Open the key fob case to access the battery
Most Chevy key fobs split into two halves along a seam that runs around the edge. Look for a small slot or notch on one side of the fob — this is where you insert a flat tool to pry the case open. A flathead screwdriver, a coin, or a plastic pry tool all work. Insert the tool gently into the slot and twist slightly to separate the two halves.
Once the case is open, you will see the battery sitting in a plastic holder. The battery is usually a coin-cell type, most commonly a CR2032, CR2025, or CR2016. The number printed on the battery itself tells you the exact size. Take note of which side faces up — the positive side (marked with a +) should face toward you when you look at the open fob.
If your fob does not have a visible slot, check the edges and back carefully. Some Chevy fobs have a small button or release mechanism on the back that you press while gently pulling the halves apart. If you cannot find an obvious opening point, consult your vehicle's owner manual — the exact method varies by model year.
Key Takeaways
- Chevy key fobs typically use a CR2032, CR2025, or CR2016 coin-cell battery, and the number is printed directly on the old battery.
- Most fobs open by inserting a flathead screwdriver or coin into a slot on the edge and gently twisting to separate the two halves.
- When you install the new battery, the positive side (marked +) must face upward toward the circuit board inside the fob.
- Replacement batteries cost between $3 and $8 at most drugstores, grocery stores, and hardware retailers.
- After closing the fob, test all buttons to confirm the fob works before you rely on it.
Remove the old battery and note its orientation
Once the case is open, gently lift the old battery out of its holder. If it is stuck, a small plastic lever or tab may be holding it in place — lift that tab first. Do not force the battery out, as you could damage the plastic holder underneath.
Before you set the old battery down, look at how it sits in the holder. The positive side (the flat side marked with a +) should be facing up toward the circuit board. This orientation matters — your new battery must go in the same way. If you are unsure which side is positive, the old battery will show you.
Insert the new battery with the positive side facing up
Take your new battery and place it into the holder with the positive side facing up, exactly as the old one was positioned. The battery should sit flat and find in the plastic holder without any wobbling. If the holder has a small metal tab or spring, make sure the battery sits under it properly.
Do not force the battery into place. It should slide in smoothly and sit flush with the holder. If it does not fit easily, double-check that you have the correct battery size — a CR2032 will not fit in a space designed for a CR2025.
Close the fob case and test all buttons
Align the two halves of the fob so the seam matches up evenly on all sides. Press them together firmly until you hear or feel a click. The fob should close completely with no gaps. If one side is higher than the other, open it again and make sure the battery is sitting flat in its holder.
Once the case is closed, press each button on the fob — lock, unlock, and panic if your model has one. You should see the red light on the fob blink when you press a button. If nothing happens, open the fob again and check that the battery is positioned correctly with the positive side facing up.
Where to buy replacement batteries
Coin-cell batteries like the CR2032 are sold at most drugstores, grocery stores, hardware retailers, and big-box stores. CVS, Walgreens, Target, Walmart, and Home Depot all stock them in the watch and battery section. You can also order them online from Amazon or other retailers.
Batteries typically cost between $3 and $8 each, though buying a multi-pack is often cheaper per battery if you have multiple fobs or devices. Some retailers, including Batteries Plus and Best Buy, will install the battery for you at no charge if you purchase it there — useful if you are uncomfortable opening the fob yourself.
What to do if the fob still does not work after replacing the battery
If the fob does not respond after you have installed a new battery and closed the case, the battery may not be making proper contact with the circuit board. Open the fob again and check that the battery is sitting completely flat and centered in the holder. If the holder looks cracked or damaged, the fob may need replacement rather than just a new battery.
If the battery is positioned correctly and the fob still does not work, the circuit board itself may be damaged — this can happen if the fob was dropped, exposed to water, or sat in a hot car for extended periods. In that case, you will need a replacement fob from a Chevy dealer or a third-party automotive locksmith. A dealer can program a new fob to your vehicle, though the cost is usually $150 to $300 depending on the model year.
Frequently Asked Questions
What size battery does a Chevy key fob use?
Most Chevy fobs use a CR2032, CR2025, or CR2016 coin-cell battery. The exact size is printed on the battery itself. If you have lost the old battery, check your vehicle's owner manual or call a Chevy dealer with your vehicle's year and model — they can tell you the correct size in seconds.
Can I use a different brand of battery?
Yes. Duracell, Energizer, Panasonic, and store brands all make CR2032 and similar batteries that work identically in a key fob. The brand does not matter — only the size and type. Buy whatever is cheapest or most convenient.
How long does a key fob battery last?
A coin-cell battery in a key fob typically lasts three to four years under normal use. If you use the fob frequently, the battery may drain faster. If you rarely use it, it may last longer. When the battery starts to die, the fob will respond more slowly or require you to press buttons multiple times.
Is it safe to replace the battery myself?
Yes, replacing a key fob battery is safe and requires no special tools or knowledge. The battery is not dangerous to handle, and you cannot damage the fob by opening it as long as you do not force the case apart or drop the circuit board. If you are uncomfortable doing it, a locksmith or dealer can do it for $10 to $25.
What should I do with the old battery?
Coin-cell batteries can be recycled. Most retailers that sell batteries also accept old batteries for recycling at no charge — ask at the customer service desk. You can also find a local recycling center through Earth911.com or your city's waste management website. Do not throw batteries in the trash.