[Resolved] My 2003 GMC Sierra 2500 Extended key was cloned but code still needed?

1249 views - Last reply: February 10, 2025
This topic is closed for new replies.
Cosmokid
Member since October 2022 • 136 posts

How do I find the key code to program a key for my 2003 GMC Sierra 2500 Extended?

Posted on February 10, 2025
Adminbot
Staff Member • 719 posts

Hello! We've developed a VIN-based tool to help you get your key code for the 2003 GMC Sierra 2500 Extended. Check it out here: VIN Key Code Generator.

Posted on February 11, 2025

Replies (3)

Orangesoda
Member • 19 posts

Looking for the same thing for my 2003 GMC Sierra 2500 Extended, hope someone can help.

February 11, 2025 Reply
Electric
Member • 33 posts

My mechanic said this might help with my 2003 GMC Sierra 2500 Extended key issue.

February 12, 2025 Reply
Quantumx
Member • 70 posts

My 2003 GMC Sierra 2500 Extended just blinks. I think this might fix it.

February 13, 2025 Reply

Check the news !

Lowrider Spectacular
🚗 Local Meetup: Lowrider Spectacular
The best local cars all in one place

📍 Where: Waterfront Drive
📅 When: May 22 @ 11AM-6PM

Event features:
Club Displays | Trunk Swap Meet

🔧 Forum Members: First 50 forum members get free dash plaques! 👋

🔧 Classic Car Restoration Workshop

👨‍🔧 Instructors:
• Custom Fabricator Mike 'Wrench' O'Connor
• Master Technician Carlos Rodriguez (20+ years experience)

🛠️ Hands-On Activities:
• Live engine tuning session
• 4-hour intensive training
• Personal coaching

📝 Skills Covered:
Multimeter use | Wiring diagrams | Short circuit tracing

🚗 May 13, 2026 at 12:00 PM (4-hour)

🔥 Network with fellow gearheads during breaks!

Workshop: Classic Car Restoration Workshop
ECU Remapping Masterclass

🔋 ECU Remapping Masterclass

🧰 Instructor: Classic Muscle Tuner Tom 'Torque' Jenkins

📱 Workshop Includes:
• Emission-legal power gains
• 6-hour comprehensive hands-on training
• Gear ratios | Differential tuning | Driveshaft angles

📉 Bonus: 20% discount on performance parts

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

Customize Your Tuning Focus:

🚀 Performance Mod Cost Estimator

Insight: Suspension mods should match your intended use (street vs track)

Vehicle Information

Modification Information

Additional Options

🔑 Car Key & Fob FAQ

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

Lost Keys
Costs vary widely: Basic keys: $50-$150, Transponder keys: $150-$300, Smart keys/fobs: $200-$800, Dealership replacements typically cost 20-50% more than locksmiths. Emergency/lockout service adds $50-$150.
Key Fob Issues
This typically indicates: weak fob battery (replace first), damaged fob antenna, or issues with your car's receiver (often in the door handle or rearview mirror). Environmental interference from other electronics can also reduce range.
Key Tip: Store your key code separately from your keys
Cost & Options
1) Always have at least 2 working keys 2) Get spares made before losing originals 3) Consider key insurance/add-on coverage 4) Store key codes safely 5) Use protective cases for smart keys 6) Program new keys before old ones fail completely.
Key Tip: Avoid exposing key fobs to water or extreme temperatures
Cost & Options
1) Always have at least 2 working keys 2) Get spares made before losing originals 3) Consider key insurance/add-on coverage 4) Store key codes safely 5) Use protective cases for smart keys 6) Program new keys before old ones fail completely.
Key Tip: Keep spare keys in a faraday bag to prevent signal amplification theft
Security Systems
Not recommended. Bypassing requires specialized knowledge and may violate anti-theft laws. Proper solutions: 1) Get correctly programmed keys 2) Replace faulty immobilizer components 3) Have dealer reset the system if keys are lost.
Key Fact: Smart keys use radio frequencies between 125 kHz and 2.4 GHz

🔑 KEY SERVICES CLASSIFIEDS

Lost Car Key Replacement
$120+
Posted: Apr 28, 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: 347-764-4367
Key Fob Repair & Battery Replacement
$25+
Posted: Apr 27, 2026
Fob not working? We fix broken buttons, replace batteries, and resync to your vehicle. Most repairs done while you wait. Water damage specialists available.
Call: 524-788-1078
Transponder Key Duplication
$65+
Posted: Apr 23, 2026
Get spare keys made before you lose yours! Cuts and programs most transponder keys on the spot. Cheaper than dealerships. 15+ years experience.
Call: 912-623-4334
Vintage Car Key Restoration
$55+
Posted: Apr 28, 2026
Specializing in classic car keys (pre-1990). Can reproduce hard-to-find keys for antique vehicles. Museum-quality work for collector cars.
Call: 814-921-6879
Ads refreshed daily • Licensed professionals • Mobile services available

🔑 Upcoming Key & Immobilizer Services

Seminar
May 23, 2026

Anti-Theft System Demonstration

by Fob Fixers
Solutions for when all keys are lost - from code pulling to immobilizer resets
Workshop
May 26, 2026

Key Fob Repair Training

by VIN Decoder Pros
Live demonstration of the latest anti-theft technologies and bypass prevention methods
Workshop
May 19, 2026

Smart Key Programming Class

by Fob Fixers
Live demonstration of the latest anti-theft technologies and bypass prevention methods
Seminar
May 11, 2026

Lost Key Solution Roadshow

by Locksmith Pro
Live demonstration of the latest anti-theft technologies and bypass prevention methods

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