Open the key fob by prying the two halves apart

Most Chevy key fobs split into two plastic halves held together by a small slot or seam. Look for a thin line running around the edge of the fob — that is where the two pieces meet. Insert a flathead screwdriver or a coin into the slot and gently twist to separate them. You do not need force; a light twist is enough to pop them apart.

If your fob has a removable key ring, take that off first so you have a clear grip. Once the halves are separated, set one half aside and keep the other in front of you. The battery sits in a small metal holder in the center of the plastic case.

Note the battery type and remove the old one

Chevy key fobs typically use a CR2032 battery, which is a flat, coin-shaped cell about the size of a dime. Before you remove it, look at which side is facing up — the positive side (marked with a + symbol) should be facing toward you. This matters when you install the new battery.

Gently pry the old battery out of its metal holder using a plastic tool or the edge of a coin. Avoid using a metal screwdriver directly on the battery, as this can damage the fob's circuit board. Once the old battery is out, set it aside. Do not throw it in the trash — most pharmacies and electronics stores accept used batteries for recycling.

Key Takeaways

  • Chevy key fobs split at a seam around the edge; use a flathead screwdriver or coin to gently twist the two halves apart.
  • Most Chevy fobs use a CR2032 battery, which you can buy at any drugstore, grocery store, or hardware store for two to five dollars.
  • When you insert the new battery, the positive side (marked with a +) must face toward you, the same direction the old one was facing.
  • After reassembling the fob, test all buttons before you leave the store or put the fob back in your pocket.

Insert the new battery with the positive side facing up

Buy a fresh CR2032 battery from a pharmacy, grocery store, or hardware store. When you are ready to install it, hold the battery so the positive side (the side with the + symbol) faces up toward you. This matches the direction the old battery was facing.

Place the new battery into the metal holder in the fob. It should sit flat and snug. If it feels loose or tilted, remove it and try again — the battery needs to make solid contact with the metal contacts inside the holder for the fob to work.

Snap the two halves back together

Align the two plastic halves so the seam lines up evenly all the way around. Press them together firmly until you hear or feel a click. The fob should be solid and not flex when you squeeze it gently. If there is a gap or the halves feel loose, pop them apart again and check that the battery is sitting flat and centered in its holder.

Once the fob is sealed, reattach the key ring if your fob has one. The reassembly is complete.

Test the buttons before you put the fob away

Press each button on the fob — lock, unlock, and trunk (if your fob has one) — and watch your Chevy to confirm the lights flash or the doors respond. If nothing happens, the battery may not be making contact. Pop the fob open again, remove the battery, and reseat it firmly in the holder. Make sure the positive side is still facing up.

If the buttons still do not work after reseating the battery, the battery itself may be defective. Try a different CR2032 from a different package or store. Occasionally a battery comes out of the box dead, especially if it has been sitting on a shelf for a long time.

What to do if the fob still does not work

If a fresh battery and proper seating do not fix the problem, the circuit board inside the fob may be damaged. Water damage is the most common cause — if the fob has been dropped in water or exposed to heavy moisture, the internal contacts may have corroded. In that case, the fob itself needs to be replaced, not just the battery.

You can order a replacement fob online or buy one from a Chevy dealer. Some aftermarket fobs are cheaper than dealer fobs and work just as well, but check the reviews for your specific model year first. If you go to a dealer, bring your vehicle identification number (VIN) so they order the correct fob for your Chevy.

Frequently Asked Questions

Where can I buy a CR2032 battery?

CR2032 batteries are sold at pharmacies (CVS, Walgreens), grocery stores, hardware stores (Home Depot, Lowe's), and online retailers. They cost between two and five dollars. Buy one or two extras so you have a backup when the next one dies.

Can I use a different battery size if I do not have a CR2032?

No. Other battery sizes will not fit the holder or will not make proper contact with the circuit board. Always use a CR2032 for a Chevy key fob. If your store is out of stock, order one online or go to a different store rather than trying a substitute.

How long does a key fob battery last?

A CR2032 battery in a key fob typically lasts three to four years, depending on how often you use the fob. If you use your fob multiple times a day, the battery may wear out sooner. If you rarely use it, it may last longer.

What if I drop the battery and it rolls away?

CR2032 batteries are small and straightforward to lose. Keep the old battery in your hand or set it in a small cup while you work. If it rolls away, do not panic — just buy a new one. They are inexpensive, and you will need a fresh one anyway.

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

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