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Damaged Key Fob for a 2023 Toyota Highlander: What to Do Next

If your 2023 Toyota Highlander key fob is cracked, water-exposed, or not responding, the issue may be physical damage rather than a simple low battery. Because the fob is part of the vehicle’s security system, the safest path is to stabilize the situation first, then choose a repair or replacement option based on how badly it’s damaged.

Understanding Your Situation

A damaged key fob can have broken buttons, a cracked case, a loose battery contact, or internal circuit damage from drops, crushing, or moisture. Even if the mechanical emergency key still works in the door, a damaged fob may not unlock/lock remotely or enable push-button start reliably.

🚀 Immediate Steps to Take

  1. Use the mechanical emergency key (inside the fob) to access the vehicle if needed, and keep the damaged fob away from water and extreme heat.
  2. If the fob was exposed to liquid: remove the mechanical key, open the fob if possible, take out the battery, gently dry the exterior, and let the fob air-dry (do not use a microwave, oven, or high heat).
  3. Try a known-good coin-cell battery (correct type for your fob) and inspect for obvious damage (cracked shell, missing buttons, bent battery clips). If the vehicle starts only when the fob is held close to the start button, schedule service—internal damage is likely.

Your Options

Replace the fob shell/case (if electronics are OK)

Cost: $15-$60 Time: Same day

Move the internal circuit board and battery into a new OEM-style shell when the outside is cracked or buttons are broken but the electronics still function.

âś“ Pros:
  • Lowest-cost fix when damage is cosmetic
  • No vehicle programming usually needed if you reuse the original electronics
âś— Cons:
  • Doesn’t fix water/circuit-board damage
  • Poor-quality shells can fit badly or cause button issues

Battery and contact cleanup (minor damage only)

Cost: $5-$15 Time: Same day

Install a fresh battery and gently clean battery contacts if there’s light corrosion or intermittent power (no major water intrusion).

âś“ Pros:
  • Fast and inexpensive
  • May restore function if the issue is power-related
âś— Cons:
  • Not a solution for cracked circuit boards or waterlogged fobs
  • Aggressive cleaning can damage contacts

Professional key fob replacement and programming (dealer)

Cost: $300-$700 Time: 1-3 days

Purchase a new Toyota-compatible smart key fob and have it programmed to your Highlander’s immobilizer/smart key system by a Toyota dealer.

âś“ Pros:
  • Highest compatibility and support
  • Programming and security pairing handled correctly
âś— Cons:
  • Most expensive option
  • May require proof of ownership and an appointment

Mobile automotive locksmith replacement and programming

Cost: $200-$500 Time: Same day / 1-2 days

A licensed locksmith supplies a compatible smart fob and programs it on-site. Availability and pricing vary by area and key type.

âś“ Pros:
  • Often faster than a dealer
  • On-site service (helpful if you’re stranded)
âś— Cons:
  • Quality varies—verify licensing, reviews, and warranty
  • Some vehicles/keys may still require dealer support for certain functions

Add a spare key now (prevent future lockouts)

Cost: $200-$600 Time: Same day / 1-3 days

If you still have one working key, get a second smart fob made and programmed before the damaged one fails completely.

âś“ Pros:
  • Reduces risk of being stranded
  • Usually cheaper/easier than replacing all keys after total loss
âś— Cons:
  • Upfront cost
  • Requires scheduling and proof of ownership

⚠️ What to Avoid

✕ Don’t keep pressing buttons repeatedly on a wet or damaged fob—this can worsen internal shorts and corrosion.

✕ Don’t dry a wet key fob with high heat (hair dryer on hot, oven, microwave) or spray it with harsh chemicals; both can damage seals and electronics.

✕ Don’t buy the cheapest unverified fob online and assume it will program—incorrect FCC/part compatibility can waste time and money.

⚠️ 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 Highlander if the key fob is damaged?

Sometimes. If the fob’s battery is weak or the signal is failing, the vehicle may still start when the fob is held very close to the start button (backup proximity method). If the fob has internal damage, this may not work reliably and you should arrange replacement and programming.

Will replacing the battery fix a dropped or cracked key fob?

It can if the drop only caused the battery to shift or lose contact. If buttons are broken, the case is split, or the circuit board is damaged, a new battery won’t fully solve the problem—consider a shell replacement (if electronics are intact) or a full fob replacement.

Do I need to tow the vehicle to the dealer for a replacement fob?

Not always. If you can unlock the door with the mechanical key and start the vehicle, you can usually drive to the dealer. If you can’t start the vehicle or have no working key, a mobile locksmith or towing to a dealer may be necessary.

Is a used key fob safe to buy for a 2023 Highlander?

Used smart keys can be risky because many are locked to the original vehicle and may not be reusable. For best results, confirm compatibility (correct FCC ID/part number) and buy from a reputable source with a return policy—or choose a new OEM fob through a dealer or reputable locksmith.

⏱️ Urgency Note: If the damaged fob is your only key, treat this as urgent—get a replacement and program it before the fob fails completely. If the fob was submerged or exposed to saltwater, corrosion can progress quickly even after drying.

Related Information

Need Detailed Information?

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

View Highlander Key Fob Guide →

Last updated: 2026-01-04