[Working] 2000 GMC Sierra 1500 Regular keeps flashing 'key not recognized'

4155 views - Last reply: April 15, 2025
This topic is closed for new replies.

Trying to program a new key - where's the key code on my 2000 GMC Sierra 1500 Regular?

Hello! We've developed a VIN-based tool to help you get your key code for the 2000 GMC Sierra 1500 Regular. Check it out here: VIN Key Code Generator.

Replies (6)

I tried this with my 2000 GMC Sierra 1500 Regular but still no luck. Any suggestions?

I’ve been locked out of my 2000 GMC Sierra 1500 Regular all week. Hope this helps.

I’m also looking for how to retrieve the key code on a 2000 GMC Sierra 1500 Regular.

Just checking in to say this helped with my 2000 GMC Sierra 1500 Regular. Thanks!

This thread might save my 2000 GMC Sierra 1500 Regular. Thanks everyone!

Trying to avoid reprogramming costs for my 2000 GMC Sierra 1500 Regular. This is a lifesaver.

Check the news !

Drag Racing Championship
🏎️ Local Meetup: Drag Racing Championship
Show off your ride and meet fellow car lovers

🗺️ Where: Waterfront Drive
When: May 23 @ 11AM-4PM

Event features:
Club Displays | Trunk Swap Meet

🔩 Forum Members: Special section just for forum members! 👍

🔩 Brake System Masterclass

👩‍🏭 Instructors:
• Paint Specialist Sarah Chen
• Restoration Pro Alex Petrov

⚙️ Hands-On Activities:
• Interior restoration techniques
• 4-hour intensive training
• Personal coaching

📋 Skills Covered:
Gear patterns | Bearing preload | Locker installation

🏎️ May 19, 2026 at 1:00 PM (4-hour)

💡 Special discounts on tools for participants!

Workshop: Brake System Masterclass
ECU Remapping Masterclass

🔋 ECU Remapping Masterclass

🧰 Instructor: Classic Muscle Tuner Tom 'Torque' Jenkins

📱 Workshop Includes:
• Component selection guides
• 6-hour comprehensive hands-on training
• Suspension geometry | Weight transfer | Damping rates

📉 Bonus: 1-month mentor access

🔌 Next Session: May 6, 2026 at 9:00 AM

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Did you know? Proper tuning can add 20-30% more power from the same hardware

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

Common questions about key programming, fob issues, and replacement options

Security Systems
An anti-theft system that prevents the engine from starting unless it detects the correct transponder chip in the key. The chip sends a unique code to the car's computer when you turn the ignition. No match = no start, even with a physically matching key.
Lost Keys
1) Contact a locksmith who specializes in automotive keys or your dealership 2) Provide proof of ownership (registration, title, ID) 3) They'll either cut new keys by code or reprogram your car's system 4) This is expensive ($200-$800) as the immobilizer may need resetting.
Cost & Options
Quality aftermarket keys work well for most vehicles at lower cost. However, some luxury brands use proprietary technology only available through dealers. For expensive cars, OEM may be worth the extra cost for reliability.
Security Systems
An anti-theft system that prevents the engine from starting unless it detects the correct transponder chip in the key. The chip sends a unique code to the car's computer when you turn the ignition. No match = no start, even with a physically matching key.
Key Tip: Avoid exposing key fobs to water or extreme temperatures
Key Programming
Professional key programming requires: diagnostic tools to access the immobilizer system, key code software, transponder programmers, and often proprietary manufacturer equipment. Some locksmiths and all dealers have these tools.
Key Fact: Key fob batteries typically last 3-4 years with normal use

🔑 KEY SERVICES CLASSIFIEDS

Lost Car Key Replacement
$120+
Posted: Apr 21, 2026
Lost all your keys? We can cut and program new ones even without originals. Dealership alternative at 40% less. Proof of ownership required. Serving all major brands.
Call: 969-593-3689
Smart Key Programming Special
$150
Posted: Apr 30, 2026
Push-to-start key replacement for Toyota, Honda, Nissan, Ford. Includes programming and testing. Limited time offer - normally $200+. Call for availability.
Call: 473-257-2025
Anti-Theft System Repair
$85+
Posted: Apr 21, 2026
Fixing security light issues, PATS systems, and ignition immobilizers. Proper diagnosis before repair. Most vehicles serviced same day. Warranty on all work.
Call: 806-427-5157
Key Fob Case Replacement
$35
Posted: Apr 23, 2026
Cracked or damaged fob housing? We transfer your electronics to a new case. Multiple color options available. Most models in stock. 15-minute service.
Call: 771-497-9094
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Workshop
May 31, 2026

Key Fob Repair Training

by Car Key Solutions
Hands-on experience with the newest transponder key cloning and programming equipment
Workshop
May 12, 2026

Immobilizer System Seminar

by Immobilizer Experts
Learn dealer-level programming techniques normally only available at franchise shops
Seminar
May 18, 2026

Mobile Key Programming Clinic

by The Key Lab
Hands-on training for programming transponder keys, smart keys, and fobs using professional tools
Workshop
May 28, 2026

Key Fob Repair Training

by Car Key Solutions
Learn dealer-level programming techniques normally only available at franchise shops

Need immediate service? Call our 24/7 hotline: 1-800-KEY-HELP

Want to list your key service? Join our provider network

Last posts on the forum