You can replace a Chevy key fob battery yourself in about five minutes with no tools
Most Chevy key fobs use a coin-cell battery — usually a CR2032 or CR2025 — that you can swap out at home without taking the fob apart or visiting a dealer. The battery costs between $3 and $8 at any pharmacy, grocery store, or hardware store. You'll need to open the fob case, which Chevy designs to split along a seam, and then slide the old battery out and the new one in. The whole job takes longer to read about than to do.
The exact steps depend slightly on which Chevy model and fob generation you have, but the principle is the same across nearly all of them. If your fob is cracked, won't open, or the battery swap doesn't restore the buttons, that's when you call a dealer or locksmith — but most of the time, a fresh battery is all you need.
Key Takeaways
- Chevy key fobs use replaceable coin-cell batteries, most commonly CR2032 or CR2025, that cost $3 to $8 and are sold at pharmacies and hardware stores.
- The fob case splits along a seam and opens by hand or with gentle prying; you do not need to disassemble anything or use special tools.
- Slide the old battery out, note which side was facing up, and slide the new battery in the same way.
- If the fob still does not work after a new battery, the problem is likely a broken button contact or circuit board, which requires a dealer or locksmith.
What battery your Chevy key fob uses
Chevy key fobs from the last 15 years almost always use a CR2032 or CR2025 coin-cell battery. The CR2032 is slightly thicker and holds a bit more charge; the CR2025 is thinner. Both are 20 millimeters in diameter. You can find the exact battery type printed on the old battery itself once you open the fob, or you can check your owner's manual — though many owners find it faster to just buy a CR2032, which works in most Chevy fobs.
These batteries are not rechargeable. A fresh one typically lasts three to four years depending on how often you use the fob. When the battery is low, the buttons will work only at very close range, or not at all. Some newer Chevy fobs have a low-battery warning light on the dashboard, but most do not.
How to open your Chevy key fob
Look at the edge of your fob for a small seam or slot running around the perimeter. This is where the two halves of the case meet. On most Chevy fobs, you can open it by hand: grip one half firmly and use your thumbnail or fingernail to pry gently at the seam until the case splits. If your fob is tight, a flat-head screwdriver or a coin can help, but do not force it — the plastic cracks easily.
Once the case opens, you'll see the battery sitting in a small metal holder or clip. The battery is round and flat, about the size of a dime. Do not lose the small rubber gasket or any springs if your fob has them; these keep water out and help the buttons work. Set them aside on a clean surface.
Removing the old battery and installing the new one
Note which side of the battery is facing up — this matters. The side marked with a + (positive terminal) should face up in most Chevy fobs. Gently slide or pry the old battery out of its holder. If it's stuck, a plastic spoon or the edge of a credit card can help you lift it without scratching the circuit board.
Take your new battery and slide it into the holder with the + side facing the same direction as the old one was. It should sit flat and snug. Do not force it; if it doesn't slide in easily, you may have the polarity backwards — flip it and try again. Once it's seated, you're done with the battery part of the job.
Closing the fob and testing the buttons
Before you close the case, make sure any rubber gasket or spring is back in place. Then align the two halves of the case and press them together firmly until you hear or feel a click. The seam should be tight and even all the way around. If there's a gap, open it again and check that nothing is pinched inside.
Stand a few feet away from your car and press each button on the fob — lock, unlock, panic, trunk, or whatever buttons yours has. The car should respond when ready. If a button doesn't work, open the fob again, check that the battery is seated properly and the polarity is correct, and close it again. If the buttons still don't respond after a second battery swap, the problem is likely inside the fob itself, and you'll need a dealer or locksmith to repair or replace it.
Where to buy a replacement battery
CR2032 and CR2025 batteries are sold at nearly every pharmacy, grocery store, and hardware store. You'll find them in the photo section, the watch battery section, or near the checkout counter. A single battery costs $3 to $8 depending on the brand. You can also order them online, but the shipping time usually makes that slower than a quick trip to a local store.
Buy a name-brand battery if you can — Energizer, Duracell, Panasonic, and Maxell are all reliable. Generic batteries work too, but they sometimes have shorter shelf lives or lower capacity. Since you're only buying one, the extra dollar or two for a known brand is worth it.
When to call a professional instead
If your fob case is cracked, won't open, or opens but the battery holder is damaged, a dealer or locksmith can replace the entire fob or repair the case. If the buttons don't work after you've installed a fresh battery and checked the polarity, the circuit board or button contacts inside are likely worn out or broken. A dealer can reprogram a new fob to your car, which usually takes 15 minutes and costs $150 to $300 depending on the model year. A locksmith may charge less, but call ahead to confirm they work on your Chevy model.
If your car won't respond to any button on the fob even with a new battery, and the fob is less than five years old, it's worth having a dealer test it before you buy a replacement — sometimes the problem is the car's receiver, not the fob.
Frequently Asked Questions
Can I use a different battery size if I can't find a CR2032?
Not safely. A CR2025 is thinner and may work in some fobs, but it can rattle inside the holder and lose contact. A CR2016 is too thin. Stick with CR2032 or check your manual for the exact size. Most stores stock CR2032 year-round, so you should be able to find one without substituting.
What if I put the battery in backwards?
The fob straightforward won't work — the buttons will be dead. The battery won't be damaged. Open the fob, flip the battery so the + side faces up, and close it again. This is the most common mistake and the easiest to fix.
How long does a new battery last?
A fresh CR2032 or CR2025 typically lasts three to four years in a Chevy key fob, depending on how often you use it. Heavy users may need a replacement sooner. When the battery gets low, you'll notice the buttons only work at very close range.
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 close the case, the fob should work when ready without any reprogramming steps.
Is it safe to open my key fob myself?
Yes. The case is designed to open by hand or with gentle prying. You're not disassembling anything or voiding a warranty — Chevy expects owners to change the battery themselves. Just be gentle with the plastic and don't lose any small parts inside.