The battery in your Jeep key fob lasts three to four years before it needs replacing

When your Jeep key fob stops locking or unlocking the doors reliably, the battery is almost always the culprit. Replacing it takes about five minutes and costs between $3 and $8 for the battery itself. You do not need to visit a dealership or call a technician—you can do this at home with a coin and the correct replacement battery.

The most common battery type in Jeep fobs is the CR2032, a coin-cell battery about the size of a dime. Some older Jeep models use CR2025 or CR2016 instead. The easiest way to find out which one yours needs is to open the fob and look at the battery that is currently inside, or check your owner's manual.

Key Takeaways

  • Jeep key fobs most commonly use CR2032 batteries, which you can buy at any drugstore, grocery store, or hardware store for $3 to $8.
  • You open the fob by inserting a coin into the slot on the edge and twisting gently—no tools or special equipment needed.
  • The battery slides out easily once the fob is open; note which side faces up before you remove it so you install the new one the same way.
  • After you insert the new battery, snap the fob back together and test the lock and unlock buttons before you put it away.

What battery type your Jeep fob uses

The battery model number is printed on the battery itself. If your fob is still working well enough to open it, you can look at the old battery and read the number directly. If the fob is completely dead, check your owner's manual—most Jeep manuals list the battery type in the key fob section.

If you cannot find the manual, you can also call your Jeep dealership with your vehicle's year and model, and they will tell you the battery type over the phone. Write down the exact model number (CR2032, CR2025, or CR2016) before you go to the store, because the batteries look nearly identical and the wrong size will not fit properly.

Where to buy the replacement battery

CR2032 and similar coin-cell batteries are sold at nearly every pharmacy, grocery store, and hardware store. You will find them in the battery aisle, usually near the AA and AAA batteries. Prices range from $3 to $8 depending on the brand and store. You do not need a name brand—any CR2032 battery will work the same way.

Online retailers like Amazon also sell these batteries, usually in packs of two or four, which can be cheaper per battery if you want spares. If you are in a hurry, a local drugstore or supermarket will have them in stock and ready to take home today.

How to open the key fob safely

Look at the edge of your Jeep key fob for a small slot or seam. Most Jeep fobs have a slot on one of the long sides. Insert a coin—a penny, dime, or quarter works—into the slot and turn it gently, as if you were opening a battery compartment on a toy or remote control. Do not force it; if it does not turn easily, you are probably in the wrong spot.

Once you turn the coin, the fob will begin to separate into two halves. You may hear a small click. Gently pull the two halves apart with your fingers. The battery will be sitting in a small metal or plastic holder inside. Do not lose the small spring or contact piece if one comes loose—you will need to put it back in the same place.

Removing and replacing the battery

Before you take the old battery out, note which side is facing up. The side with the + symbol should face up in most Jeep fobs, but check your old battery to be sure. Gently slide or pop the old battery out of its holder. If it is stuck, use your fingernail or the edge of the coin to nudge it loose.

Slide the new battery into the holder with the + side facing the same direction as the old one was. The battery should sit flat and not stick up above the edge of the holder. If it feels loose or does not sit flat, you may have the wrong battery size—check the model number again.

Closing the fob and testing it

Align the two halves of the fob so the seam is even on all sides. Press them together firmly until you hear or feel a click. The fob should snap shut completely with no gaps. If it does not close all the way, you may have put the battery in upside down or the spring came loose—open it again and check.

Once the fob is closed, stand near your Jeep and press the lock button. You should hear the doors lock and see the lights flash. Press the unlock button and listen for the doors to unlock. If both buttons work, the battery is installed correctly. If nothing happens, open the fob again and check that the battery is facing the right direction and sitting flat in the holder.

When to call a dealership instead

If you replace the battery and the fob still does not work, the problem is not the battery. The fob may have water damage, a broken button, or a dead circuit board. In that case, you will need to contact your Jeep dealership to order a replacement fob. They can program a new one to your vehicle, which usually takes a few days.

If your fob works for the lock and unlock buttons but the trunk release or panic button does not work, one of those buttons may be stuck or broken. You can still use the fob for locking and unlocking, but you will need a replacement fob if you want those other functions back.

Frequently Asked Questions

How long does a Jeep key fob battery last?

Most CR2032 batteries last three to four years in a key fob, depending on how often you use it. If you press the buttons many times a day, the battery may wear out sooner. If you use the fob only occasionally, it may last longer.

Can I use a different battery size if I cannot find the right one?

No. A CR2025 will not fit in a slot made for a CR2032, and using the wrong size can damage the fob or cause it to stop working. Always use the exact battery type your fob needs. If your store does not have it in stock, order it online or try another store.

What do I do if I drop the spring or contact piece inside the fob?

If a small metal spring falls out, look for it inside the fob before you close it. It usually sits on top of or under the battery. If you cannot find it, the fob will not work until you put it back. If you lose it completely, you will need a replacement fob from the dealership.

Will replacing the battery erase my fob's programming?

No. Changing the battery does not erase the code that pairs your fob to your Jeep. Your fob will work exactly as it did before, as long as the new battery is installed correctly.

Can I replace the battery myself or do I need a technician?

You can replace it yourself. The process takes about five minutes and requires only a coin. You do not need any special tools or technical knowledge. If you are uncomfortable opening the fob, a dealership or locksmith can do it for you, but the cost will be higher than doing it at home.