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Damaged Key Fob for a 2023 Hyundai Tucson (US): What to Do Next

A damaged key fob on a 2023 Hyundai Tucson can cause intermittent unlocking, push-button start issues, or a completely unresponsive fob. The right fix depends on whether the damage is cosmetic (cracked case) or functional (water exposure, broken buttons, or internal damage). Here’s how to secure your vehicle and choose the safest, most cost-effective solution.

Understanding Your Situation

Physical impact, water exposure, or worn buttons can damage the fob’s case, battery contacts, or internal circuit board. Even if the fob still works sometimes, damage can worsen and leave you unable to unlock or start the vehicle when you need it.

🚀 Immediate Steps to Take

  1. Verify you can still access and start the vehicle: use the mechanical emergency key to unlock the driver door if needed, then start the vehicle using the manufacturer’s emergency start procedure (often holding the fob close to the start button) if the fob battery or signal is weak.
  2. Inspect the fob safely: check for cracks, missing buttons, loose battery door, corrosion, or signs of water intrusion; remove the battery if the fob is wet or you see corrosion to prevent further damage.
  3. Try a known-good battery and dry-out steps: replace with a fresh, correct battery type (commonly CR2032 on many Hyundai fobs) and ensure the battery is seated firmly; if wet, let the fob dry thoroughly at room temperature before testing again.

Your Options

Replace the key fob battery (first-line fix)

Cost: $5-$15 Time: Same day

Install a new coin-cell battery and confirm the battery contacts and cover fit tightly. This can resolve issues that look like damage (intermittent range, delayed response) and is often worth trying even if the case is cracked.

✓ Pros:
  • Lowest cost and fastest
  • Often fixes weak signal or intermittent operation
✗ Cons:
  • Won’t fix water-damaged or physically broken internal components
  • A cracked case may still allow moisture in later

Replace the outer shell/case (keep original electronics)

Cost: $10-$40 Time: Same day / 1-3 days (if ordering parts)

Move the internal circuit board, battery, and (if applicable) the emergency key blade into a new shell. Best for cracked housings, broken buttons, or a missing battery door when the fob still functions.

✓ Pros:
  • Very cost-effective if electronics are still good
  • Restores button feel and protects internals from moisture
✗ Cons:
  • Care is needed to avoid damaging the circuit board during transfer
  • If the board is damaged, a shell swap won’t restore function

Dealer replacement key fob (OEM) + programming

Cost: $250-$550 Time: Same day / 1-3 days (if ordered)

Purchase an OEM fob and have it programmed to your Tucson. The dealer can confirm compatibility by VIN and ensure the new fob is properly registered to the vehicle’s immobilizer system.

✓ Pros:
  • Highest compatibility and reliability
  • Programming and verification handled by the dealer
✗ Cons:
  • Most expensive route
  • May require appointment and proof of ownership

Automotive locksmith replacement + programming (often OEM or high-quality aftermarket)

Cost: $180-$450 Time: Same day

A qualified locksmith supplies a compatible fob and programs it to the vehicle, typically at your location. This is a good option if you need faster service or want to compare pricing.

✓ Pros:
  • Often less than dealer and more convenient (mobile service)
  • Can help if you’re stranded or the dealer is booked
✗ Cons:
  • Quality varies—ensure the fob is correct for a 2023 Tucson (US) and supports push-button start
  • Some situations require dealer-only security access depending on equipment and availability

Repair attempt for water/corrosion damage (limited success)

Cost: $30-$150 Time: Same day / 1-3 days

Carefully clean corrosion and inspect/repair battery contacts or button pads. Best handled by an electronics-capable locksmith or repair shop; success depends on how long the fob was wet and the extent of corrosion.

✓ Pros:
  • May restore a fob without full replacement
  • Useful when parts are backordered
✗ Cons:
  • No guarantee—water damage can cause hidden failures later
  • Not always cost-effective compared with replacement

⚠️ What to Avoid

✕ Avoid using heat guns, ovens, microwaves, or hair dryers on high heat to dry a wet fob—excess heat can warp the case and damage the circuit board and battery.

✕ Avoid buying the cheapest unverified online fob without confirming FCC ID/part compatibility for a 2023 Hyundai Tucson (US) and push-button start—incorrect fobs often can’t be programmed or have poor range.

✕ Avoid forcing the case open with metal tools that can crack the circuit board or damage the battery contacts; use a plastic pry tool and gentle pressure.

⚠️ Common Mistakes to Avoid

  • Throwing away damaged key
  • Not salvaging electronics
  • Buying OEM when aftermarket works
  • Not considering case-only replacement

Frequently Asked Questions

Can I still start my 2023 Hyundai Tucson if the key fob is damaged?

Often, yes. If the vehicle recognizes the transponder inside the fob, you may be able to use the emergency start method by holding the fob close to the START/STOP button while pressing it (exact location/procedure can vary—check your owner’s manual). If the fob’s internal chip or circuit board is damaged, the vehicle may not detect it and you’ll need a replacement programmed key.

If my fob case is cracked but it still works, do I need to replace it?

It’s strongly recommended. A cracked case can let in moisture and dirt, leading to corrosion and sudden failure later. A low-cost shell replacement can prevent a small issue from becoming a no-start/no-entry situation.

Will replacing the battery fix a fob that was dropped?

Sometimes. A drop can momentarily dislodge the battery or weaken contact pressure, which looks like a dead fob. If the circuit board is cracked or a solder joint broke, a new battery won’t help and replacement or repair will be needed.

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

Typically, no. Battery replacement usually does not erase programming. If the fob still doesn’t work after a correct new battery is installed, the issue is more likely physical damage, corrosion, or a compatibility/programming problem with a replacement fob.

⏱️ Urgency Note: If you only have one working key fob or the fob has water exposure/corrosion, treat this as time-sensitive. Damaged fobs can fail without warning, potentially leaving you unable to unlock or start your Tucson—consider arranging a backup key and addressing the damage promptly.

Related Information

Need Detailed Information?

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Last updated: 2026-01-04