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Used for: Fog Light Bulb Front
Used for: Fog Light Bulb Front
Used for: Headlight Bulb High Beam, Headlight Bulb High Beam and Low Beam(with HID headlights), Headlight Bulb Low Beam
Used for: Headlight Bulb High Beam and Low Beam(with halogen headlights)
Used for: Back Up Reverse Light Bulb
Used for: License Plate Light Bulb, Map Light Bulb
Used for: License Plate Light Bulb, Map Light Bulb
Used for: Parking Light Bulb, Turn Signal Light Bulb Front
Used for: Turn Signal Light Bulb Rear
Used for: Vanity Mirror Light Bulb
The 2018 GMC Acadia uses different bulb types depending on the lighting position, so this page helps you verify the correct bulb size before you buy. Whether you are replacing a headlight, tail light, reverse light, or interior lamp, matching the bulb to the exact location is the easiest way to avoid fitment problems.
On this 2018 GMC Acadia bulb size guide, you can check the listed bulb type by lighting function and compare it with your vehicle’s equipment. That matters because some positions use LED assemblies, while others use replaceable bulbs such as 921, 7444NA, 7440, 2825/98, 6612F, D3S, H11 LED, H16 LED, or 9012 depending on trim and lighting setup.
Fitment can vary by market, trim, body style, and lighting package, so always confirm what is installed on your Acadia before ordering replacement parts. This is especially important for headlight and fog light applications, since halogen and HID/LED-equipped vehicles do not use the same bulbs. If you are considering an aftermarket LED conversion, make sure the bulb base, connector, beam pattern, and housing compatibility are correct for your specific setup. The safest approach is to remove the old bulb and compare it directly before purchase, especially for exterior lights where a small difference can affect proper operation or cause a warning message.
The low beam headlight bulb listed for the 2018 GMC Acadia is D3S on HID-equipped models. If your Acadia has halogen headlights, the headlight setup uses 9012 for high beam and low beam.
For HID headlight systems, the high beam bulb is D3S. For halogen headlight systems, the vehicle uses 9012 for both high beam and low beam.
Yes, the tail light bulb listing for this model is LED. In many cases, that means the light is part of an LED assembly rather than a simple replaceable bulb.
The back up reverse light bulb size listed is 921.
The front turn signal light bulb is 7444NA.
The parking light bulb listed for the 2018 GMC Acadia is 7444NA.
The rear turn signal light bulb is 7440.
The license plate light bulb sizes listed are 2825 and 98.
The map light bulb sizes listed are 2825 and 98.
The front fog light bulb listing is H11 LED or H16 LED, depending on the vehicle’s lighting package and market.
The daytime running light bulb is listed as LED. On many vehicles, that means the DRL is integrated into the lamp assembly rather than using a standard replaceable bulb.
Yes. Trim, lighting package, market, and body style can change the bulb type used in certain positions, especially headlights and fog lights.
Yes. Checking the installed bulb is the best way to confirm fitment, especially if your Acadia has been modified or if you are unsure whether it has halogen or HID headlights.
You can consider aftermarket LED conversions, but fitment and beam pattern must be checked carefully. The bulb may fit physically, but it still needs to work correctly in the housing.