The fog light bulb for a 2011 GMC Sierra is an H11 bulb.
Beyond the size, this article explains the typical bulb type, where it’s located, and how to replace it. Models can vary by trim or aftermarket setups, so it’s wise to verify with your owner’s manual or parts diagram for your exact configuration.
Bulb type and compatibility
Key facts about the fog light bulb size and compatibility for the 2011 Sierra.
- The factory fog lights on most 2011 GMC Sierra models use an H11 bulb (12V, 55W).
- H11 bulbs are the common standard for many GM fog light housings and fit the Sierra’s fog light sockets.
- Always confirm the exact bulb by checking the owner’s manual, dealership service data, or a reputable parts catalog, as trims or aftermarket setups can differ.
- Some trims or aftermarket assemblies can conceivably use alternative bulbs, but H11 is the typical choice for US-spec 2011 Sierra fog lights.
In practice, most owners will find the correct replacement listed as "H11 12V 55W" for the 2011 Sierra fog lights. If you encounter a different bulb type, verify your exact trim or consult the dealer.
How to replace the fog light bulb
Follow these steps to replace an H11 fog light bulb on a 2011 GMC Sierra. This guide covers common access paths and safety tips.
- Park the vehicle on a level surface, turn off the engine, and set the parking brake. Open the hood and locate the fog light housing behind the bumper.
- Gain access to the bulb by removing the lower bumper splash shield or reaching through the wheel well to reach the back of the fog light assembly.
- Disconnect the electrical connector from the back of the bulb by pressing the tab and pulling straight out.
- Remove the old bulb by rotating the retaining ring or bulb counterclockwise (depending on your assembly) and carefully pull the bulb out.
- Install the new H11 bulb, reattach any retaining ring or clip, reconnect the wiring harness, and test the fog light before reassembling the trim.
After replacing, ensure the housing cover and bumper are properly secured. If the fog light still doesn’t illuminate, check the fuse, wiring, and any related components before diagnosing further.
Additional considerations
Note that some trims or aftermarket fog light assemblies may differ, so always verify with the factory diagram for your exact Sierra configuration. If your setup is aftermarket, the bulb type could vary.
Summary: For the 2011 GMC Sierra, the fog light bulb is typically an H11 12V 55W bulb. Replacement involves gaining access behind the bumper, disconnecting the harness, removing the old bulb, and installing a new H11 bulb, then testing. Confirm your exact trim if you encounter any mismatch.
Do I need H11 or 9005?
H11 bulbs are designed for use as low beam headlights, while 9005 bulbs are typically used for high beams. This results in a higher brightness level for the 9005 bulbs compared to the H11 bulbs.
Can I use H11 for fog lights?
H11 LED BULBS | HEADLIGHT AND FOG LIGHT BULB REPLACEMENTS
Upgrading your vehicle to H11 LED Bulbs significantly increases the light output of your headlights or fog lights.
What is the fog light bulb number?
H11 is one of the most common bulb sizes and is used for high beam, low beam, and fog lights by nearly every car manufacturer.
What bulb does a 2011 Silverado take?
Chevrolet Silverado 1500 (2007-2013) Bulb Size Chart
| Headlights (Low Beam) | H11 (H8 H9) |
|---|---|
| Headlights (High Beam) | 9005 (HB3) |
| Front Fog Lights | 5202 (5201) |
| Brake Light (Rear) | 3157 (3156) |
| Brake Light (High-Mounted) | T15 (912 921) |