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Lost Key Fob for a 2023 Hyundai Tucson (US): What to Do Now + Replacement Options

Losing the key fob for a 2023 Hyundai Tucson can leave you stranded and raises security concerns—especially if the fob may have been stolen. The good news: you have multiple replacement paths, and you can reduce risk quickly by disabling lost keys through the dealer or a qualified locksmith.

Understanding Your Situation

Your Hyundai Smart Key fob is missing, so you may not be able to unlock/start the vehicle (unless you have a spare). If the missing fob is still paired to the car, someone who finds it could potentially access and drive the vehicle.

🚀 Immediate Steps to Take

  1. Confirm it’s truly lost: retrace steps, check common spots (bags, coat pockets), and use any tracking app/tag if attached.
  2. If theft is possible, secure the vehicle: park in a well-lit area, remove valuables, and consider a steering wheel lock until keys are disabled.
  3. Arrange key replacement and ask to disable the lost fob(s): contact a Hyundai dealer or an automotive locksmith who supports 2023 Tucson Smart Keys.

Your Options

Hyundai dealer replacement (Smart Key + programming)

Cost: $300-$650 Time: Same day to 1-3 days (depending on parts availability)

The dealer supplies an OEM Smart Key fob and programs it to your Tucson. You can request that all missing/lost keys be erased from the vehicle so only the new and present keys work.

âś“ Pros:
  • OEM parts and correct compatibility for US-market 2023 Tucson
  • Dealer can typically disable lost keys during programming
âś— Cons:
  • Often the most expensive option
  • May require towing or an appointment if you have zero working keys

Mobile automotive locksmith (Smart Key replacement)

Cost: $200-$500 Time: Same day (commonly 1-2 hours on-site once scheduled)

A qualified locksmith comes to you, supplies a compatible Smart Key fob, and programs it on-site. Many can also erase lost keys from the vehicle’s memory (capability varies).

âś“ Pros:
  • Convenient—no need to tow in many cases
  • Usually cheaper than the dealer
âś— Cons:
  • Not all locksmiths can program late-model Hyundai Smart Keys
  • Quality varies—ensure they are licensed/insured and provide an itemized invoice

Use your spare fob now + replace later

Cost: $0 now; $200-$650 later Time: Immediate for driving; replacement same day to 1-3 days

If you still have a working spare, you can drive the vehicle immediately and schedule a replacement fob. You should still plan to erase the lost fob if it may be in someone else’s possession.

âś“ Pros:
  • No towing and minimal disruption
  • Gives you time to compare dealer vs locksmith pricing
âś— Cons:
  • Security risk remains until the lost fob is disabled
  • If you lose the remaining fob, replacement is typically more complicated and costly

Insurance claim (if covered) + replacement

Cost: $0-$650 (depends on coverage and deductible) Time: Same day to 1-7 days (claim processing varies)

If you have comprehensive coverage or a specific key replacement/rental reimbursement endorsement, your insurer may reimburse part of the replacement cost. You still arrange replacement through a dealer or locksmith.

âś“ Pros:
  • May reduce out-of-pocket cost
  • Some policies include towing or rental assistance
âś— Cons:
  • Deductible may exceed the key cost
  • Claims can take time and may affect future premiums (policy-dependent)

⚠️ What to Avoid

✕ Buying a random online fob without confirming exact compatibility (FCC ID/part number/frequency) for a 2023 Tucson—many returns are denied once programming is attempted.

✕ Waiting to disable the lost fob if theft is possible—until it’s erased, it may still unlock/start the vehicle.

✕ Assuming the mechanical emergency key alone will solve it—the metal key may open the door, but the Smart Key is typically required to start the vehicle.

⚠️ Common Mistakes to Avoid

  • Calling dealer first without getting quotes
  • Not checking insurance coverage
  • Rushing to tow to dealership
  • Not considering mobile locksmiths

Frequently Asked Questions

Can I start my 2023 Hyundai Tucson if I lost the key fob?

Typically no, unless you have another working Smart Key. The mechanical emergency key can usually unlock the door, but the vehicle generally requires a programmed Smart Key to start.

Do I need to tow my Tucson to the dealer if I have no working keys?

Sometimes. Some dealers require the vehicle on-site for “all keys lost” situations, while some mobile locksmiths can program on-site. Call ahead with your VIN and confirm their process.

Can the lost key fob be disabled so it won’t work anymore?

Yes. During programming, the dealer (and some locksmiths) can erase missing keys from the vehicle so the lost fob will no longer unlock or start the car.

What do I need to get a replacement Smart Key made?

Expect to provide proof of ownership (registration/title) and a government-issued photo ID. Some providers may also request the VIN and your current address to match documents.

Is it cheaper to buy a used key fob online and have it programmed?

Often not. Many late-model Smart Keys are difficult or impossible to reuse if previously paired, and compatibility issues are common. If you try this route, verify return policies and confirm the fob can be programmed to your specific vehicle.

⏱️ Urgency Note: If the fob was lost in a public place or you suspect theft, treat it as urgent: secure the vehicle and arrange to erase/disable the missing key as soon as possible to reduce the risk of unauthorized entry or theft.

Related Information

Need Detailed Information?

Get vehicle-specific key fob compatibility, part numbers, and a complete price comparison for your 2023 Hyundai Tucson.

View Tucson Key Fob Guide →

Last updated: 2026-01-04