You can change a Chevy key fob battery yourself in under five minutes
Most Chevy key fobs use a coin-cell battery—usually a CR2032 or CR2025—that you can swap out without tools or a trip to the dealer. The battery typically lasts three to four years depending on how often you use the fob. When your fob stops locking or unlocking the car reliably, or the buttons feel sluggish, a dead battery is usually the culprit.
The process is straightforward: you pry open the fob case, remove the old battery, and snap in a new one. You do not need to reprogram anything afterward. The whole job takes longer to read about than to do.
Key Takeaways
- Chevy key fobs use CR2032 or CR2025 coin-cell batteries that cost $3 to $8 and are sold at any pharmacy, grocery store, or hardware store.
- You open the fob by sliding a flat tool into the seam between the two plastic halves and gently twisting to separate them.
- The battery sits in a small metal holder and lifts straight out; note which side faces up before you remove it.
- After inserting the new battery with the same side facing up, press the fob halves together until they click, and test the buttons.
- If the fob still does not work after a fresh battery, the problem is likely the circuit board or buttons, not the power source.
What battery your Chevy key fob needs
The vast majority of Chevy key fobs use a CR2032 battery. Some older models or specialty fobs may use a CR2025, which is slightly thinner but the same diameter. Both are coin-cell batteries about the size of a dime and are available everywhere—drugstores, grocery stores, dollar stores, hardware stores, and online. A single battery costs between $3 and $8.
If you are not sure which type your fob needs, check the battery holder inside the fob itself. The size is printed on the metal holder. You can also look in your owner's manual or call your Chevy dealer with your vehicle identification number (VIN), and they will tell you in one call.
Buy a fresh battery before you open the fob. Do not reuse an old battery from another device—coin cells lose charge gradually, and a weak battery will give you the same sluggish performance you are trying to fix.
How to open the key fob case
Look at the seam running around the edge of your fob where the two plastic halves meet. You will see a thin gap. Slide a flat tool—a flathead screwdriver, a coin, or a plastic pry tool—into that gap on the side opposite the key ring. Do not force it; the fob is designed to separate with gentle pressure.
Once the tool is seated in the gap, twist it slightly to create a small opening. Then work your way around the seam, explore gentle pressure at different points until the two halves separate. The fob will come apart into a front and back shell, and you will see the battery holder in the middle.
If the fob resists, you are likely pushing too hard. Stop, reposition your tool, and try again with less force. Plastic fobs crack easily, and a cracked case is harder to close properly afterward.
Removing and replacing the battery
The battery sits in a small metal or plastic holder with two contact points. Before you touch it, note which side is facing up—the side with the + symbol should be visible. Gently lift the battery straight out of the holder. It may take a tiny bit of wiggling, but it should come free without resistance.
Place the new battery into the holder with the same side facing up as the old one. The + side almost always faces up in a Chevy fob, but checking the old battery ensures you get it right. Press down gently until you hear or feel a small click; the battery should sit flat and not rock.
Do not force the battery into the holder. If it does not sit flush, you may have it upside down. Flip it and try again. Once it is seated, the metal contacts should touch both the top and bottom of the battery.
Closing the fob and testing it
Align the two plastic halves so the seams match up evenly. Press them together firmly until you hear a click or feel them snap into place. The fob should be solid and not flex or rattle when you squeeze it gently. If there is a gap or the halves do not align, open it again and check that the battery holder is not blocking the closure.
Test the buttons right away. Press the lock and unlock buttons a few times from different distances—start close to the car and move back. The fob should respond when ready with no lag. If it works, you are done. If the buttons still feel sluggish or do not work at all, the battery was not the problem.
What to do if the fob still does not work
A new battery fixes most key fob problems, but not all. If your fob still does not work after you have installed a fresh battery and closed the case properly, the issue is likely inside the fob itself—either the circuit board is damaged, the buttons are worn out, or the contacts are corroded.
At this point, you have two options: take the fob to a Chevy dealer, who can test it and replace it if needed (usually $200 to $400 for a new fob), or buy an aftermarket replacement fob online for $30 to $100 and have a dealer or locksmith program it to your car. Some aftermarket fobs come pre-programmed and work when ready; others require a few minutes of setup at the dealer.
If only one button is not working—say, the trunk release—the problem is almost certainly that button's contact pad, and the fob cannot be repaired cheaply. Replacement is the practical choice.
Preventing battery drain and extending fob life
Key fob batteries drain faster if you use the fob heavily or if you leave it in a hot car for long periods. Heat speeds up battery discharge. Store your fob in a cool, dry place when you are not using it, and avoid dropping it or exposing it to water, which can corrode the circuit board and contacts.
If your fob gets wet, open it when ready, dry all the parts with a soft cloth, and let them air-dry for at least 24 hours before reassembling. Do not use heat like a hair dryer, which can damage the plastic and circuit board.
Most Chevy key fobs last three to four years on a single battery with normal use. If you find yourself replacing the battery more often than that, the fob may have a parasitic drain—a small electrical fault that is slowly draining power even when you are not using it. A dealer can diagnose this, but replacement is usually the only fix.
Frequently Asked Questions
Can I use a different battery size if I cannot find a CR2032?
No. A CR2025 is slightly thinner and may work in some Chevy fobs, but a CR2016 or any other size will not fit the holder properly or make good contact. Stick with the size printed on the battery holder inside your fob. If your local stores do not have it, order online—it will arrive in one or two days.
Do I need to reprogram my key fob after changing the battery?
No. Changing the battery does not erase any programming. Your fob will work exactly as it did before, with no setup required. If you had to reprogram it, the original problem was not the battery.
What if I put the battery in upside down?
The fob will not work, but you have not damaged anything. Open it again, flip the battery so the + side faces up, and close it. The fob will work when ready. Coin-cell batteries are not harmed by being installed backward for a few seconds.
How do I know if the battery is actually dead or if something else is wrong?
Install a fresh battery and test all the buttons. If none of them work, the battery was likely the problem. If some buttons work and others do not, or if the fob only works from very close to the car, the circuit board or buttons are probably damaged, not the battery.
Can I buy a universal key fob instead of replacing the Chevy one?
Yes, but it will need to be programmed to your car by a dealer or locksmith. Some universal fobs come pre-programmed for certain Chevy models and work when ready. Check the product listing to see if it covers your year and model before you buy.