Last updated: March 15, 2023
In this guide, we'll help you easily and rapidly determine the replacement bulb size(s) you need for your 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006 GMC Sierra 1500 (2nd Generation). From the low beams to the taillights and everything in between.
This guide covers all sub-models and trims (SL, SLE, SLE1, SLE2, SLT, Denali, Sierra HT, C3, and Work Truck) during these 8 years.
We organized all the bulbs into 5 lighting categories with easy-to-read charts. Select any of the categories below to jump right to the bulb size chart you're looking for:
- Headlight Bulb Sizes
- Fog Light Bulb Sizes
- Brake & Tail Light Sizes
- Turn Signal & Marker Bulb Sizes
- All Other Bulb Sizes
- Bulb Size Summary
- Upgrading Your Bulbs (Popular!)
- Installation Video
- Owner Manuals
- FAQ's
💡 TIP: Did you know that you can upgrade your headlight and fog light bulbs on your GMC Sierra 1500? Get up to 300% more light with LED or HID bulbs. Learn more below the size charts!️⭐ NOTE: This guide only applies to 1999 and 2006 Sierra 1500 with the original factory (OEM) assemblies. If you have aftermarket headlights, fog lights, brake lights, etc. you will need different bulb sizes as per the manufacturer's specifications.🎯 ACCURACY: If you notice any inaccuracies or missing information, please let us know so we can update the guide. Providing accurate and complete information is important to us and our readers. 🚧 IMPORTANT: Automotive light bulbs are vehicle-specific! Follow this guide, review your owner's manual or contact your dealership to make sure you're buying the right bulbs to avoid fitment issues.
1999-2006 GMC Sierra 1500 - Headlight Bulb Sizes (Low & High Beam)
| Position | Bulb | Type | Upgrade Avail. |
| Low Beam Headlights (dims) | 9006 (HB4) | Halogen | Yes |
| High Beam Headlight (brights) | 9005 (HB3) | Halogen | Yes |
- Year Range 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006.
- Not sure about the difference between headlight low beams and high beams? Learn More.
1999 to 2002 GMC Sierra 1500 - Fog Light Bulb Sizes
| Position | Bulb | Type | Upgrade Avail. |
| Fog Light | 880 | Halogen | Yes |
- Year Range 1999, 2000, 2001, and 2002.
2003 to 2006 GMC Sierra 1500 - Fog Light Bulb Sizes
| Position | Bulb | Type | Upgrade Avail. |
| Fog Light | 9145 | Halogen | Yes |
- Year Range 2003, 2004, 2005, and 2006.
1999-2006 GMC Sierra 1500 - Brake & Tail Lights Bulb Sizes
| Position | Bulb | Type | Upgrade Avail. |
| Brake Light (Rear) | 3156 (3157) | Halogen | Yes |
| Brake Light (High-Mounted) | 912 (921) | Halogen | Yes |
| Reverse Light | 3156 (3157) | Halogen | Yes |
| Tail Light | 3156 (3157) | Halogen | Yes |
- Year Range 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006.
1999-2006 GMC Sierra 1500 - Turn Signal & Marker Bulb Sizes
| Position | Bulb | Type | Upgrade Avail. |
| Turn Signal Bulb (Front) | 3156 (3157) | Halogen | Yes |
| Turn Signal Bulb (Rear) | 3156 (3157) | Halogen | Yes |
| Parking Light | 3156 (3157) | Halogen | Yes |
| Side Marker (Front) | 194 (168) | Halogen | Yes |
| Side Marker (Rear) | 194 (168) | Halogen | Yes |
- Year Range 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006.
1999-2006 GMC Sierra 1500 - All Other Bulb Sizes
| Position | Bulb | Type | Upgrade Avail. |
| Ash Tray Light | 194 (168) | Halogen | Yes |
| Courtesy Light (Front) | 194 (168) or 74 | Halogen | Yes |
| Courtesy Light (Rear) | 6612 | Halogen | Yes |
| Dome Light | 221-2 (578) | Halogen | Yes |
| Glove Box Light | 194 (168) | Halogen | Yes |
| License Plate Light | 194 (168) | Halogen | Yes |
| Map Light | 194 (168) | Halogen | Yes |
| Trunk/Cargo Light | 912 (921) | Halogen | Yes |
- Year Range 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006.
GMC Sierra 1500 LED/HID Bulb Size Summary
| Year Range | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
| Low Beam Headlights | 9006 (HB4) |
| High Beam Headlight | 9005 (HB3) |
| Fog Light ('99-'02) | 880 |
| Fog Light ('03-'06) | 9145 |
| Brake Light (Rear) | 3156 (3157) |
| Brake Light (High-Mounted) | 912 (921) |
| Back-Up (Reverse) Light | 3156 (3157) |
| Tail Light | 3156 (3157) |
| Turn Signal Bulb (Front) | 3156 (3157) |
| Turn Signal Bulb (Rear) | 3156 (3157) |
| Parking Light | 3156 (3157) |
| Side Marker (Front) | 194 (168) |
| Side Marker (Rear) | 194 (168) |
| Ash Tray Light | 194 (168) |
| Courtesy Light (Front) | 194 (168) or 74 |
| Courtesy Light (Rear) | 6612 |
| Dome Light | 221-2 (578) |
| Glove Box Light | 194 (168) |
| License Plate Light | 194 (168) |
| Map Light | 194 (168) |
| Trunk/Cargo Light | 912 (921) |
- All trims: SL, SLE, SLE1, SLE2, SLT, Denali, Sierra HT, C3, and Work Truck.
Upgrade Your Headlight Bulbs On Your 1999-2006 GMC Sierra 1500
Looking to improve the lights on your 1999 to 2006 GMC Sierra 1500 with better, brighter, and more durable lighting? At XenonPro.com, we developed LED and HID bulbs that fit right into your vehicle. With the same design and plugs, our bulbs are incredibly easy to install and will improve your light output by up to 300%.
- Shop 1999 GMC Sierra 1500 Bulb Upgrades
- Shop 2000 GMC Sierra 1500 Bulb Upgrades
- Shop 2001 GMC Sierra 1500 Bulb Upgrades
- Shop 2002 GMC Sierra 1500 Bulb Upgrades
- Shop 2003 GMC Sierra 1500 Bulb Upgrades
- Shop 2004 GMC Sierra 1500 Bulb Upgrades
- Shop 2005 GMC Sierra 1500 Bulb Upgrades
- Shop 2006 GMC Sierra 1500 Bulb Upgrades
Discover our award-winning lighting products backed by our Lifetime Warranty:
Check out some of our most popular guides:
- LED vs HID - Which Are Better?
- Headlight Replacement Cost - Complete Guide
- Do LED & Xenon HID Headlights Fade Over Time?
- How Long Should Halogen, LED & Xenon HID Headlights Last?
Discover some related topics:
Headlight Bulb & Assembly Replacement Video - 1999-2006 GMC Sierra 1500 (2nd Generation)
Check out this video on how to change your headlamp bulbs and assemblies on your 1999 to 2006 GMC Sierra 1500. All you'll need is a pair of latex gloves.
Owner Manuals 1999 to 2006 GMC Sierra 1500
Need more information about bulb sizes, how to change the bulbs, or simply need the owner's manual? Find it below:
- 1999 GMC Sierra 1500 Owner's Manual
- 2000 GMC Sierra 1500 Owner's Manual
- 2001 GMC Sierra 1500 Owner's Manual
- 2002 GMC Sierra 1500 Owner's Manual
- 2003 GMC Sierra 1500 Owner's Manual
- 2004 GMC Sierra 1500 Owner's Manual
- 2005 GMC Sierra 1500 Owner's Manual
- 2006 GMC Sierra 1500 Owner's Manual
FAQ
Can this guide be applied to a 2000, 2001, 2002, 2003, 2004, or 2005 GMC Sierra 1500?
Yes. This guide applies to all sub-models and trims (SL, SLE, SLE1, SLE2, SLT, Denali, Sierra HT, C3, and Work Truck) for the 1999 to 2006 GMC Sierra 1500.
What type of bulbs do you recommend for my 1999-2006 GMC Sierra 1500?
If you do a lot of nighttime driving or have difficulty seeing at night, we recommend upgrading from halogen to either LED or HID bulbs. They will produce more light and last longer than replacement bulbs.Discover how you can put LED or HID bulbs in your factory headlights
Can I change the bulbs on my 1999-2006 Sierra 1500 myself?
Yes, so long as they are halogens. Changing halogen bulbs is quite easy for the most part. We strongly advise finding How-To videos online for the specific bulb(s) you wish to change and consult the Owner's Manual for additional help.If your vehicle has factory LEDs, you will need to visit your dealership to have them changed.
I purchased aftermarket assemblies for my Sierra 1500, can I use this guide?
No. Aftermarket assemblies typically use different bulb sizes. Consult with the assembly manufacturer for the right bulb size(s).
Sources:
- XenonPro.com Research
- GMC Owner Manuals
- Sylvania Automotive
- Philips Automotive Bulb Finder (USA)
Disclaimer: The information contained on this page is provided free of charge to our visitors. It was prepared to the best of our abilities and with all the information available to us at the time of writing. We reserve the right to change, remove or update any information contained on this page at any time and without notice to improve its accuracy. The most reliable method to determine the bulb size is by pulling your actual bulb(s) and reading the part number indicated directly on the bulb. The information compiled on this page comes with no guarantees or warranties.