For most 2015 GMC Sierra 1500 models with standard halogen headlights, the low beams use H11 bulbs and the high beams use 9005 bulbs (HB3). Fog lights, if equipped, typically use H11 as well. If your Sierra has factory HID headlights, the bulb types are different and depend on the exact headlight assembly.
The 2015 Sierra 1500 offered both halogen projector headlights and optional HID headlights, plus fog lights. The bulb type you need depends on your specific headlight configuration. The guide below covers the common setups and how to identify yours, along with tips for replacement.
Standard halogen headlights (most common)
The majority of 2015 Sierra 1500 pickups with halogen headlights use separate bulbs for the low and high beams, with fog lights usually sharing the low-beam circuit where applicable.
- Low beam bulb: H11
- High beam bulb: 9005 (HB3)
- Fog light bulb (if equipped): H11
When replacing bulbs, verify by inspecting the current bulb or checking the owner's manual. Some trims may differ, so confirm with your specific VIN or headlight assembly.
Optional HID headlights (if equipped)
Some 2015 Sierra 1500 models came with factory HID headlights, which use ballast-assisted bulbs rather than standard halogen bulbs. The low-beam bulb type is typically D1S or D2S, depending on the exact headlight assembly, while the high-beam configuration can vary and may be integrated with the HID system or use a separate bulb in some designs. Confirm the exact bulb type for your specific build.
- Low beam HID bulb: D1S or D2S (check your unit)
- High beam: often integrated with HID system or may use a separate bulb depending on the setup
Note: HID systems require compatible bulbs and ballast. If you’re unsure, consult your dealer or a qualified technician.
Additional considerations
Bulb type can vary by trim and factory options. Always verify with the vehicle’s manual or by inspecting the current bulb or headlight label. When replacing bulbs yourself, handle bulbs with clean gloves or a cloth to avoid oils from your skin.
Summary: For a 2015 GMC Sierra 1500, the typical halogen setup uses H11 for low beams and 9005 for high beams, with H11 for fog lights. If your truck has HID headlights, expect D1S or D2S for the low beams and follow the vehicle’s exact configuration for high beams. Always confirm by checking the bulb or the owner’s manual.