You can replace a Chevy key fob battery yourself in under five minutes
Most Chevy key fobs use a coin-cell battery — typically a CR2032 or CR2025 — that you can buy at any drugstore, grocery store, or gas station for two to five dollars. The fob itself opens with a flat tool (a coin, butter knife, or flathead screwdriver work fine), and the battery slides out and in without any special knowledge. You do not need to visit a dealer or a mechanic.
The exact battery type depends on your fob model and year, but the process is the same: pry the fob open, note which way the old battery sits, drop in the new one the same way, and snap the fob closed. If your fob has not worked in weeks or months, a dead battery is the most common reason, and replacing it usually restores full function.
Key Takeaways
- Chevy key fobs almost always use a CR2032 or CR2025 coin-cell battery, which costs two to five dollars and is sold at drugstores, grocery stores, and gas stations.
- You open the fob by sliding a flat tool (coin, butter knife, or flathead screwdriver) into the seam and gently twisting to separate the two halves.
- The battery sits in a small metal holder and slides out horizontally — note which side faces up before you remove it, then insert the new battery the same way.
- After you close the fob, test it by pressing the lock and unlock buttons from a few feet away from your vehicle to confirm the new battery works.
Identify which battery your fob needs
The easiest way to know which battery to buy is to open the fob and look at the old battery itself. The battery type is printed on the flat side — you will see "CR2032" or "CR2025" or occasionally "CR2016". Write down the number before you leave home, or take a photo of the old battery with your phone.
If you want to know before opening the fob, you can search online for your vehicle's year, make, and model plus "key fob battery" — most Chevy fobs from the last 15 years use CR2032, but some older or specialty fobs differ. When you buy the battery, bring the number with you or show the photo to the store clerk, and they will point you to the right one.
Gather the tools you need
You need only one tool: something flat and thin enough to fit into the seam of the fob. A coin (a penny or dime works best), a butter knife, a flathead screwdriver, or even a plastic spoon handle will do. You are not prying hard — you are just creating enough space to separate the two plastic halves.
Have a small, clean surface nearby where you can lay out the fob and battery. A kitchen counter or table is fine. If the battery is very old and corroded, you may want a paper towel to wipe your fingers, but this is optional.
Open the fob without damaging the plastic
Look at the fob and find the seam that runs around the edge — it is usually a thin line where the front and back halves meet. Slide your flat tool into the seam on one side, then gently twist it like you are opening a paint can. You are not forcing it; if you meet real resistance, try a different spot on the seam.
Once you feel the halves start to separate, work your way around the seam with the tool, twisting gently at each point. The two halves will come apart. Set the front half (the side with the buttons) face-down on your work surface so the battery holder is visible.
Remove the old battery and insert the new one
Inside the fob, you will see a small metal holder with a slot. The old battery sits in this holder, usually with the flat side facing up (the positive side). Slide the old battery out horizontally — it should come free with light pressure from your fingernail or the edge of your tool.
Before you insert the new battery, note which way the old one was facing. Coin-cell batteries have a flat positive side and a slightly domed negative side. Insert the new battery the same way the old one sat, with the flat side facing the same direction. Slide it into the holder until it sits flush. Do not force it; it should slide in smoothly.
Close the fob and test it
Align the two halves of the fob so the seams match up, then press them together firmly until you hear or feel a click. The fob should close completely with no gaps. If it does not close all the way, open it again and check that the battery is seated properly in its holder.
Once the fob is closed, stand a few feet away from your vehicle and press the lock button. You should see the lights flash or hear the locks engage. Press the unlock button and listen for the same response. If both buttons work, the battery replacement is complete. If nothing happens, open the fob again and confirm the battery is facing the correct direction.
What to do if the new battery does not work
If you installed a new battery and the fob still does not work, the battery may be defective (rare but possible), or the fob itself may have a problem. Try a second new battery from a different package or store to rule out a bad battery.
If a second battery does not work, the fob may have water damage, a broken button contact, or a dead circuit board — these are not user-fixable. At that point, you can contact a Chevy dealer for a replacement fob, or buy an aftermarket fob online that is programmed to your vehicle. Many auto parts stores also offer fob programming services if you buy a fob from them.
Frequently Asked Questions
How often do I need to replace the battery?
Most key fob batteries last two to four years with normal use. If you use the fob frequently or leave it in a hot car, the battery may drain faster. You will notice the fob working from shorter distances before it stops working entirely.
Can I use a different battery type if I cannot find the exact one?
No. CR2032, CR2025, and CR2016 are different sizes and voltages. Using the wrong type can damage the fob's circuit board or cause it to malfunction. Always use the exact battery type printed on the old battery or listed in your vehicle's manual.
What if I lose a small piece of plastic when I open the fob?
The fob will still work if a small piece of the plastic casing breaks, but it may not seal as tightly. If the break is large or the fob no longer closes, contact a Chevy dealer about a replacement fob. Aftermarket fobs are also available online.
Do I need to reprogram the 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 fob, it should work when ready without any additional steps.
Can I replace the battery in a smart key or push-button start fob?
Yes, the process is the same. Smart keys and push-button fobs also use coin-cell batteries and open the same way. The battery type may differ (some use CR2032, others use different sizes), so check the old battery before you buy a replacement.