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
(IA) (remote control or ‘clicker’) key styles. Two of the key fobs use a sliding release on the back side to release the key. Two new key fobs use a push button to release the mechanical key, and one is much easier than the other to use. Another holds the key inside the fob itself and is really difficult to remove.
To release the mechanical key blade in your IA key fob, slide the release on the back of the transmitter and pull the blade out. You can now use the mechanical key to unlock the driver’s door.
(pull is straight up and off) to access the key blade. Its awkward and may need a little practice. That mechanical key can now be used to unlock the driver’s door.
To remove it, push the buttons on either side of the key fob.
It has a push button on the front of the mechanical key itself near the key ring space. Simply push the button and pull the mechanical key away from the IA key.
However, the 2017 Continental and 2020 Aviator bring a very new wrinkle into the mix. The key hole is hidden by a spring-loaded cover and is in a very different location. The key hole has been placed in the chrome molding beneath the driver’s door mirror and behind the imprinted words ‘Continental’ or ‘Aviator’. Simply insert the key and turn to unlock the car. The door will spring open. No word on how well the key hole cover will behave in icy weather.
In addition, the Navigator, updated in 2018, hides the keyhole in plain sight. The door handle is a single piece. The key hole is exposed by simply pulling the driver’s door handle away from the body of the car. It is seen angled outward at the back end of the handle. Insert the mechanical key and turn clockwise. Remove the key and release the handle. The door will open on the next pull. Note that the alarm will sound in a minute or so if the car is not started in time.
Finally, the new Nautilus model hides the key hole under a cap at the back of the driver’s door handle, which must be removed. To do this, insert the key blade into the slot on the bottom of the handle (right image, bottom arrow) and press up. While holding that upward pressure, move the cap rearward to release it. Gently remove the key while doing so. Yes, the effect is that of prying off a piece of your car but its OK and necessary!
saw a brand new model in a parking lot. They are coming from somewhere – Suzuki still sells cars worldwide – and it turned out to be a push button start model. Keyless start versions exist in models sold in North America in the past, so the brand deserves coverage.
There are at least two key fob styles. The fob for older models looks like the one shown above to the right. Turning it over, slide the button found on the back down relative to the image to the right and pull the mechanical key away.
They also have a button on the back. Slide it to the side and pull the mechanical key away.
Early keyless start Suzuki models still use an ignition switch that needs to be turned to operate. A slot for the mechanical key is hidden by the cap shown.
Newer, push button start models work like other models from Japanese manufacturers. Push the start stop button with the key fob while stepping on the brake. The car will recognize the fob, even though the fob’s internal battery is dead and start.