[Answered] 2000 GMC Sierra 2500 Extended remote replaced - car not recognizing it

2286 views - Last reply: January 29, 2025
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Where can I find the key code to program keys for my 2000 GMC Sierra 2500 Extended?

Hello! We've developed a VIN-based tool to help you get your key code for the 2000 GMC Sierra 2500 Extended. Check it out here: VIN Key Code Generator.

Replies (4)

I’m not alone! My 2000 GMC Sierra 2500 Extended is doing the same thing.

Got a dead key fob for my 2000 GMC Sierra 2500 Extended. Need the code badly.

Following along—same issue with my 2000 GMC Sierra 2500 Extended.

Thanks for sharing! Been looking for a key code fix for my 2000 GMC Sierra 2500 Extended.

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Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
Security Systems
A flashing security light often indicates an immobilizer issue. Solid light suggests the system is armed but not recognizing your key. Causes: faulty key chip, damaged antenna ring, low battery, or system needs reprogramming.
Key Programming
Programming syncs the key's transponder chip with your car's immobilizer system. The process varies by manufacturer but generally involves: 1) authenticating with the car's computer 2) erasing old keys if needed 3) programming new key codes 4) testing functionality.
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Key Fob Issues
1) Find the seam and pry open the fob (some have tiny screws) 2) Note battery orientation 3) Remove old battery (CR2032 is most common) 4) Insert new battery 5) Reassemble. Test all buttons - if issues remain, the fob may need reprogramming.
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