What you need to do before you start

Most Chevy key fobs use a coin-cell battery—usually a CR2032, CR2025, or CR2016—that you can swap out yourself in under a minute. The battery sits behind a small door or under a removable case on the fob itself. You do not need any special tools, just a fresh battery from a drugstore or supermarket and sometimes a flathead screwdriver or coin to pry the case open.

Before you buy a replacement, check what battery your fob currently holds. Look on the battery itself—the numbers and letters stamped on it tell you the exact type. If you cannot see the old battery yet, your owner's manual or a quick search for your model year and fob type will tell you which battery to buy. Chevy fobs from the last 20 years almost always use one of those three CR-series batteries, and they cost between $3 and $8.

Key Takeaways

  • Most Chevy key fobs hold a CR2032, CR2025, or CR2016 coin-cell battery that you can replace yourself without tools.
  • The battery door is usually on the back or side of the fob and opens by sliding, prying with a coin, or unclipping a small latch.
  • When you install the new battery, the positive side (marked with a +) must face up or toward the front of the fob.
  • If the fob still does not work after you replace the battery, the problem is likely the fob itself or the receiver in your vehicle, not the battery.

How to open the fob case

The way you open your fob depends on its design. Most Chevy fobs have one of three types of battery doors. The first type slides: look for a small notch or arrow on the back of the fob, and slide the door toward that mark with your fingernail or a coin. The second type has a seam you can pry open with a flathead screwdriver or coin—insert the tool gently into the seam and twist slightly until the case cracks apart. The third type has a small clip or latch you can press or slide to release the door.

If you cannot figure out which type yours is, try the sliding method first—it is the gentlest and least likely to crack the plastic. If the fob does not slide, look for a seam running around the edge and try prying gently with a coin. Do not force it; if it does not give after light pressure, you may have a clip-style fob, and you should look for a small button or lever on the side or bottom of the case.

Removing and replacing the old battery

Once the case is open, you will see the battery sitting in a small metal holder or slot. The battery is usually held in place by nothing more than gravity or a slight lip in the holder. Gently pry it out with your fingernail or the edge of a coin—do not use force, as the holder itself can break if you bend it too far.

Before you install the new battery, look at the old one and note which side was facing up. The positive side of a coin-cell battery is marked with a + symbol and is usually the side you see when you look at the fob. Install the new battery the same way: positive side up or toward the front of the fob. Slide it into the holder until it sits flat and level, then close the case by reversing whatever you did to open it—slide, clip, or press until you hear or feel it lock.

Testing the fob after battery replacement

Stand a few feet from your Chevy and press each button on the fob—lock, unlock, panic, trunk, or whatever buttons yours has. You should see the lights on your vehicle flash or hear a beep. If nothing happens, try pressing the buttons again from closer to the car. If the fob still does not work, open the case again and make sure the battery is sitting flat in its holder and that the positive side is facing the right direction.

If the fob works but the range seems short—you have to stand very close to the car to unlock it—the battery may be low even though it is new. This sometimes happens with old stock batteries. Try a fresh battery from a different store or brand. If a brand-new battery does not restore normal range, the problem is likely the fob's circuit board or the receiver in your vehicle, and you will need to have the fob or vehicle checked by a Chevy dealer or a locksmith.

When to replace the whole fob instead

If you have replaced the battery and the fob still does not work, the fob itself may be damaged or worn out. Water damage, a cracked circuit board, or worn-out buttons can all prevent a fob from working even with a fresh battery. In that case, you have two options: buy a replacement fob from a Chevy dealer or an aftermarket supplier, or have a locksmith program a used fob to your vehicle.

A new OEM (original equipment manufacturer) fob from a Chevy dealer usually costs between $150 and $300 and comes already programmed to your vehicle. An aftermarket fob costs less but may not work with all Chevy models, and you will need to have it programmed. A used fob from a locksmith or online seller is cheaper but carries the risk that it may not program to your specific vehicle or may stop working soon after. If you are unsure which route to take, call your local Chevy dealer and ask what they charge for a replacement fob and programming.

How to avoid battery problems in the future

Coin-cell batteries in key fobs typically last three to four years with normal use. You can extend battery life by keeping the fob away from extreme heat, moisture, and direct sunlight. Do not leave it in a hot car, on a windowsill, or in a bathroom where humidity is high. If you drop the fob or it gets wet, dry it completely before using it again, and consider replacing the battery sooner rather than later—water can corrode the battery contacts and damage the circuit board.

If you use your fob very frequently—unlocking and locking your car many times a day—the battery may wear out faster than three years. In that case, replace it preemptively every two to three years rather than waiting for the fob to stop working. A fresh battery costs just a few dollars and takes a minute to install, so it is much cheaper than being locked out of your car or having to buy a new fob.

Frequently Asked Questions

Can I use any CR2032 battery, or does it have to be a Chevy brand?

Any CR2032 battery from any brand will work in your Chevy fob. Duracell, Energizer, Panasonic, and store brands are all the same size and voltage. Buy whichever is cheapest or most available at your local store. The only thing that matters is that it is the correct type—CR2032, CR2025, or CR2016, depending on your fob—and that it is fresh, not old stock.

What if I put the battery in upside down?

If the battery is installed with the positive side facing the wrong direction, the fob will not work at all. You will not damage the fob or the battery, but nothing will happen when you press the buttons. straightforward open the case again, flip the battery over, and close it. The fob should work when ready.

How do I know if my fob battery is dead or if the fob is broken?

The easiest test is to replace the battery with a fresh one. If the fob works right away, the old battery was dead. If it still does not work after you install a new battery and make sure it is facing the right direction, the fob itself is likely broken. You can also try the battery in another device—a remote control or scale—to confirm it is good before you assume the fob is the problem.

Do I need to reprogram my fob after I replace the battery?

No. Replacing the battery does not erase the fob's programming. As soon as you install the new battery and close the case, the fob should work exactly as it did before. If it does not, the problem is not the battery replacement—it is either the battery itself or damage to the fob.

Can I replace the battery in my Chevy fob at a dealership?

Yes. Most Chevy dealerships will replace a key fob battery for a small fee, usually between $10 and $25. Some will do it while you wait. If you are uncomfortable opening the fob yourself or if you want to make sure it is done correctly, this is a safe option, though it costs more than buying a battery and doing it yourself.