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1999-2006 GMC Sierra 1500 | Bulb Size Chart (Headlights, Fogs & More)

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:


💡 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.


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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.

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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%.

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Discover our award-winning lighting products backed by our Lifetime Warranty:

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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:


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).


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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.