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GMC Yukon XL 2018 Bulb Size
Bulb size chart
9006 LED Bulbs
Used for: Fog Light Bulb Front
9005 Bulbs
Used for: Headlight Bulb High Beam
H11 Bulbs
Used for: Headlight Bulb Low Beam(with halogen headlights)
D3S Bulbs
Used for: Headlight Bulb Low Beam(with HID headlights)
921 Bulbs
Used for: Back Up Reverse Light Bulb
2825 Bulbs
Used for: License Plate Light Bulb
6612F Bulbs
Used for: Vanity Mirror Light Bulb
This page covers the 2018 GMC Yukon XL and helps you verify the correct bulb size by lighting position. Whether you are replacing a headlight, reverse light, license plate light, or vanity mirror bulb, matching the bulb to the exact location is the safest way to get the right fit.
The Yukon XL can use different bulbs depending on trim, lighting package, and market. That means the low beam, fog light, and other exterior lamps may not be the same on every vehicle, so it is important to confirm the bulb type before ordering replacements.
For the 2018 GMC Yukon XL, fitment can vary between halogen and HID-equipped models, and some trucks may also have different lighting setups because of trim level or factory options. The low beam bulb is H11 on halogen headlights and D3S on HID headlights, while the front fog light bulb is listed as 9006 LED for the optional setup shown here. If your Yukon XL has been modified with aftermarket LED or HID conversion kits, the original bulb chart may no longer match what is installed. Before buying, check the bulb already in the housing, compare the connector and base style, and confirm whether your vehicle uses factory halogen, factory HID, or a converted setup.
FAQ
What bulb size does the 2018 GMC Yukon XL use for the high beam headlights?
The high beam headlight bulb size listed for the 2018 GMC Yukon XL is 9005.
What is the low beam bulb size on a 2018 GMC Yukon XL with halogen headlights?
For halogen headlights, the low beam bulb size is H11.
What low beam bulb does the 2018 GMC Yukon XL use with HID headlights?
For HID-equipped headlights, the low beam bulb size is D3S.
What bulb is used for the front fog lights on this Yukon XL?
The front fog light bulb listed here is 9006 LED, which applies to the optional fog light setup shown on this page.
What size bulb fits the reverse lights on a 2018 GMC Yukon XL?
The back up reverse light bulb size is 921.
What bulb is used for the license plate lights?
The license plate light bulb size listed for this vehicle is 2825.
What bulb fits the vanity mirror light?
The vanity mirror light bulb size is 6612F.
Why does my 2018 GMC Yukon XL not match every bulb listed here?
Trim level, lighting package, body style, and market can change the bulb used in a specific position. The same year and model can have different headlight or fog light setups.
How can I tell whether my Yukon XL has halogen or HID low beams?
Check the headlight housing and the bulb already installed. Factory HID systems use D3S low beam bulbs, while halogen systems use H11 low beam bulbs.
Should I trust the bulb size list if my truck has aftermarket lights?
Not always. Aftermarket LED or HID conversions can change the bulb type from the original factory specification, so it is best to inspect the installed bulb before buying replacements.
Can I replace a single bulb without changing the other side?
Yes, but many owners replace bulbs in pairs for more even brightness and color, especially for headlights.
What is the best way to avoid buying the wrong bulb for a 2018 GMC Yukon XL?
Use the bulb position on the vehicle, confirm whether the truck has halogen or HID headlights, and compare the old bulb to the replacement before installation.