Open the key fob and swap out the old battery in five minutes
Most Volkswagen key fobs use a coin-cell battery that you can replace yourself without tools or a trip to the dealer. The battery sits behind a removable cover on the back of the fob, and the whole job takes longer to find the right battery than to install it. You do not need to reprogram the fob afterward — it will work when ready once the new battery is in place.
The process is the same whether you drive a Golf, Jetta, Passat, or Tiguan. The only variable is which battery size your fob needs, and that depends on the year and model of your car. Once you know the size, you can buy a replacement at any pharmacy, grocery store, or online retailer for between two and five dollars.
Key Takeaways
- Volkswagen key fobs use a CR2032, CR2025, or CR2016 coin-cell battery depending on the model year, and you can find the correct size in your owner's manual or by looking at the battery compartment itself.
- The fob opens by sliding a small metal lever or pressing a release button on the back, and the battery slides out without any tools or force.
- New batteries cost two to five dollars and are sold at pharmacies, supermarkets, and online retailers under the battery aisle or electronics section.
- The fob does not need to be reprogrammed after you install a new battery — it will work the moment you close the cover.
Find out which battery your fob needs
The battery type is printed on the old battery itself once you open the fob. If you want to know before opening it, check your owner's manual — most Volkswagen manuals list the battery type in the key fob section or in the specifications at the back.
Volkswagen most commonly uses the CR2032 battery, which is the standard coin-cell size. Some older models use CR2025 or CR2016, which are slightly thinner. The three types are not interchangeable, so buying the wrong one means a wasted trip. If you cannot find the information in your manual, call your Volkswagen dealer with your vehicle identification number (VIN) and they will tell you the correct battery in one minute.
Locate the battery compartment on the back of the fob
Flip the fob over so you are looking at the back. You will see either a small metal lever or a recessed button near the edge of the plastic case. This is the release mechanism that opens the fob.
If your fob has a metal lever, slide it gently in the direction of the arrow (usually toward the edge of the fob). The back cover will pop off slightly. If your fob has a recessed button, press it firmly with your fingernail or a coin and the cover will release. Do not force either one — if it does not move easily, you are pushing in the wrong direction.
Remove the old battery and install the new one
Once the back cover is off, you will see the battery sitting in a small metal or plastic holder. The battery is usually held loosely in place and will slide out with a gentle push or pull. If it is stuck, a fingernail or the edge of a coin will dislodge it without damage.
Before you install the new battery, check which side is facing up on the old one. The new battery must go in the same way — positive side up or positive side down, depending on how your fob is designed. Most Volkswagen fobs have the positive side facing up, but looking at the old battery takes the guesswork out.
Slide the new battery into the holder in the same orientation as the old one. You should hear or feel a small click as it seats. Do not force it — it should slide in smoothly.
Close the fob and test the buttons
Align the back cover with the fob body and press it down firmly until you hear a click. The cover should sit flush with the rest of the fob with no gaps. If the cover does not close all the way, the battery may be installed upside down — open it again and flip the battery.
Once the cover is closed, press each button on the fob (lock, unlock, panic, trunk) while standing near your car. You should see the lights flash or hear the car respond. If nothing happens, open the fob again and check that the battery is seated properly and facing the correct direction.
Where to buy a replacement battery
Coin-cell batteries are sold in the pharmacy or health and beauty section of most grocery stores and drugstores. CVS, Walgreens, Target, and Walmart all stock CR2032, CR2025, and CR2016 batteries. You can also order them online from Amazon, eBay, or the manufacturer's website — they ship quickly and cost the same or less than in-store prices.
Buy a name-brand battery (Energizer, Duracell, Panasonic, or Sony) rather than a generic store brand. The difference in price is usually fifty cents, and name-brand batteries last longer and are less likely to leak inside your fob.
What to do if the fob still does not work after replacing the battery
If the fob buttons do not respond after you install a new battery and close the cover, the problem is usually one of three things: the battery is upside down, the battery is not seated all the way, or the battery contacts inside the fob are dirty.
Open the fob again and flip the battery. If that does not work, remove the battery and look at the metal contacts inside the fob — they should be shiny and clean. If they are dark or corroded, wipe them gently with a dry cloth or a pencil eraser. Reinstall the battery and test again.
If the fob still does not work after you have tried both of those steps, the problem is likely inside the fob itself (a broken circuit board or button contact) rather than the battery. At that point, contact your Volkswagen dealer about a replacement fob. A new OEM fob costs between eighty and one hundred fifty dollars depending on the model, and the dealer can program it to your car in about fifteen minutes.
Frequently Asked Questions
Do I need to reprogram my key fob after I change the battery?
No. Volkswagen key fobs do not need to be reprogrammed when you replace the battery. The fob will work when ready once you close the cover and install the new battery. Reprogramming is only necessary if you buy a brand-new fob or if the fob was lost or stolen.
How long does a key fob battery last?
Most coin-cell batteries last between three and four years in a key fob, depending on how often you use the buttons. If you use your fob multiple times per day, the battery may last only two to three years. If you use it rarely, it may last four to five years.
Can I use a rechargeable battery in my Volkswagen key fob?
Rechargeable coin-cell batteries exist, but they are not recommended for key fobs. Rechargeable batteries have a lower voltage than disposable ones and may not provide enough power to trigger the fob's transmitter reliably. Stick with a standard disposable CR2032, CR2025, or CR2016 battery.
What should I do with the old battery?
Coin-cell batteries contain small amounts of lithium and should not go in the trash. Most pharmacies and electronics stores have battery recycling bins near the checkout or customer service desk. You can also take old batteries to a local hazardous waste collection event — check your city or county website for dates and locations.
Can I buy a universal key fob battery, or does it have to be for Volkswagen?
There is no such thing as a Volkswagen-specific battery. The CR2032, CR2025, and CR2016 are universal coin-cell sizes used in key fobs, watches, calculators, and hearing aids from every manufacturer. Any CR2032 battery will work in any Volkswagen fob that uses that size, regardless of the brand.