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2024 Kia Sorento: Dead Key Fob Battery Symptoms, Quick Fixes & What to Do Next

If your 2024 Kia Sorento key fob suddenly won’t lock/unlock or the vehicle won’t detect the fob, the most common cause is a dead (or weak) fob battery. The good news: you can usually still get in and start the Sorento, then replace the battery in minutes.

Understanding Your Situation

The small coin-cell battery inside the Sorento smart key has lost voltage, so the fob can’t reliably transmit/receive the signal needed for keyless entry and push-button start. Cold weather, an older battery, or leaving the fob near the vehicle can accelerate battery drain.

🚀 Immediate Steps to Take

  1. Use the hidden mechanical key to unlock the driver’s door (there’s a key blade inside the fob; remove the cover on the door handle if equipped).
  2. Start the vehicle using the emergency start method: hold the fob against/near the START/STOP button and press the button while pressing the brake (exact touchpoint can vary by trim).
  3. Replace the key fob battery with the correct coin cell (commonly CR2032 for many Kia smart keys—confirm by checking the old battery or your owner’s manual), then test lock/unlock and remote start (if equipped).

Your Options

DIY battery replacement (most common fix)

Cost: $3-$12 Time: Same day

Open the smart key case, swap the coin-cell battery for a new name-brand battery, and reassemble. No programming is typically required for a battery change.

âś“ Pros:
  • Fast and inexpensive
  • Usually restores full function immediately
âś— Cons:
  • You must open the fob carefully to avoid cracking the case
  • If the issue isn’t the battery (fob damage/interference), this won’t resolve it

Battery replacement at a parts store or dealership service lane

Cost: $0-$25 Time: Same day

A retailer or dealer replaces the battery for you (sometimes free with purchase). Helpful if you don’t want to pry open the fob yourself.

âś“ Pros:
  • Less risk of damaging the fob case
  • Quick confirmation the correct battery is installed
âś— Cons:
  • May require a trip during business hours
  • Not all locations stock the correct battery type

Replace the smart key fob (if battery replacement doesn’t help)

Cost: $250-$600 Time: Same day / 1-3 days (if ordered)

If the fob has water damage, cracked circuit board, or failed buttons, you may need a new OEM smart key and programming to the vehicle.

âś“ Pros:
  • Restores like-new reliability
  • Addresses physical/electronic fob failures beyond the battery
âś— Cons:
  • Higher cost than a battery
  • Programming and proof of ownership are typically required

Mobile automotive locksmith diagnosis and replacement (where available)

Cost: $120-$450 Time: Same day

A locksmith can test the fob signal, replace the battery, and if needed supply/program a compatible fob at your location.

âś“ Pros:
  • Convenient if you’re stranded
  • Often faster than waiting for dealer appointments
âś— Cons:
  • Quality and pricing vary by provider
  • Some aftermarket fobs may have shorter range or reduced durability vs OEM

⚠️ What to Avoid

✕ Don’t force the fob open with a large screwdriver or knife—use a small plastic pry tool to reduce the chance of cracking the case or damaging the seal.

✕ Don’t install the new coin cell upside down or touch both sides excessively with bare fingers (oils can reduce contact quality); ensure the battery sits firmly under the retaining clips.

✕ Don’t assume it’s “the car battery” right away—if the Sorento starts normally when the fob is held to the start button, the vehicle battery is usually fine and the fob battery is the culprit.

Frequently Asked Questions

Can I still start my 2024 Kia Sorento if the key fob battery is dead?

Yes. Most Sorento push-button start systems have an emergency start method. Typically you hold the fob against/very close to the START/STOP button and press it while holding the brake. This allows the vehicle to read the fob even when the fob battery is weak or dead.

What battery does a 2024 Kia Sorento key fob use?

Many Kia smart keys use a CR2032 coin-cell battery, but it can vary by fob version. The safest way to confirm is to open the fob and read the battery number printed on the old coin cell or verify in your owner’s manual.

Do I need to reprogram the key fob after replacing the battery?

Usually no. A battery swap does not typically erase programming. If the fob still doesn’t work after a fresh battery, the issue may be a damaged fob, poor battery contact, or vehicle-side interference/antenna concerns.

Why did my key fob battery die so quickly?

Common causes include an older coin cell, extreme temperatures, frequent button presses, storing the fob very close to the vehicle (it can “wake up” repeatedly), or a stuck button. If batteries repeatedly die in weeks, have the fob inspected for a sticking button or internal fault.

⏱️ Urgency Note: Low to moderate urgency: you can typically unlock with the mechanical key and start using the emergency method, but replace the battery soon to avoid being locked out or unable to use keyless entry/remote start when you need it.

Related Information

Need Detailed Information?

Get vehicle-specific key fob compatibility, part numbers, and a complete price comparison for your 2024 Kia Sorento.

View Sorento Key Fob Guide →

Last updated: 2026-01-04