Key Fob Not Working high urgency

2024 Hyundai Tucson Key Fob Not Working? Quick Fixes and Your Best Options

Key fob stopped functioning properly

🚀 Immediate Steps to Take

  1. Try the spare key fob (if you have one). If the spare works, the issue is almost certainly the original fob (battery, damage, or internal failure).
  2. Replace the key fob battery with a fresh, name-brand coin cell (commonly CR2032 on many Hyundai fobs—verify the exact type printed on your old battery). Ensure the battery is installed with correct polarity and the contacts are clean and firmly touching.
  3. Use the Tucson’s backup access/start method: use the hidden mechanical key inside the fob to unlock the driver door if needed, then use the vehicle’s emergency start procedure (often holding the fob close to the start button/marked area and pressing START). If it starts this way, the fob battery or signal strength is the likely culprit.

Your Options

DIY battery replacement + resync basics

Cost: $5-$20 Time: Varies

If the Tucson won’t respond to lock/unlock or remote start, a weak battery is the most common cause—especially if range suddenly dropped. Replacing the coin cell and confirming the fob works at close range often resolves the issue without programming. If it still behaves inconsistently, remove other electronics from the key ring and test again to rule out interference.

✓ Pros:
  • Cheapest and fastest fix
  • No appointment needed
  • Often restores full range and reliability
✗ Cons:
  • Won’t fix a damaged fob or a vehicle-side issue
  • Incorrect battery type/polarity can waste time

Use the mechanical key + emergency start (temporary workaround)

Cost: $0-$20 Time: Varies

Your 2024 Tucson key fob typically contains a hidden mechanical key that can unlock the driver door when the fob won’t communicate. Many push-button start systems also allow an emergency start when the fob is held against/near the start button or designated sensor area. This gets you moving while you plan a permanent repair.

✓ Pros:
  • Gets you into the vehicle quickly
  • Works even with a dead fob battery
  • Buys time to shop repair options
✗ Cons:
  • Doesn’t solve the underlying problem
  • Alarm may sound briefly on some vehicles until recognized

Dealer diagnosis, programming, or OEM replacement fob

Cost: $200-$450 Time: Varies

A Hyundai dealer can verify whether the issue is the fob, the vehicle’s receiver/antenna, or a software/configuration problem. If the fob has failed internally or lost programming, the dealer can supply an OEM fob and program it to your Tucson. This is often the most straightforward path when you want guaranteed compatibility and documentation.

✓ Pros:
  • High compatibility and correct programming
  • Can diagnose vehicle-side issues
  • OEM parts and service records
✗ Cons:
  • Usually the most expensive route
  • May require appointment and proof of ownership

Qualified automotive locksmith (programming, replacement, or repair)

Cost: $120-$350 Time: Varies

Many automotive locksmiths can test the fob, cut/program a replacement, or sometimes repair issues like damaged shells and worn buttons. This can be faster and less expensive than a dealer, especially if you’re stranded and need mobile service. Make sure they confirm they can work with late-model Hyundai smart keys and have the right equipment for a 2024 Tucson.

✓ Pros:
  • Often quicker and less expensive than dealer
  • Mobile service may be available
  • Can help when you have no working fob
✗ Cons:
  • Capabilities vary widely by provider and region
  • Aftermarket fobs can be hit-or-miss if low quality

Warranty/coverage check (vehicle warranty, extended warranty, or insurance add-ons)

Cost: $0-$200 Time: Varies

Some extended warranties, vehicle service contracts, or insurance roadside/endorsements may cover lockout assistance or part of a key replacement. Hyundai’s standard warranties typically don’t cover consumables like batteries and may not cover lost/damaged fobs, but it’s worth checking your paperwork before paying out of pocket. If the issue is a defect in a vehicle-side component (not the fob), warranty coverage may apply depending on terms.

✓ Pros:
  • Potentially reduces or eliminates cost
  • May include towing/lockout help
  • Good to verify before buying a new fob
✗ Cons:
  • Coverage varies and may have deductibles
  • May require documentation and approval

⚠️ What to Avoid

✕ Buying the cheapest online ‘compatible’ smart key without confirming FCC ID/part compatibility for a 2024 Tucson—many won’t program or will have poor range.

✕ Letting anyone program keys without verifying proof-of-ownership procedures; legitimate providers should require ID and registration/title to protect you from fraud.

✕ Repeatedly forcing the fob case open with metal tools that can crack the housing, damage the circuit board, or bend battery contacts (a common cause of “new battery but still not working”).

⚠️ Common Mistakes to Avoid

  • Assuming key is broken
  • Not checking battery first
  • Calling tow truck immediately
  • Replacing when reprogramming needed

Frequently Asked Questions

My 2024 Hyundai Tucson starts when the fob is close to the start button, but lock/unlock doesn’t work. What does that mean?

That pattern strongly suggests a weak fob battery or reduced signal strength. Replace the coin-cell battery, confirm correct polarity, and test again at close range and then from a normal distance. If it still fails, the fob may have internal damage or the vehicle may have an antenna/receiver issue that needs diagnosis.

Can a low 12V car battery cause the key fob to seem like it’s not working?

Yes. If the Tucson’s 12V battery is weak, the vehicle may not respond consistently to the fob, and push-button start behavior can be erratic. If you notice slow cranking (if applicable), dim lights, warnings, or repeated no-response events, have the 12V battery tested.

Do I have to go to the dealer to program a 2024 Hyundai Tucson smart key?

Not always. Many qualified automotive locksmiths can program late-model Hyundai smart keys, but capability varies by equipment and region. If you want the highest certainty on compatibility or suspect a vehicle-side module issue, the dealer is often the most straightforward option.

Related Information

Need Detailed Information?

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

View Tucson Key Fob Guide →

Last updated: 2026-01-04