Looking for the correct bulb size for a 2014–2018 GMC Sierra 1500 or 2015–2019 GMC Sierra 2500HD or 3500HD? This guide covers factory halogen, HID and LED headlight configurations along with fog lights, front turn signals, reverse lights, cargo lights, license plate lights and compatible LED upgrades.
Sierra lighting configurations vary by year and factory headlight package, especially on 2016–2018 Sierra 1500 trucks. Use the charts and identification information below to verify your factory lighting before ordering replacement bulbs.
GMC Sierra Headlight, Fog Light & Turn Signal Bulb Sizes
The correct Sierra headlight and front turn-signal replacement depends on the factory headlight assembly. Fog-light fitment also differs between Sierra 1500 and Sierra HD trucks.
| Vehicle | Factory Headlight | Fog Light | Front Turn Signal |
|---|---|---|---|
| 2014–2015 Sierra 1500 | 9012 Halogen | 5202 | 7443 |
| 2016–2018 Sierra 1500 — Halogen | 9012 Halogen | Factory LED — no replaceable bulb | 7443 |
| 2016–2018 Sierra 1500 — HID | D5 HID | Factory LED — no replaceable bulb | Built-in LED |
| 2016–2018 Sierra 1500 — Factory LED | Factory LED — no replaceable bulb | Factory LED — no replaceable bulb | Built-in LED |
| 2015 Sierra 2500HD / 3500HD — Halogen | 9012 Halogen | 5202 | 7443 |
| 2016–2019 Sierra 2500HD / 3500HD — Halogen | 9012 Halogen | 5202 | 7443 |
| 2016–2019 Sierra 2500HD / 3500HD — HID | D5 HID | 5202 | Built-in LED |
Which Headlights Does My GMC Sierra Have?
Identifying the factory headlight configuration is one of the most important steps when purchasing replacement lighting for a Sierra. This is especially important on 2016–2018 Sierra 1500 models, which were available with multiple factory headlight systems.
9012 Halogen Headlights
Factory halogen Sierra headlights use a replaceable 9012 headlight bulb. These are the applications covered by the FUZED LED installation tutorial below and can be upgraded using compatible FUZED LED 9012 bulbs.
D5 HID Headlights
Some 2016–2018 Sierra 1500 and 2016–2019 Sierra 2500HD/3500HD trucks were equipped with factory D5 HID headlights. These are different from the 9012 halogen configuration and should not be ordered as a 9012 application.
Factory LED Headlights
Some Sierra 1500 trucks were equipped with complete factory LED headlight assemblies. These assemblies do not use a conventional replaceable halogen headlight bulb.
Not Sure Which One You Have?
Check the existing bulb and headlight assembly before ordering. The factory connector, bulb markings and headlight design can help identify whether the truck is equipped with halogen, HID or factory LED lighting.
9012 LED Headlight Bulbs for GMC Sierra
GMC Sierra models equipped with the factory 9012 halogen headlight system can be upgraded with FUZED LED 9012 headlight bulbs.
FUZED LED offers multiple 9012 LED options so you can choose the headlight series that best matches your desired output and driving needs.
Shop 9012 LED Headlight Bulbs
Compare FUZED LED 9012 headlight options for compatible GMC Sierra factory halogen headlight applications.
Shop 9012 LED BulbsGMC Sierra Fog Light Bulb Sizes
2014–2015 GMC Sierra 1500
2014–2015 GMC Sierra 1500 models use a replaceable 5202 fog-light bulb.
2016–2018 GMC Sierra 1500
2016–2018 Sierra 1500 models use factory LED fog lights. These assemblies do not use a conventional replaceable fog-light bulb.
2015–2019 GMC Sierra 2500HD & 3500HD
Sierra 2500HD and 3500HD trucks in this guide use a 5202 fog-light bulb.
GMC Sierra Reverse, Cargo & License Plate Bulb Sizes
In addition to the headlights and fog lights, several exterior lighting locations use replaceable bulbs across the Sierra models covered by this guide.
| Lighting Location | Bulb Size / Type | Notes |
|---|---|---|
| Reverse / Backup Lights | 921 | Used across the Sierra applications covered in this guide. |
| Cargo / Third Brake Light | 921 / 912 | Bulb size may vary by configuration. Verify the original bulb before ordering. |
| License Plate Lights | 194 / T10 | Replaceable license plate bulb. |
| Front Turn Signal — Halogen Headlight Models | 7443 | Used on models equipped with factory halogen headlights. |
| Front Turn Signal — HID / LED Headlight Models | Built-in LED | No conventional replaceable turn-signal bulb. |
| Rear Brake / Turn — Non-LED Tail Lights | 7443 / 7444 | LED conversion can require additional resistance to prevent hyperflash. |
| Factory LED Tail Lights | Integrated LED | No conventional replaceable brake/turn bulb. |
How to Install 9012 LED Headlight Bulbs in a GMC Sierra
The installation below was performed on a 2015 GMC Sierra 1500 equipped with factory halogen headlights. The truck uses a replaceable 9012 headlight bulb.
This installation procedure also applies to compatible 2014–2018 GMC Sierra 1500 and 2015–2019 Sierra 2500HD/3500HD factory-halogen applications covered by this guide. Access and surrounding components can vary slightly by year and configuration.
Before You Start
The passenger side requires more disassembly than the driver side. On the 2015 Sierra 1500 shown here, the passenger-side airbox is removed to gain access to the rear of the headlight assembly.
After completing the passenger side, the driver-side bulb can be replaced using the same basic bulb-removal and installation procedure without removing the airbox.
Remove the Upper Cover Panel
Begin on the passenger side. Remove the retaining clips securing the upper cover panel, then lift the panel away from the truck and set it aside.
Disconnect the Mass Air Flow Sensor
Unlock the mass air flow sensor connector by sliding the red locking tab upward. Squeeze the connector and carefully wiggle it upward to disconnect it.
Remove the Passenger-Side Airbox
Remove the two 10mm bolts from the support rod and set the rod aside. Unclip the wiring harness from the airbox, loosen the hose clamp on the intake tube and work the intake tube loose.
Once everything is disconnected, pull straight upward on the airbox to remove it from the truck.
Move the Headlight Trim Panel
Remove the retaining clips and wiring-harness clips from the trim panel behind the passenger-side headlight assembly. Pull the panel back far enough to access the rear headlight dust cover.
Remove the Headlight Dust Cover
With the rear of the headlight accessible, rotate the factory dust cover counterclockwise to unlock it. Remove the cover to expose the factory headlight bulb.
Remove the Factory 9012 Halogen Bulb
Disconnect the factory bulb connector by lifting the connector clip while pulling the connector away from the bulb.
Rotate the factory 9012 halogen bulb counterclockwise and carefully remove it from the headlight housing.
Connect the FUZED LED 9012 Bulb
When connecting the F1 Series LED bulb, pay attention to the positive and negative markings on the connector. On the bulb shown in this installation, line the red wire up with the positive (+) marking.
Install and Align the LED Headlight Bulb
Line up the tabs on the 9012 LED bulb with the headlight housing. Insert the bulb and rotate it clockwise until it locks securely into place.
After the bulb is locked into the housing, rotate the bulb within its adjustable base so that the LED chips face left and right inside the headlight housing.
On the F1 Series bulb shown here, the fan wire pointing straight upward provides a quick visual reference that the LED chips are positioned left and right.
Test the LED Headlight Before Reassembly
Before reinstalling the dust cover, airbox and trim components, test the new LED headlight to confirm that it is operating correctly.
Reinstall the Dust Cover
Once the LED bulb has been tested and its orientation confirmed, reinstall the factory headlight dust cover. Make sure the cover is fully seated and locked into position.
Reinstall the Airbox and Passenger-Side Components
Reinstall the passenger-side airbox, intake tube, support rod, wiring clips and upper cover panel in the reverse order of removal.
Make sure the mass air flow sensor connector is fully reconnected and locked before starting the truck.
Installing the Driver-Side LED Headlight
The driver side is considerably easier on the 2015 Sierra 1500 shown in this guide because the headlight can be accessed without removing the passenger-side airbox components.
Remove the driver-side dust cover, disconnect and remove the factory halogen bulb, install the FUZED LED bulb, set the correct LED-chip orientation, test the bulb and reinstall the dust cover.
Ready to Upgrade Your Sierra's 9012 Headlights?
If your GMC Sierra is equipped with the factory 9012 halogen headlight configuration, compare the available FUZED LED 9012 upgrades below.
Shop 9012 LED HeadlightsGMC Sierra LED Headlight Beam Pattern
LED output is about more than simply producing more light. The position of the LED chips inside the factory housing also affects how the headlight projects light onto the road.
This is why the F1 Series bulb is rotated after installation so the LED chips face left and right inside the Sierra headlight housing.
Why LED Bulb Alignment Is Important
The original halogen headlight places its filament at a specific location inside the housing. A properly designed LED replacement attempts to place its light-producing surfaces in a similar position so the factory optics can continue directing the light effectively.
Installing an adjustable LED bulb in the wrong rotational position can change the resulting beam. For the F1 Series installation shown here, position the LED chips so they face left and right.
Finished FUZED LED Headlight Output
Below is the completed FUZED LED headlight installation on the 2015 GMC Sierra 1500 used for this guide.
Complete GMC Sierra Bulb Size Reference
| Location | 2014–2015 Sierra 1500 | 2016–2018 Sierra 1500 | 2015–2019 Sierra 2500HD / 3500HD |
|---|---|---|---|
| Headlight — Halogen | 9012 | 9012 | 9012 |
| Headlight — HID | — | D5 on equipped models | D5 on equipped 2016–2019 models |
| Headlight — Factory LED | — | Integrated LED on equipped models | Verify factory configuration |
| Fog Light | 5202 | Factory LED / no replaceable bulb | 5202 |
| Front Turn Signal — Halogen Headlights | 7443 | 7443 | 7443 |
| Front Turn Signal — HID / LED Headlights | — | Built-in LED | Built-in LED on applicable models |
| Reverse / Backup | 921 | 921 | 921 |
| Cargo / Third Brake Light | 921 / 912* | 921 / 912* | 921 / 912* |
| License Plate | 194 / T10 | 194 / T10 | 194 / T10 |
| Rear Brake / Turn — Non-LED Tail Light | 7443 / 7444* | 7443 / 7444* | 7443 / 7444* |
| Factory LED Tail Light | Integrated LED | Integrated LED | Integrated LED |
*Some lighting locations and configurations can vary. Verify the original bulb and factory lighting configuration before ordering.
GMC Sierra Bulb Size & LED Headlight FAQ
What headlight bulb does a 2014 GMC Sierra 1500 use?
The 2014 GMC Sierra 1500 covered by this guide uses a 9012 halogen headlight bulb. A compatible 9012 LED bulb can be used when upgrading the factory halogen application.
What headlight bulb does a 2015 GMC Sierra 1500 use?
The 2015 GMC Sierra 1500 uses a 9012 halogen headlight bulb. The installation tutorial above was performed on a 2015 Sierra 1500 with factory halogen headlights.
What headlight bulb does a 2016–2018 GMC Sierra 1500 use?
It depends on the factory headlight configuration. 2016–2018 Sierra 1500 trucks can be equipped with 9012 halogen headlights, D5 HID headlights, or factory LED headlights with no conventional replaceable headlight bulb. Verify your factory headlight system before ordering.
What headlight bulb does a 2015–2019 GMC Sierra 2500HD or 3500HD use?
Factory halogen Sierra 2500HD and 3500HD applications covered by this guide use a 9012 headlight bulb. Some 2016–2019 HD trucks were also available with D5 HID headlights, so the factory headlight configuration should be verified before ordering.
What fog light bulb does a GMC Sierra use?
2014–2015 Sierra 1500 trucks use a 5202 fog-light bulb. 2016–2018 Sierra 1500 trucks use factory LED fog lights with no conventional replaceable bulb. The 2015–2019 Sierra 2500HD and 3500HD applications covered by this guide use 5202 fog-light bulbs.
What reverse light bulb does a GMC Sierra use?
The GMC Sierra models covered by this guide use a 921 reverse or backup light bulb.
What license plate bulb does a GMC Sierra use?
The Sierra models covered in this guide use a 194/T10 license plate light bulb.
What front turn-signal bulb does a GMC Sierra use?
Sierra models equipped with the factory halogen headlight configuration use a 7443 front turn-signal bulb. Models equipped with the applicable factory HID or LED headlight assemblies use integrated LED front turn signals instead of a conventional replaceable bulb.
Do GMC Sierra LED headlight bulbs need to be aligned?
The adjustable F1 Series LED bulb shown in this installation should be positioned so the LED chips face left and right inside the factory headlight housing. Correct rotational positioning helps the LED bulb work properly with the factory headlight optics.
Can I install 9012 LED bulbs in factory D5 HID headlights?
No. A factory D5 HID headlight is a different lighting system from a 9012 halogen headlight. The 9012 LED products referenced in this guide are intended for compatible trucks originally equipped with 9012 halogen bulbs.
Can I replace a factory LED Sierra headlight bulb?
Factory LED Sierra headlight assemblies do not use the conventional replaceable 9012 halogen bulb covered by this guide. Do not order a 9012 LED bulb for a truck equipped with a factory integrated LED headlight assembly.
Shop GMC Sierra LED Headlight Upgrades
Have a GMC Sierra equipped with factory 9012 halogen headlights? Compare FUZED LED 9012 headlight bulbs and choose the upgrade that best fits your truck and desired output.
Shop 9012 LED Bulbs Find Bulbs for Your VehicleVehicle lighting can vary by factory configuration and equipment package. Always verify the original bulb and headlight type before ordering.