Low Key Battery Hyundai Elantra, Low Key Battery Hyundai Elantra (5 Troubleshoot Tips), KevweAuto

Low Key Battery Hyundai Elantra (5 Troubleshoot Tips)

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You head to your Hyundai Elantra, press the key fob button and nothing happens. The dreaded dead key fob battery strikes again! But don’t worry, restoring your keyless entry is an easy fix. This guide will cover why the battery died, how to replace it, and tips to extend the next battery’s lifespan.

A non-working key fob is frustrating and inconvenient. Thankfully a simple CR2032 coin cell battery replacement will have you unlocking and starting your Elantra again in minutes. Here’s everything you need to know about resolving Hyundai key fob battery problems.

Why Did the Battery in My Elantra Key Fob Die?

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The small 3 volt CR2032 lithium coin cell battery in your Hyundai key fob powers all the functions like remote unlock, panic button and even push button start on smart key models. But these batteries gradually run down over time and must be replaced. Here’s how key fob batteries get depleted:

Daily Use

Frequent pressing of buttons drains the battery over the 1-3 year average lifespan. The more you use the remote locking, the quicker the battery expires.

Infrequent Use

Long periods sitting unused also drain CR2032 batteries. So key fobs for rarely driven Elantras often suffer dead batteries too.

Heat Exposure

Leaving key fobs in hot cars in summer and intense heat when charging accelerates battery discharge. Keep your fob out of excessive heat.

Moisture Damage

If water leaks inside the fob housing, it can damage the circuit board and drain the battery prematurely. Use the included protective case.

Accidental Pressing

Stuffing keys in a purse or pocket with items rubbing against buttons will run the battery down through accidental presses.

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Routine replacement as needed keeps your key fob working reliably. Here’s how to swap in a new CR2032 battery.

How to Replace Hyundai Elantra Key Fob Battery

Replacing the battery in the Elantra’s key fob remote is fast and easy. Here are the simple steps:

1. Gather Supplies

  • New CR2032 3 volt coin cell lithium battery
  • Small Phillips screwdriver
  • Clean cloth

Purchase an inexpensive replacement battery widely available at any drug store, big box retailer, home improvement store or online.

2. Pry Open Housing

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Look for the small slot along the side or seam line on your Elantra key fob. Insert a small flathead screwdriver or knife into the slot and gently pry apart the two halves of the plastic housing. Take care not to damage the casing.

3. Remove Old Battery

Locate the CR2032 battery inside mounted in a holder clip. Carefully slide the old battery out of the clip, trying not to bend or damage the small metal electrical contacts.

4. Clean Electrical Contacts

Use a clean cloth to gently wipe away any grease or grime on the battery clip metal contacts inside the key fob. Clean contacts ensure a good connection.

5. Insert New CR2032 Battery

Align the positive “+” side of the new battery facing up in the key fob battery holder. Press down firmly until the CR2032 battery snaps securely into the clip.

6.Reassemble Housing

Double check the battery is seated properly in the clip then rejoin the two halves of the fob casing. Press firmly until the pieces snap back together securely.

After just a few minutes your Elantra key fob will be working like new! Be sure to sync and test all buttons.

Tips for Maximizing Hyundai Key Fob Battery Life

A few simple practices help extend the lifespan of replacement key fob batteries:

  • Store key fobs away from heat and direct sunlight
  • Avoid excessive button pushing to unlock
  • Keep fobs away from liquids and damp areas
  • Routinely inspect gaskets/housing for damage or gaps
  • Attach to key rings loosely to prevent battery contact pressed
  • Replace CR2032 battery at the first sign of reduced range
  • Consider switching to a fob cover that blocks battery when not in use
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Properly maintaining your Elantra’s key fob and promptly changing batteries minimize the hassle of dead key fob batteries at inopportune times.

Troubleshooting Hyundai Elantra Key Fob Issues

While a faulty battery is the most common source of key fob problems, you may encounter other issues that require attention:

No Functionality Even After Battery Change

If replacing the battery doesn’t restore function, the fob may have suffered internal damage from moisture or drops. Inspect closely for casing cracks that allow water intrusion. Try reprogramming before assuming the remote itself has failed.

Short Battery Life Span

If new batteries quickly die again, check for dirt or damage causing a short circuit. An external cause like a heavy keychain or case compression could also be draining batteries prematurely.

Intermittent Issues

Temperature fluctuations and low batteries can cause intermittent fob operation as the car moves in and out of range. This tends to resolve with a fresh battery and examining protection against moisture and debris.

Limited Range

Over time, fob range can decrease and require being closer to the vehicle. Make sure the antenna/receiver inside the car is clean and unobstructed. Check for radio interference from other devices potentially blocking signals.

Sync/Programming Problems

Issues with syncing or programming replacement fobs often stem from incorrect procedures. Carefully follow reprogramming instructions for your specific Elantra year and model. Seek dealer assistance if needed.

While less common than a dead battery, troubleshooting fob problems before replacing the remote can still save time and money.

Options When Hyundai Elantra Key Fob is Completely Unresponsive

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Once in awhile an Elantra key fob reaches the end of its service life and won’t work even after replacing the battery and troubleshooting. Here are your options when the remote becomes completely unresponsive:

1. Attempt to Re-Sync/Reprogram

Consult your owner’s manual and try manually syncing, resetting and reprogramming the fob. This can often revive a fob that’s unresponsive.

2. Replace Key Fob

If reprogramming doesn’t restore functionality, the internal circuits have likely failed. Obtaining a replacement Elantra key fob remote programmed to your vehicle is required.

3. Use Spare Key

If you have a spare key fob, use it instead. Some Elantra models support programming up to 4 keys. Eliminate the problematic fob.

4. Install New Fob Battery as Backup

Always keep at least one working key fob. Should one fail fully, swap the battery in another to have a working backup while sorting out a replacement.

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5. Use Manual Key

The metal backup key inside the fob still operates the door lock as a last resort. You can manually unlock and start the car until obtaining a replacement remote.

With a basic understanding of Hyundai key fob batteries, replacing them when needed takes only minutes without a trip to the dealer. Knowing the right steps and troubleshooting tricks keeps your Elantra key fob operating reliably for years to come.

Frequently Asked Questions about Hyundai Key Fobs:

Elantra owners often have similar key fob queries. Here are the answers to some common key fob battery questions:

What is the replacement battery for Hyundai key fob?

Most Hyundai key fobs use a standard CR2032 3-volt lithium coin cell battery. Match the specs printed on the old battery before purchasing a replacement.

How often do you need to change the key fob battery?

Plan on replacing the Hyundai key fob battery every 1-2 years with average use. Less frequent use can still drain batteries over time. Replace immediately at the first sign of reduced range.

Why does my Elantra key fob not work sometimes?

Intermittent issues are typically caused by a low battery, radio frequency interference, or extreme hot or cold temperatures. Check the battery and examine the fob housing for damage allowing moisture intrusion or dirt.

How much is a new Hyundai smart key?

Replacement smart key fobs range from $100-$300. Costs vary based on whether you program yourself or have dealer programming. Cutting/recoding keys and adding chips increase expense.

How do I reprogram my Elantra key fob?

Consult the owner’s manual for model-specific steps. Often you can sync by turning the key in the ignition, programming buttons or holding fobs near start button in a sequence. Dealer programming may be necessary.


Don’t let a unresponsive key fob leave you stranded and unable to unlock or start your Elantra. Arm yourself with knowledge of simple battery replacement and programming steps to get your keyless entry working again in no time. With smart key fob care and maintenance, you’ll avoid many inconvenient dead battery situations.

Ejenakevwe Samuel

I'm Ejenakevwe Samuel, and my blog is all about sharing the love for cars. Through my blog, I pour my heart into educating fellow car enthusiasts in everything they need to know about their beloved rides. Whether it's driving tips, maintenance tricks, or the latest trends, I aim to empower others to make informed decisions and take care of their vehicles like a pro.

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