What you need to know before you start
Most Chevy key fobs use a coin-cell battery — usually a CR2032 or CR2025 — that you can replace yourself in about two minutes 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 almost always the reason.
The exact battery type and how the fob opens depends on your Chevy model year and fob design. Some fobs slide open; others have a small slot where you pry with a coin or flathead screwdriver. Once you know which type you have, the replacement takes longer to find the battery at a store than to swap it in.
Key Takeaways
- Chevy key fobs typically use CR2032 or CR2025 coin-cell batteries that cost $3 to $8 and are sold at drugstores, grocery stores, and hardware retailers.
- You can open most Chevy fobs by sliding the case apart or using a coin to pry along a seam — check your owner's manual or fob itself for the correct method.
- When you replace the battery, note which side faces outward (usually the positive side marked with a + symbol) so you install the new one the same way.
- If the fob still does not work after a new battery, the problem may be a worn button contact or internal damage, and a dealer replacement may be necessary.
Finding the right battery for your Chevy fob
The battery type is printed on the back of your current battery or listed in your owner's manual. CR2032 is the most common size across Chevy models, but some older or specialty fobs use CR2025 or CR2016. All three are coin-shaped, about the size of a dime, and cost between $3 and $8 for a single battery or a pack of two.
You can buy these batteries at any pharmacy (CVS, Walgreens), grocery store, Walmart, Target, or hardware store. They are usually in the watch and battery section near the checkout. If you are unsure which type your fob needs, bring the fob with you or take a photo of the battery compartment to show a store employee.
How to open your Chevy key fob
There are two common designs. The first has a seam running around the edge of the fob — you slide the two halves apart by pushing on the side marked "PUSH" or by gently prying with a coin or flathead screwdriver along the seam. Start at one corner and work your way around; the halves will separate without force.
The second design has a small slot on the side or back of the fob. Insert a coin (a penny or dime works) into the slot and turn it gently, as if opening a battery compartment on a remote control. The slot is usually marked with an arrow showing which direction to turn. Once you feel it give, you can lift the battery out by hand or with the coin.
If your fob does not match either description, check the owner's manual for your specific model year — Chevy has used several designs over the years. A quick search for "Chevy [your model] key fob battery replacement" will also show you a photo of your exact fob and the correct opening method.
Removing and replacing the battery
Once the fob is open, you will see the battery sitting in a small metal holder or slot. Note which side is facing up — the positive side (marked with a + symbol) should be facing outward toward you. Gently lift or pry the old battery out with your fingernail or the edge of a coin.
Before you install the new battery, check that the + side faces the same direction as the old one did. Slide or drop the new battery into the holder with the + side facing outward. The battery should sit flat and snug; if it feels loose, you may have installed it upside down. Close the fob by sliding the halves together or turning the slot back into place until you hear or feel it click.
Test the fob by pressing each button — lock, unlock, and trunk — from a few feet away from your car. If the car responds, the replacement worked. If nothing happens, open the fob again and check that the battery is installed with the + side facing the correct direction.
What to do if the new battery does not work
If the fob still does not respond after you have installed a fresh battery the correct way, the problem is likely inside the fob itself. The rubber button contacts can wear out over time, or the circuit board may have corroded or been damaged. These parts cannot be replaced at home.
At this point, you have two options. You can take the fob to a Chevy dealership and ask for a replacement fob — the cost varies by model but typically ranges from $150 to $400 depending on whether the fob has remote start or other features. Some dealerships will program a used fob from a salvage yard for less. Alternatively, you can buy an aftermarket fob online and have a locksmith or dealership program it to your car, which may cost less than a dealer fob.
Preventing premature battery drain
Key fob batteries last longer when you avoid exposing the fob to extreme heat, cold, or moisture. Do not leave it in a hot car, drop it in water, or store it in a damp place. If your fob gets wet, open it and let the battery and contacts dry completely before closing it again.
Using the fob less often also extends battery life — if you have a spare fob, rotating between them can help. Some people keep their spare in a drawer and use it only when the main fob battery is low, which spreads the wear across two batteries instead of one.
Frequently Asked Questions
Can I use a different battery size if I cannot find the exact one?
No. Using the wrong size battery can cause the fob to malfunction or damage the contacts inside. Stick to the exact type listed on your old battery or in the owner's manual. If your store does not have it in stock, they can usually order it for you within a day or two.
Do I need to reprogram my fob after changing the battery?
No. Replacing the battery does not erase the fob's programming. Once you install the new battery, the fob should work when ready without any reprogramming steps.
What if one button works but others do not after the battery change?
This usually means the button contacts inside the fob are worn or corroded, not the battery. A new battery will not fix this. You will need a replacement fob from a dealer or locksmith.
How long does a Chevy key fob battery last?
Most coin-cell batteries last three to four years with normal use. Heavy use — pressing the buttons many times a day — can shorten this to two years. If you notice the fob working only from very close to the car, the battery is likely near the end of its life.
Is it cheaper to replace the battery myself or go to the dealer?
Replacing it yourself costs $3 to $8 for the battery. A dealer will charge $50 to $150 for the same service, including labor. The DIY route saves money and takes only a few minutes once you have the battery in hand.