The headlight bulb configuration for most 2011 GMC Sierra 1500 trucks uses H11 for the low beams and 9005 for the high beams, with H11 commonly used for front fog lights when equipped.
In more detail, the 2011 Sierra—with halogen headlights on most trims—typically employs H11 low-beam bulbs in either projector or reflector housings and a 9005 bulb for the high beams. The exact setup can vary by trim level and optional equipment, so it’s important to verify with the owner's manual or by checking the door jamb sticker and the bulb currently installed in your vehicle.
Common bulb sizes by function
Here are the sizes you’ll most often encounter when shopping for replacements for a 2011 Sierra with standard halogen headlights.
- Low beam: H11
- High beam: 9005 (HB3)
- Front fog lights (if equipped): H11
These sizes cover the majority of 2011 Sierra models with halogen headlights. If your vehicle has different equipment (such as factory HID or certain aftermarket upgrades), verify against your manual or a parts specialist.
How to confirm your exact bulb type
To ensure you buy the correct bulb, use a quick verification process before purchasing or swapping bulbs.
- Consult the owner’s manual or the OEM bulb chart for your exact trim and build.
- Check the label on the current bulb base or the headlight housing for the bulb type.
- Inspect the door jamb sticker near the driver's door for bulb size information.
After confirming, follow proper bulb replacement steps and test the headlights to ensure proper function and alignment.
Summary
For most 2011 GMC Sierra models, expect H11 low beams and 9005 high beams, with H11 fog lights where equipped. Always verify with manual, VIN-specific parts info, or a professional if you encounter HID or aftermarket lighting configurations.