2018 Chevrolet Suburban Key Fob Programming Guide

As a locksmith and ASE-certified electrical technician, I see a lot of modern GM SUVs in the shop. The 2018 Chevrolet Suburban is a massive, highly capable family hauler, and losing a key fob for one can be incredibly frustrating. Fortunately, if you still have at least one working smart key, GM provides a fairly straightforward on-board programming procedure so you can add a spare yourself without a trip to the dealership.

Here is everything you need to know about replacing, programming, and maintaining the key fob for your 2018 Chevrolet Suburban.

Quick reference

Step-by-step on-board programming

If your 2018 Suburban is equipped with the push-to-start system (which is standard for most trims this year), you can program a new remote yourself as long as you have at least one recognized, working key fob.

Note: Canadian vehicles may require two working keys, or a dealership scan tool, due to different immobilizer regulations.

1. Prepare the vehicle: Ensure the vehicle is off. Roll down the driver’s side window to prevent accidental lockouts.
2. Use the door lock cylinder: Take the emergency mechanical key blade out of your recognized, working key fob (or use the new cut blade if it matches). Insert the key into the driver’s outside door lock cylinder.
3. Trigger programming mode: Turn the key to the unlock position five times within 10 seconds.
4. Check the dash: The Driver Information Center (DIC) on the instrument panel will display a message that says "Ready for Remote #2" (or #3, #4, depending on how many keys are already programmed).
5. Place the working key: Place the recognized key fob into the cup holder.
6. Place the new key in the pocket: Locate the key fob transmitter pocket. In the 2018 Suburban, this is usually located inside the center console storage bin, underneath the rubber mat at the bottom. Place the new, unprogrammed key fob into this pocket.
7. Program the new key: Press the ENGINE START/STOP button. The DIC will indicate that the new remote has been learned.
8. Test the fob: Remove the new key fob from the transmitter pocket. Press the UNLOCK button on the new remote.
9. Exit programming: To exit programming mode, simply press and hold the ENGINE START/STOP button for about 12 seconds, or until the vehicle turns on. Test all functions (lock, unlock, remote start, power liftgate) on the new fob.

Battery replacement

When your remote range drops or the dash displays a "Replace Battery In Remote Key" message, it's time for a fresh CR2032 battery.

1. Press the small chrome button on the side or bottom of the fob to pull out the emergency metal key blade.
2. Look at the slot where the key blade was resting. Insert a flathead screwdriver or the tip of the emergency blade into the shallow pry slot to split the two halves of the fob apart.
3. Carefully separate the plastic housing.
4. Remove the old CR2032 battery.
5. Insert the new CR2032 battery with the positive (+) side facing down toward the back cover.
6. Snap the two halves of the shell back together and reinsert the emergency key blade.

Where to buy a replacement fob

When sourcing a replacement smart key for your Suburban, you have a few options:

• Dealership: The most reliable but most expensive route. Expect to pay $250–$350 for the OEM fob, plus another $100–$150 if they require you to pay for their programming labor. Pros: Guaranteed to work, OEM quality. Cons: Very expensive.
• Automotive Locksmith: A mobile locksmith can supply an OEM or high-quality aftermarket fob, cut the emergency blade on-site, and program the fob. Total cost usually ranges from $180–$250. Pros: Convenience (they come to you), lower cost than the dealer. Cons: Pricing varies by region.
• Amazon / Online Retailers: You can buy a generic aftermarket fob online for $20–$60. Pros: Extremely cheap. Cons: Quality is a gamble, and you still have to pay a locksmith to cut the emergency HU100 high-security blade (usually $30-$50).

If on-board programming isn't supported

If you have lost all of your working keys, the DIY on-board programming method will not work. In an "all keys lost" situation, the vehicle's immobilizer system locks down to prevent theft.

You will need an automotive locksmith or a dealership equipped with a bi-directional scan tool and an active subscription to GM's Service Programming System (SPS2). A technician will need to connect to the OBD2 port, ping the GM servers to acquire the security PIN, and force the vehicle into a 10-to-12-minute security reset loop before new transponders can be introduced. Expect to pay $250 to $400 for an all-keys-lost service call depending on your location and the time of day.

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