GMC Sierra Headlight Bulb Size

The 2018 GMC Sierra just marked its last year for the 3rd generation model. We await new and exciting upgrades in its 4th generation. Keep a lookout for the latest GMC Sierra Lamp Replacement guide as it will feature some of the best LED and HID lighting upgrades.

The GMC Sierra is much like the Silverado. Its lighting system features a 4-piece design that includes a turn signal, high beam, fog light, and low beam. The current LED bulbs produce more light than the ones in the previous models. These, however, can be upgraded with an LED day liner strip, halo ring add-ons or a HID conversion kit.

The older GMC Sierra produced between 2007 and 2015 came with the cheapest headlight setups that were of low quality. Low beams used H11LL bulbs, fog lights used 5202 bulbs while high beams used 9005LL. The high and low beams produce 1200 lumens on average.
Most owners won’t get the ultimate brightness or luminosity that they may need.

Fortunately, there are multiple LED H11 and HID kits that can be installed in place of the stock bulbs. These are more capable and durable.

Some the aftermarket lighting kits available today produce over 2500 lumens and have LED headlights that can run for more than 50,000 hours. They not only provide enough light but also give your GMC Sierra a sophisticated and stylish look. Available options include HID, LED, and CCFL conversions; 4-piece and 2-piece headlight clusters; chrome and black-out headlights; and LED Dayliners.

GMS Sierra Headlight Bulb Size Chart

2019 Gmc Sierra-2500hd ChartBulb Number
Headlight Bulb High Beam and Low Beam
D5S
Fog Light Bulb Front
5202 LED
Center High Mount Stop Light Bulb
921
Brake Light Bulb
7444
Turn Signal Light Bulb Front
7443A
License Plate Light Bulb
2825
Parking Light Bulb
7443
Tail Light Bulb
7444
Turn Signal Light Bulb Rear
7444NA
Back Up Reverse Light Bulb
921
Side Marker Light Bulb Rear
194NA
Vanity Mirror Light Bulb
6612F
Trunk or Cargo Area Light
921

Having the right bulb size will save you a lot of time when upgrading from your stock incandescent/halogen lamps to LED light bulbs. The GMC Sierra bulb size guide covers models built between 1999 and 2017. This information is for reference only and owners should consult their Sierra manuals for the right bulb size.

Aftermarket Light Bulbs: Upgrade Options

The GMC light bulb size guide is made to be used by anyone from professional GMC mobile electronics installers to amateur GMC enthusiasts. It makes it easy and less tedious to find the correct automotive light bulb sizes. However, it’s advisable always to confirm these details.

Some of the best replacement options for your bulbs include LEDs or HIDs. LED lamp operates at low temperatures and can last for more than 50,000 hours of usage. They give some of the brightest light today. HIDs are similar to standard halogen bulbs but without the heating filament. They use gas and also operate at low temperature. They don’t last as long as LEDs but are more durable and brighter than halogen bulbs.

LEDs are more affordable than HIDs and are easier to fix. For your GMC, you may need multiple power relays and ballast to install an HID conversion kit. More expensive Ultra-bright LED adaptive lights are also available and illuminate turns and corners as you drive.
When choosing your headlight bulbs, remember that higher Kelvin means more blue light while more light output means whiter light. None of these two metrics increase brightness.

Installation & Diagrams

  • Switch off your headlights, set the car to parking brake and open the hood.
  • Remove the headlight assembly pin and pull the assembly out.
  • Unplug the electrical connector and remove the bulb.
  • Install the new bulb into the socket and replace the electrical connector.
  • Push the headlight assembly back into position and turn on your engine. Test if the new lamp works. Replace the retaining pin and shut the hood.

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