What is the low beam headlight bulb size for a 2009 GMC Sierra Denali?

The 2009 GMC Sierra Denali uses a H11 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2009 GMC Sierra Denali?

The high beam bulb size for the 2009 GMC Sierra Denali is 9005 LED.

Why are my 2009 GMC Sierra Denali headlights dim?

Dim headlights on a 2009 GMC Sierra Denali can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H11 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2009 GMC Sierra Denali fog light?

The 2009 GMC Sierra Denali uses a LED Fog Light bulb for the fog light position.

Is the 2009 GMC Sierra Denali single or dual beam?

The 2009 GMC Sierra Denali uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2009 GMC Sierra Denali?

Yes, the 2009 GMC Sierra Denali comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H11 LED LED conversion kit for the low beams.

Does the 2009 GMC Sierra Denali have fog lights?

Yes, the 2009 GMC Sierra Denali takes a LED Fog Light bulb for the fog light position.

How do I change the headlight on a 2009 GMC Sierra Denali?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old H11 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2009 GMC Sierra Denali?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved H11 LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2009 GMC Sierra Denali headlights?

A pair of halogen H11 LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2009 GMC Sierra Denali?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the H11 LED position are available as direct plug-and-play replacements.

Fitment Guaranteed for 2009 GMC Sierra Denali

What Size Bulbs Does a 2009 GMC Sierra Denali Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2009 GMC Sierra Denali Have?

When it comes to nighttime visibility, the 2009 GMC Sierra Denali relies on an arrangement of 13 specialized bulbs. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H11 LED low beam and 9005 LED high beam bulbs for precise light distribution.

Can You Put LED Bulbs in a 2009 GMC Sierra Denali?

For a GMC built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. We recommend starting your upgrade with the H11 LED low beams, as they see the most use. Adding a matching 9005 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the LED Fog Light fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2009 GMC Sierra Denali Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H11 LED	Buy H11 LED →
High Beam	9005 LED	Buy 9005 LED →
Fog Light	LED Fog Light	Buy LED Fog Light →
Brake Light	912	Buy 912 →
Dome Light	212-2	Buy 212-2 →
Side Marker	194	Buy 194 →
Turn Signal Front	4157NA	Buy 4157NA →
License Plate	194	Buy 194 →
Map Light	212-2	Buy 212-2 →
Parking Light	4157NA	Buy 4157NA →
Turn Signal Rear	3047	Buy 3047 →
Reverse Light	3047	Buy 3047 →
Trunk Light	921	Buy 921 →