For the 2018 GMC Acadia, headlight bulb fitment depends on the installed headlight system. Models with halogen headlights use a 9012 bulb for both the low beam and high beam. Models with HID headlights use D3S bulbs for both functions. The fitment data also lists D3S for the low- and high-beam positions without a condition, so confirm the original headlight type and bulb marking before ordering.
Fog light listings include H11 LED and H16 LED options; check the existing fog lamp socket and assembly to determine the correct choice for your Acadia. The front turn signal and parking light use 7444NA, while the rear turn signal uses 7440. Reverse lights use 921.
- Brake, center stop, daytime running, tail, and front and rear side-marker lights are listed as LED.
- License plate and map lights may use 2825 or 98.
- The vanity light uses 6612F.
Always match the replacement to the vehicle’s current lighting equipment, especially when selecting between halogen and HID headlight bulbs.