How To Change The Battery in a Hyundai Key Fob

May 17th, 2023 by

You’re all set to head out on your daily commute. You press the unlock button as always, but your car isn’t responding. It’s likely the battery on your Hyundai key fob has died and needs replacing. Despite its momentary inconvenience, it’s actually fairly simple to replace the battery in your key fob at home. In fact, your key fob is designed to make battery replacement easy. Today, we’ll walk you through the type of battery your key fob likely requires, as well as the steps to take to replace the battery and any troubleshooting tips for issues that may arise.

Schedule Service

Necessary Materials and Type of Battery

A car key hanging out of the ignition of a Chevy

First, let’s take a look at the tools you might need to change the battery in a Hyundai key fob. In fact, it’s quite simple — all you’ll need is a new battery. Most Hyundai key fobs use a CR2032 3V battery. These small batteries are quite common and easy to obtain. You’ll typically only spend a few dollars on a pack of multiple.

Of course, we have these batteries conveniently available here at our Service and Parts Center at Allen Turner Hyundai in the Pensacola, Florida, area, so there’s no need to go hunting for the right one. Plus, if your particular key fob requires a different kind of battery, we can help you pick up the right kind for your key fob and advise you on how to change your battery.

Steps To Follow When Changing the Battery in a Hyundai Key Fob

Changing the battery in a Hyundai key fob is relatively straightforward. Each key fob is built to make changing your battery reasonably easy. Here’s a detailed step-by-step walkthrough:

  1. Remove the metal key from the bottom of your key fob by pressing the small metal circular button to release it.
  2. Once the metal key is free, use it to open the key fob by inserting it into the small opening between the release button and the key slot. Turn the key in either direction as you would unlock a door, and the fob will pop open.
  3. With your key fob now open, ensure the fob is facing buttons-down and carefully lift the circuit board to reveal the dead battery underneath. Make a note of the position and direction of the battery (perhaps take a photo) to ensure the new battery is placed correctly. Usually, the battery will be positioned positive side down.
  4. Remove the battery by pulling on it gently or using the metal key to pop it out if necessary.
  5. Recall how the dead battery was positioned in the fob (reference the photo if you took one).
  6. Place the new battery in the same position, ensuring it’s touching all the required connections.
  7. Replace the circuit board and any other parts you removed from the key fob when you opened it. Align the release button peg with its corresponding hole to ensure it snaps together properly.
  8. Replace the metal key into the bottom slot of your key fob.

Once your key fob is put back together, you can press any of its buttons to test whether it’s working again. If a small red light above the unlock button flashes, you have successfully replaced the battery. In case your key fob doesn’t respond to button presses, double-check that you inserted the battery correctly. There’s also a chance your key fob as a whole will need to be completely replaced.

Programming a Hyundai Key Fob

Now your Hyundai key fob is back in working order, you’ll need to reprogram it to sync with your vehicle. For most Hyundai vehicles, you’ll need to follow this process:

  • Sit inside your vehicle and close all the doors.
  • Insert your key into the ignition and turn it to the ON or ACC position (you don’t need to fully start your engine).
  • Hold the unlock button on your key fob until the doors lock. This will indicate that you’re now in program mode.
  • Press and release the lock button on your key fob without holding it down.
  • Within five seconds, press any other button on your key fob. The doors of your vehicle should unlock to indicate you have successfully programmed your key fob.

If you can’t sync your key fob to your vehicle using these steps, your vehicle may require a different process. Check your owners manual for specific information on programming your key fob. In the case your key fob is completely new, you’ll need to have it programmed at our service center, as the method above will only work if you’re reprogramming a key fob that has been programmed before. If you continue to have issues with programming your key fob, don’t hesitate to visit us here in Pensacola, Florida, for further assistance.

The Hyundai Digital Key or Smart Key

If you own a 2020 Hyundai vehicle or newer, you may be able to unlock your vehicle using Hyundai’s Digital Key smartphone app. After a simple setup, simply hold your smartphone against the driver’s side or passenger’s side door handle. Once you’re inside your vehicle, place your smartphone on the wireless charger to activate the start button and start your ignition.

If you can’t access the Hyundai Digital Key app, check whether your vehicle also comes with a Hyundai Smart Key, which enables keyless entry and start. This will allow you to enter your vehicle without the need for a key fob.

Purchase a Replacement Battery at Allen Turner Hyundai

Thanks to the design of the key fob, it’s fairly straightforward to replace a dead Hyundai key fob battery yourself. However, if you have any difficulties with the process, don’t hesitate to contact us by calling our service line at 850-905-5509 or visiting us in person at our service center. Located in the Pensacola, FL, area, we’re open Monday through Friday, 7:30 a.m. to 5:30 p.m., and Saturday, 8 a.m. to 5 p.m. Thanks to our expert team, we’ll have you back on the road in no time.


Image by Ivan Shemereko is licensed with Unsplash License