - $400+.
• Independent Locksmith:
  • Pros: Often more affordable than the dealership, especially for both parts and programming. They can typically cut the key blade and program the transponder and remote function. Convenient mobile services are often available.
  • Cons: Prices can vary. Ensure the locksmith is reputable and experienced with GM immobilizer systems. Expect to pay $150 - $300 for a new fob, cut, and programmed.
• Online Retailers (e.g., Amazon, eBay, dedicated key fob sites):
  • Pros: Great for finding fobs at a significantly lower price, often $30 - $80 for the physical fob itself. Many aftermarket options are available.
  • Cons: You're only buying the physical fob. You'll still need to pay for key cutting (if it's an integrated key) and programming. Quality of aftermarket fobs can vary, so read reviews carefully. Be wary of sellers claiming "no programming needed" as that's rarely the case for secure modern vehicles.

If on-board programming isn't supported

As noted in the programming section, if you lack a working key to initiate the on-board programming sequence, you must use a professional service. This is due to the vehicle's sophisticated immobilizer system, which prevents unauthorized keys from being programmed without a master key present.

Cost Expectations: If you need a locksmith or dealer to program a new key from scratch (i.e., you have no working keys), the cost will be higher than if you provide them with a new fob and just need it programmed. This is because they have to perform a more involved procedure to add a new key to the vehicle's computer system. Expect to pay in the $200 - $400+ range depending on your location and the service provider.

Immobilizer Transponder: The 2018 GMC Sierra 1500 utilizes a transponder chip embedded within the key fob. This chip communicates with the vehicle's immobilizer system. Without proper programming of this transponder, the vehicle will not start, even if the key blade is cut correctly and the remote functions are programmed. This is a critical security feature.

Find a mobile locksmith or shop on Repairius.