Buick LaCrosse 2012 Bulb Size
Bulb size chart
This 2012 Buick LaCrosse bulb size guide helps you verify the correct bulb by lighting position, so you can replace the right lamp without guessing. Whether you are changing an exterior signal bulb, a reverse light, or an interior courtesy light, this page is organized to make fitment checks faster and easier.
Because the LaCrosse could be equipped with different lighting setups, the bulb chart is best used as a position-by-position reference. That is especially useful for owners comparing halogen and HID headlight systems, or checking whether a specific trim uses LED rear lighting and different front lighting components.
For the best fit, always confirm the trim, lighting package, and body style before ordering parts, since Buick used different bulb types on some versions of the 2012 LaCrosse. Halogen and LED setups are not interchangeable in every location, and aftermarket LED conversions may require additional adapters, resistors, or housings to work correctly. If you are replacing a bulb that has failed, it is smart to remove the installed bulb first and match the base and markings before buying a replacement. This is especially important for items like the fog lights, daytime running lights, and headlamps, where the correct bulb depends on the exact factory configuration.
FAQ
What bulb does the low beam use on a 2012 Buick LaCrosse?
The low beam headlight bulb is H11 on the listed halogen headlight setup. Some versions may use a different headlight system, so verify the installed parts before ordering.
What bulb is used for the high beam on this model?
The high beam bulb is H9 on the 2012 Buick LaCrosse with the halogen headlight configuration.
Does the 2012 Buick LaCrosse use a different bulb for HID headlights?
Yes. For the HID headlight setup, the headlight bulb listed is D1S for the high beam and low beam combination. This is different from the halogen H11 and H9 setup.
What is the reverse light bulb size?
The back up reverse light bulb is 921.
What bulbs are used for the license plate lights?
The license plate light bulb sizes listed are 2825 and 98.
Which bulb fits the dome light and interior courtesy lights?
The dome light bulb, interior door light bulb, and several other interior lamps use 2825 or 98 on this page.
What bulb does the glove box light use?
The glove box light bulb is listed as 194 or 7441.
What are the trunk and stepwell light bulb sizes?
The trunk or cargo area light and the stepwell light bulb both use 194 or 7441.
What bulb is used for the front turn signal on the 2012 Buick LaCrosse?
The front turn signal light bulb is 3757A.
What bulb fits the rear turn signal and rear side marker?
The rear turn signal light bulb is 3757A, and the rear side marker light bulb is listed as LED on this page.
What bulb is used for the front parking light and front side marker?
The front parking light bulb and front side marker light bulb are both 3757A.
What is the fog light bulb size?
The front fog light bulb is listed as H11 LED or H16 LED, depending on the exact setup and conversion used.
What daytime running light bulb does the halogen headlight version use?
For models with halogen headlights, the daytime running light bulb is listed as H11 LED or H16 LED.
What daytime running light bulb does the HID headlight version use?
For models with HID headlights, the daytime running light bulb is listed as 3157.
Should I check the installed bulb before buying a replacement?
Yes. Checking the installed bulb is the safest way to confirm fitment, especially on the 2012 Buick LaCrosse because trim and lighting package differences can change the correct bulb in some positions.