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Lost Key Fob for a 2024 GMC Sierra? What to Do Next (US)

Losing the key fob for your 2024 GMC Sierra can leave you stranded or worried about theft—especially if the fob was lost near the truck. The good news: you have several replacement paths depending on whether you still have a spare, and how quickly you need to get back on the road.

Understanding Your Situation

A 2024 GMC Sierra uses an electronic key fob (and may include a hidden emergency key blade). When the fob is missing, you may be unable to unlock/start the truck normally, and a lost fob can remain capable of unlocking/starting the vehicle until it’s removed from the truck’s authorized key list.

🚀 Immediate Steps to Take

  1. Confirm it’s truly lost: retrace steps, check pockets/bags, and use any tracking app (Apple Find My/AirTag, Tile) if attached.
  2. If theft is possible (lost near the truck or with identifying info), move the truck to a secure location and remove valuables; consider contacting local police if you suspect it was stolen.
  3. Locate any spare key/fob and your vehicle info (VIN, registration, photo ID). Call a GMC dealer or an automotive locksmith to confirm availability and schedule replacement/programming; ask about deleting the lost fob from the vehicle.

Your Options

GMC Dealer replacement (OEM key fob + programming)

Cost: $250-$600+ Time: Same day to 1-3 days

The dealer supplies an OEM fob matched to your Sierra’s system and programs it to the truck. They can also remove (erase) the lost fob from the vehicle’s authorized keys for security.

âś“ Pros:
  • OEM parts and correct compatibility for your exact trim/options
  • Dealer can typically perform full key management, including deleting lost fobs
  • Good choice if all keys are lost or you want maximum assurance
âś— Cons:
  • Usually the highest cost option
  • May require towing or on-site support if you have zero working keys and can’t drive in
  • Appointment and parts availability can cause delays

Automotive locksmith (mobile service)

Cost: $180-$450 Time: Same day

A qualified automotive locksmith comes to the truck, supplies a compatible fob (OEM or high-quality aftermarket, depending on availability), and programs it on-site. Many can also delete the missing fob from the system.

âś“ Pros:
  • Convenient on-site service—helpful if you’re stranded
  • Often faster and less expensive than a dealer
  • Can create a spare at the same visit to prevent a future lockout
âś— Cons:
  • Not all locksmiths have the right equipment for late-model GM trucks—verify before dispatch
  • Aftermarket fobs vary in quality; range/features may differ
  • Key deletion capability can vary by provider and vehicle configuration

Add a spare now (if you still have one working fob)

Cost: $150-$400 Time: Same day to 1-3 days

If you still have at least one working fob, you can add a second fob through a dealer or locksmith (and optionally delete the lost one). This reduces the chance of an all-keys-lost situation later.

âś“ Pros:
  • Cheaper and simpler than an all-keys-lost replacement
  • You’ll have a backup if a fob is lost again
  • Can pair with security step of deleting the missing fob
âś— Cons:
  • Doesn’t automatically prevent the lost fob from working unless it’s deleted
  • DIY pairing is not always supported or may be limited on newer models
  • Requires correct fob part number and programming capability

Insurance/roadside assistance support (if covered)

Cost: $0-$600 (depends on coverage and deductible) Time: Same day to 1-7 days

Some comprehensive policies, extended warranties, or roadside plans may reimburse part of the replacement cost or help coordinate towing/locksmith service. You still need a dealer or locksmith to cut/program the key.

âś“ Pros:
  • May reduce out-of-pocket cost
  • Can help with towing or dispatching a provider
  • Useful if all keys are lost and the truck can’t be driven
âś— Cons:
  • Coverage varies widely; deductibles may exceed the key cost
  • Reimbursement can take time and requires documentation
  • May limit you to certain providers

⚠️ What to Avoid

✕ Buying the cheapest online fob without verifying FCC ID/part number compatibility and return policy—wrong fobs are common and can’t be programmed.

✕ Delaying key deletion if theft is possible; a lost fob may still work until it’s removed from the truck’s authorized key list.

✕ Using unvetted services or sharing photos of your VIN/title/ID with unknown sellers—protect personal data and vehicle security.

⚠️ 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 someone drive my 2024 GMC Sierra if they find my key fob?

Potentially, yes—especially if the fob is close enough to the truck to unlock and enable starting. If you suspect it was stolen or lost near the vehicle, prioritize deleting the missing fob from the truck’s authorized keys and securing the vehicle.

Do I need to tow my Sierra to the dealer if I lost my only key fob?

Sometimes. If you have zero working keys, many dealers require the truck on-site for programming, which may mean towing. A mobile automotive locksmith may be able to program a new fob at your location—call first to confirm they support 2024 GM trucks and all-keys-lost situations.

Will a replacement key fob include a physical key?

Many GMC fobs include an emergency key blade inside the fob that can unlock the door mechanically. Whether a new blade is included and whether it needs cutting depends on what you purchase; ask the dealer/locksmith to cut the emergency key to match your truck.

Can I program a new fob myself for a 2024 GMC Sierra?

Some vehicles allow limited owner programming, but late-model GM trucks often require professional programming tools and security access. The most reliable path is a dealer or a qualified automotive locksmith.

How many keys can the 2024 GMC Sierra store, and can the lost one be removed?

The truck can store multiple authorized fobs. A dealer or capable locksmith can typically remove the missing fob from the authorized list during programming so it no longer works with your truck.

⏱️ Urgency Note: If the fob was lost near the truck or with identifying information (address, registration, work badge), treat it as a security risk. Secure the vehicle immediately and arrange to have the missing fob deleted from the vehicle’s system as soon as possible.

Related Information

Need Detailed Information?

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

View Sierra Key Fob Guide →

Last updated: 2026-01-04