The most common configuration for a 2011 GMC Acadia is halogen headlights using H11 low beams and 9005 high beams. Some higher-trim models offered optional HID headlights with ballast. The exact bulb type depends on your trim level and whether your vehicle was equipped with the HID upgrade.
Halogen headlights
If your Acadia came with the standard lighting setup, this is the bulb configuration you’ll typically encounter.
- Low beam: H11
- High beam: 9005 (HB3)
For most base and mid-range trims, halogen projectors or reflectors were paired with these bulbs. Always verify by checking the bulb itself or your owner's manual if you’re unsure about your specific build date or package.
High-intensity discharge headlights (HID)
Some higher-end trims offered HID projector headlights as an upgrade. If your Acadia has HID, the system uses HID bulbs with a ballast. The exact bulb code can vary by production date and package, so check the label on the ballast or refer to the owner's manual to confirm.
- Bulb type: HID bulbs with ballast (exact bulb code may be D2S/D3S or similar, depending on the production date and trim)
Because HID configurations are not universal across all 2011 Acadia models, it’s important to identify which headlight system your vehicle uses—consult the vehicle’s documentation or a parts specialist if you’re unsure.
How to confirm your bulb type
Open the hood and inspect the headlight assembly label, refer to the owner’s manual, or ask a dealer/auto parts professional. If you’re replacing a bulb yourself, you can also remove the bulb (carefully, with the ignition off) and compare it to the known bulb shapes and markings.
Summary
The 2011 GMC Acadia typically uses halogen headlights with H11 low beams and 9005 high beams. An HID option was available on higher trims, using HID bulbs with ballast, with the exact bulb code varying by model year and package. When in doubt, verify with the owner’s manual, check the ballast label, or consult a parts professional to ensure you get the correct bulbs for your specific vehicle.