What is the low beam headlight bulb size for a 2018 GMC Yukon XL?

The 2018 GMC Yukon XL uses a H11 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2018 GMC Yukon XL?

The high beam bulb size for the 2018 GMC Yukon XL is 9005.

Why are my 2018 GMC Yukon XL headlights dim?

Dim headlights on a 2018 GMC Yukon XL 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 conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 GMC Yukon XL fog light?

The 2018 GMC Yukon XL typically does not come with factory fog lights in all trim levels. If your vehicle is equipped with them, check the manual as sizes can vary by trim.

Is the 2018 GMC Yukon XL single or dual beam?

The 2018 GMC Yukon XL uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2018 GMC Yukon XL?

Yes, the 2018 GMC Yukon XL comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H11 LED conversion kit for the low beams.

Did the 2018 GMC Yukon XL change headlight bulb sizes from the previous year?

Yes — the 2018 GMC Yukon XL uses different bulb sizes than the 2017 model. The 2018 generation introduced this bulb configuration.

Is the 2018 GMC Yukon XL the first or last year to use H11 bulbs?

The 2018 GMC Yukon XL is the only year in the 2018 generation to use the H11 bulb for the low beam headlight.

How do I change the headlight on a 2018 GMC Yukon XL?

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 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 2018 GMC Yukon XL?

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 kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2018 GMC Yukon XL headlights?

A pair of halogen H11 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 2018 GMC Yukon XL?

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 position are available as direct plug-and-play replacements.

The 2018 GMC Yukon XL has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2018 GMC Yukon XL

What Size Bulbs Does a 2018 GMC Yukon XL Use?

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

Installation Difficulty

Moderate (Dust covers often present)

Est. Replacement Cost

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

What Lighting System Does the 2018 GMC Yukon XL Have?

Lighting on the 2018 GMC Yukon XL is managed by a total of 4 bulbs, covering everything from primary headlights to signal indicators. It features a standard lighting system powered by a dual-bulb halogen configuration using separate H11 low beam and 9005 high beam bulbs for precise light distribution.

Can You Put LED Bulbs in a 2018 GMC Yukon XL?

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 low beams, as they see the most use. Adding a matching 9005 LED kit later will complete the look and ensure consistent lighting performance.

2018 GMC Yukon XL Bulb Size Chart

Position	Bulb Size	Shop
High Beam	9005	Buy 9005 →
Low Beam	H11	Buy H11 →
Reverse Light	921	Buy 921 →
License Plate	W5W	Buy W5W →

How do the 2018 GMC Yukon XL's bulbs compare to other years?

The 2018 GMC Yukon XL changed bulb sizes from 2017. The previous model year used a different configuration.

The 2019 model switched to a different bulb configuration.

This bulb configuration covers the 2018 model years. ← 2017 2019 →

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Other Yukon XL Years

2020 2019 2017 2016 2015 2008 2007 2006 2005 2004 2003 2002 2001 2000

Other Vehicles That Use H11 Bulbs

2022 Chevrolet Colorado 2022 Chevrolet Silverado 1500 2022 Ford Edge 2022 Ford Expedition 2022 Ford F-150 2022 Ford Transit Connect

H11 Comparisons

9005 vs H11 9006 vs H11 9012 vs H11 H11 vs H16 H11 vs H7