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How to Open a Cadillac with a Dead Key Fob
Getting into Your Cadillac
- 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
Cadillac vehicles use three key 
fob (remote control or ‘clicker’) styles, and two (GM Styles 1 and 3) have mechanical keys embedded inside. That key will be used to unlock the driver’s door or the trunk (yes, the trunk) and in some cases to remove a piece of the car!
If your vehicle is the XLR Coupe, a mechanical key is provided separately. Be sure to keep it around!
For Style 1 (above right), press the thin button near the bottom of the transmitter (remote control or ‘clicker’) used to remove the mechanical key. Do not pull the mechanical key out without pressing the button.
The Style 3 key fob is similar to Style 1, in that the mechanical key is removed from the fob for use getting into the vehicle. To remove the mechanical key, press the button on the side of the transmitter near the key ring, as shown, and pull out the key.
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.
Getting Inside
CT4, CT6, CTS, XT4, XT5, XT6, XTS, ATS
Many GM models hide the key holes under a cap at the back of the driver’s door. They include the Cadillac CT4, CT6, CTS, XT4, XT5, XT6, XTS and ATS.
*Note the additional Escalade instructions below and that 2020 brings a completely new cap, also below.
To remove the first 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.
Escalade
The Escalade, until 2017, features a new wrinkle in the hidden 
key hole. The cylinder is hidden in the same place and manner, but the cap is the top, 1/8 of an inch portion. To remove it, the door handle must be pulled fully open. Then, push the cap towards the handle to release it. It may take a bit of force to accomplish this. See two videos here.
XTS extra
IMPORTANT! The Cadillac XTS uses both types of caps to hide the key holes shown above. Look or feel for a slot as described with the first cap. If its there, follow the first instructions. If there is no slot, follow the instructions for the early Escalade.
Replacing it is a simple matter of reversing the removal process and simpler than the process needed for the old style.
Escalade, CT5
In the middle of the 2017 model year, the Escalade, while retaining the hidden key hole, was shifted to the method shown previously. So, starting in 2017, look for a slot beneath the cap. If its there, use the key as described above. Push it into the slot as far upwards as possible, then pry outward. Move the cap rearward revealing the key cylinder.
Then in 2020, Cadillac came up with a whole new cap. As with the first style, there is a slot beneath the cap (right). The handle is first identified by its more curved appearance front to back and a separation near the top. Only the bottom can be removed. It is found on the Escalade and CT5.
Insert the mechanical key into the slot at the bottom of the handle and push upward all the way until the 
cover frees. It will pop out about 1/8 of an inch. Remove the key – do not pry or pull with it. Once free, the cap simply swings up and can be pulled away (right).
With all these options the mechanical key can be used in the now-exposed lock cylinder. We have a video here as well to help.
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!
CTS, XLR, ELR
The CTS, XLR and ELR Coupes have flush door handles (left image) with no key holes
at all. They have a very different trick up their sleeves.
You must use the mechanical key to open the trunk. The key hole is under the lip of the trunk lid facing the ground.
Once open, you will find a release handle. It is below the forward lip of the trunk (right). Pulling the door release lever will unlock as well as unlatch the driver’s door.
We have two videos for coupes here.
Lyriq
Similarly but more simply, the new Lyriq EV also requires the trunk or liftgate be unlocked using the mechanical key (right image). The front door will unlock at the same time.
Note that if the key simply spins in the cylinder, make sure that the key is fully inserted.
Related: Getting Out!
Continue to Starting Instructions …
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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
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.
With the flip key key fob, the mechanical key remains attached to the fob, but several back-up locations are used. In the Buick Verano, Regal (through 2017) and pre-2014 LaCrosse, remove the cup holder from the center console in front of the storage area. This may be the entire cup holder assembly (above right), or simply a cup holder insert (below right).
Look for a notch at the top rear of the cup holders to insert a finger or tool to aide removal. Then place the transmitter in the transmitter pocket with the buttons facing up. The pocket will be shaped somewhat like the key fob.
The back up location is changed in the Regal beginning with the 2018 model year, and the car uses a newer key fob. The spot is in a narrow compartment at the front of the center console, as can be seen in the image at right. And for the first time in any GM vehicle, the spot is marked. There is an image of a padlock with lines radiating from it, meant to invoke radio waves.
For the LaCrosse in 2014 and later, the transmitter pocket is moved into the storage area inside the armrest near the auxiliary power, USB and audio ports (right). Place the transmitter in the pocket.
The newest key style was introduced in 2014. It features a removable key. Note that there are still some flip keys in use. The Buick Encore, with exception, and Envision, until 2021, crossovers will use this spot. Simply drop the key fob into the front cup holder with the buttons up, and start the car as normal. Check out videos for these models 
The exception is the Encore GX, beginning with the 2020 model. There is a small depression at the rear of a tray on the center console that is just in front of the center console storage area. This is the back up spot. The new Envista model introduced in 2024 uses this spot as well. Drop the key fob onto this spot with the buttons up and start the car as normal, again pressing the Start / Stop button while stepping on the brake.
And the 2021 Envision finds the back up spot moved to the front of the center console storage area, See the image to the right. Inside and at the front of the console there is a small, flat depression. Drop the key fob onto this spot with the buttons facing up and start the vehicle as normal, stepping on the brake while pushing the Start / Stop button. See a helpful 
Finally, the Buick Enclave gets keyless start for the first time in 2018. The back up spot is beneath the rubber mat at the bottom of the center console. Remove the mat and place the transmitter on the fob-shaped depression that is now visible. As always, with the vehicle in Park or Neutral, press the brake pedal and the Start / Stop ignition button as normal. We’ll post more information as it comes available.
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.
Buick uses the last two of GM’s three key fob (remote control or ‘clicker’) styles. Style 2 is a flip key, shown to the right. Simply press the unmarked chrome button to extend the mechanical key. It remains attached to the key fob.
Envista
the oval cap that can accept the key (right). Insert the key into the spot and press the key inward. This will allow the cap to move. Move it towards the rear and remove it. The key hole is now visible and the door can be unlocked.