2025 GMC Sierra 1500 Bulb Sizes

Quick Reference

The 2025 GMC Sierra 1500 generation primarily utilizes integrated LED lighting across most trims and functions. This means that for many lighting components, the "bulb" is not a replaceable unit but rather part of a larger LED assembly. This design enhances durability and longevity, but also means that if an LED fails, the entire housing may need to be replaced. However, for certain functions and lower-tier trims, traditional halogen bulbs may still be present, or there might be variations in LED technology.

For the 2025 model year, GMC has largely transitioned to advanced LED lighting systems as standard or available options on the Sierra 1500. This provides superior illumination, energy efficiency, and a modern aesthetic. Higher trims such as the Denali and AT4 will almost certainly feature full LED lighting throughout, including advanced projector-style LED headlights.

Headlight (Low Beam & High Beam): For most 2025 Sierra 1500 models, the low and high beams are integrated LED units. These are not serviceable as individual bulbs. Some base models or work trucks might still utilize a halogen setup, in which case a single dual-filament H13 (9008) bulb could be used for both low and high beam functions, or separate H11 for low beam and 9005 (HB3) for high beam, but this is becoming increasingly rare. Always check your specific trim level and owner's manual to confirm.

Fog Lights: Similar to the headlights, most 2025 Sierra 1500 models will come with integrated LED fog lights. If a trim level were to still use a halogen bulb, it would commonly be an H11.

Daytime Running Lights (DRL): The DRLs on the 2025 Sierra 1500 are exclusively integrated LED strips or arrays, often forming a signature light design. These are not individually replaceable bulbs.

Front Turn Signal: The front turn signals are integrated LED units on the vast majority of 2025 Sierra 1500 trucks. These provide crisp, instant illumination.

Rear Turn Signal: Like the front, the rear turn signals are typically integrated LED clusters within the taillight assembly.

Brake Light: The brake lights are integrated LED components within the taillight housing, providing bright and fast-acting signaling for safety.

Tail Light: The tail lights on the 2025 Sierra 1500 are predominantly integrated LED designs. These assemblies incorporate the brake and turn signal functions as well.

Reverse Light: While many functions are LED, reverse lights can sometimes be one of the last holdouts for traditional bulbs on some lower trims, potentially a 921 or 7440 bulb, but increasingly these are also integrated LEDs. Higher trims will almost certainly feature LED reverse lights.

License Plate Light: The license plate lights are fully integrated LED units on the 2025 Sierra 1500, offering bright, white illumination.

Side Marker Lights: These are also integrated LED units, designed for longevity and maintenance-free operation.

Dome/Map Lights: The interior lighting, including dome and map lights, will generally be integrated LED units across all trims, providing a modern and efficient cabin ambiance.

LED vs Halogen Upgrade Considerations

Given that the 2025 GMC Sierra 1500 heavily features integrated LED lighting, traditional "upgrades" from halogen to LED are largely a thing of the past for many functions. For the few remaining halogen applications (if any still exist on base models), upgrading to aftermarket LED bulbs would require careful consideration. CANBUS errors are a common issue, as the truck