How to Open a GMC with a Dead Key Fob
Getting into Your GMC
- But first, if you are already inside, click here for help getting started!
- Second, for video help, click here!
- Finally, if you need another manufacturer, click here.
Retrieving the Mechanical Key
Keyless or push button start GMC models use the third of three GM key styles. A mechanical key is held inside the fob and is needed to get into the vehicle.
There are two slightly different shapes, but each operates in the same basic way. There is a button on the side of the key fob or transmitter near the key ring, as shown above. To remove the mechanical key, press the button and pull the key away.
Getting Inside
If a key hole is visible at the back of the driver’s door handle, simply insert the key and turn and you’re in.
Unfortunately, many GM models hide the key holes under a cap at the back of the driver’s door, and this includes the GMC 
Acadia and Terrain. To remove the cap, pull the door handle out to the open position. Insert the key into the slot on the bottom of the cap (3, right).
Push it as far upwards as possible and hold upward pressure. Then pry outward. And yes, you WILL feel like you are prying off a piece of your car! Move the cap rearward revealing the key cylinder. Now the mechanical key can be used in the cylinder. Look for a video here to help.
To replace the cap, insert the two tabs at the back of the cap between the black seal and the metal base. Pull the door handle out to the door open position and move the cap forward and press to snap it into place. You can then release the door handle.
Remember, getting IN the car is most important. If you have difficulty replacing the cap, don’t. Let your dealer do it when you get a new battery for your Key FOB!
Continue to Part II, Getting Started …
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
Here’s the deal: Buckle up, find your model, and if your start battery is still good, we’ll get you underway. Note that they are generally presented as sedans, then SUVs then pick ups.
In Corvette models built before 2014 (C6), the pocket is on the left of the inside of the glove box. Place the transmitter in the pocket with the buttons facing the glove box storage area (right). Then, with the vehicle in P (Park) or N (Neutral), press the brake pedal and the Start / Stop ignition button as normal.
transmitter in the pocket with the buttons facing up. Again, with the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal. Find a helpful video 
Push button or keyless start is introduced to the Camaro in 2016. It also uses the cup holder as a back up slot, but to their credit, Chevrolet made this one simple. Make sure there is nothing, particularly coins, in the rear cup holder, and simply drop the fob into it. The car will recognize the key and a press of the brake pedal and Start / Stop ignition button will have you on your way. Corvettes (C8), 2020 – 2023, use this spot as well. In 2024, the Corvette spot is moved to the front cup holder.
The Impala uses a back up pocket located in the front of the center console (right). The model is using the flip key thus far through 2018. Drop transmitter into the pocket with the key ring up and the buttons facing out. With the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal.
storage area located above the infotainment screen and remove the rubber mat. Extend the key blade and place the blade into the slot (right).
moved to the center console, as shown. The rubber mat at the bottom of the console will need to be removed, and so anything actually in the console.
The last flip key back-up start option belongs to the Cruze. You must remove the plastic trim piece from the small storage area next to the accessory power outlet near the front of the console. Extend the key blade and insert it into the transmitter slot (right). With the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal.
The 2017 Cruze gets the new key and a new back up location, which is the front cup holder, as seen to the right. Sonic, Equinox and Blazer models now use this spot as well.
The 2024 Blazer Electric Vehicle (EV) is a different animal. Its back up spot is at the bottom of the center console storage area. Drop the key fob on the spot shown (right) with the buttons up.
The Trax, which first saw push button start in 2017, also uses the front cup holder as its back up slot. However, there are three cup holders in the center console area, with the front one being separated from the two behind it. Be sure to use the one in the very front. See the image to right.
The new Trailblazer model has the back up pocket in front of the center console storage area and behind the the two cup holders on the console (image at right). Drop the key fob into the pocket or depression, The manual states that the buttons should be facing the front, but we don’t believe this is possible given the shape of the pocket. We also believe that it will not likely matter. With the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal.
pocket also located in the face of the front of the inside of the center console. However, the pocket points down, as shown to the right. Slide the transmitter into the pocket with the key ring facing out, buttons forward (in the Suburban we had on hand, the engine started with the buttons facing either way). It is a loose fit, so don’t be concerned. With the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal. Check out the video 
In the Chevrolet Traverse, through 2023, the transmitter pocket is at the bottom of the center console storage area, as seen in the image to the right. The outline of the transmitter will be visible to the front of the console. The 2024 Traverse uses the left or driver’s side cup holder, exactly like the Silverado EV below. Once the fob is in place, press the brake pedal and the Start / Stop ignition button as normal to start the vehicle.
shown in the manual. There are three storage spots in the console (see the red arrows), and one of them will be the “pocket” but none of them are actually marked. Drop the transmitter or key fob in the front storage spot first and attempt to start the car normally, with your foot on the brake and pressing the Start / Stop button.
In the Silverado pick up (note that the electric version is discussed below) and the Malibu sedan, the pocket for the transmitter is located in the face of the rear of the inside of the center console. Silverado gets push button start for the first time in 2019. Slide the transmitter into the pocket with the key ring facing up, and the buttons out (or however it will fit!).
the Start / Stop ignition button as normal. The pocket in 2021 Tahoe and Suburban models with a bench seat is also moved to this location, at the back of the console.
transmitter into the left side cup holder (second image below right).
message to Step on the Brake. Press the brake pedal very, very hard when trying to start the vehicle again to be sure that the release switch behind the pedal is engaged. Or wait a few minutes and try again.
GM Now Uses 17 Differing Back-up Pockets
Too Many Back Up Start Locations
GM Now Uses 17 Differing Back-up Pockets! While putting together a review of 2018 push button start models, we discovered that the new GMC Terrain and Acadia had been added, and that this was introduced in the Acadia in 2017.
In addition, these two models have hidden key holes, like those used by Chevrolet. But what struck us was that the cars did not use the same back up start process, and that the spots are only similar to other General Motors made cars and SUVs.
The result is we now have 17 distinct images of back up start key fob pockets. We keep asking and hoping for standardization, but instead…
Similar, Not the Same
The Terrain uses a cup holder.
But because they are side by side, it is the first to use a left side cup holder. The Chevrolet Camaro uses the back one while the Buick Encore and Envision use the front. The Verano, Regal and Lacrosse also use the front, but the cup holder itself needs to be removed! And so on.
Standardize!
The point is, there is no standardization and unfortunately the company does not seem to be headed anywhere near selecting a single back up location.
Why not? Seriously, why not??? Following the key cylinder debacle GM announced it would move all their vehicles to push button or keyless start, eventually, and we suggested then that they use the opportunity to standardize the process. They didn’t, not that they were listening to us.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY