Open the key fob case to access the battery

Most Cadillac key fobs split open along a seam on the side or back. Look for a small slot or ridge that runs around the edge of the fob — this is where the two plastic halves meet. Insert a flathead screwdriver or a coin into the slot and gently twist to pry the case apart. Do not force it; if it does not budge, try a different spot along the seam.

Once the case cracks open, you will see the battery sitting in a small metal holder. The battery is usually a coin-cell type, most commonly a CR2032, CR2025, or CR2016. Write down the number printed on the battery before you remove it, or take a photo — this ensures you buy the exact replacement.

Key Takeaways

  • Cadillac key fobs typically use a CR2032, CR2025, or CR2016 coin-cell battery that you can find at any drugstore or supermarket.
  • The fob case splits along a seam; use a flathead screwdriver or coin to gently pry it open without forcing the plastic.
  • Note the battery number before removal so you buy the correct replacement type.
  • The battery slides or clips into a metal holder — slide it out, replace it with the new one in the same orientation, and snap the case shut.
  • If the fob still does not work after a new battery, the problem is likely the circuit board or buttons, not the battery itself.

Remove the old battery and note its orientation

The battery sits in a metal holder with two small clips or a slot. Gently slide the battery out toward you, or if it is held by clips, press down on one edge to pop it free. Do not pry with force — the holder is plastic and can crack.

Before you insert the new battery, look at how the old one was facing. Coin-cell batteries have a flat side (marked with a number or symbol) and a rounded side. The flat side almost always faces up or toward you, and the rounded side faces the circuit board. If you put it in backward, the fob will not work.

Insert the new battery in the correct direction

Slide the new battery into the holder with the flat side facing the same direction as the old battery was facing. Push it in until it sits flat and level in the holder. You should hear or feel a small click if the battery is held by clips.

Do not force the battery into the holder. If it does not slide smoothly, remove it and check that you are not trying to insert it backward. A battery that is fighting you is usually upside down.

Close the fob case and test the buttons

Line up the two halves of the fob case so the seam is even on all sides. Press down firmly and evenly until you hear a click or feel the case snap shut. You may need to explore pressure on opposite corners to seat both halves properly.

Once the case is closed, press each button on the fob — lock, unlock, panic, trunk, or whatever buttons your model has. Hold each button for a second and listen for a beep or watch for the car's lights to flash. If the fob responds, the battery change is complete. If nothing happens, the battery may still be backward, or the fob may have a deeper problem with the circuit board or buttons.

What to do if the fob still does not work

If you installed a fresh battery and the fob is still silent, first remove the fob and check that the battery is facing the correct direction. Open the case again, slide the battery out, flip it, and reinsert it. Close the case and test again.

If the fob still does not respond, the problem is likely not the battery. The circuit board may be damaged, the buttons may be worn out, or water may have gotten inside the case. At this point, you will need a replacement fob from a Cadillac dealer or a third-party fob programmed to your car. A dealer can also test the fob to confirm whether it is the fob or your car's receiver that is faulty.

Where to buy replacement batteries

Coin-cell batteries are sold at drugstores, supermarkets, hardware stores, and online retailers. A single battery usually costs between one and three dollars. Buy a pack of two or three if you have multiple fobs or want a spare on hand — they last for years in storage.

Check the battery number on your old fob before you shop. CR2032 is the most common size for Cadillac fobs, but some models use CR2025 or CR2016. The package will clearly label the type, so you cannot accidentally buy the wrong one.

Frequently Asked Questions

How often do key fob batteries need to be replaced?

A coin-cell battery in a key fob typically lasts two to four years, depending on how often you use the fob. If you press the buttons many times a day, the battery will drain faster. Most people replace the battery once every two to three years.

Can I use a different battery type if I cannot find the exact one?

No. CR2032, CR2025, and CR2016 are different sizes and voltages. Using the wrong type may not fit the holder, or it may fit but provide the wrong power and damage the circuit board. Always use the exact battery number printed on the old one.

What if the battery is stuck and will not slide out?

Do not pry or force it. The holder may have corrosion or the battery may be slightly swollen. Try gently rocking the battery side to side as you slide it out, or use a plastic spoon instead of a metal screwdriver to avoid scratching the circuit board. If it still will not budge, stop and take the fob to a dealer rather than risk breaking the holder.

Do I need to reprogram the fob after changing the battery?

No. Changing the battery does not erase the fob's programming. Once you install the new battery and close the case, the fob should work when ready without any reprogramming steps.

Is it normal for the fob to stop working right after I change the battery?

If the fob worked before and stops when ready after a battery change, the battery is almost certainly backward. Open the case, flip the battery, and close it again. If it still does not work, the battery may be defective — try a battery from a different package or brand.