For the 2021 GMC Acadia, headlight bulb fitment depends on the factory headlight system. Models with halogen headlights use 9012 bulbs for both the low beam and high beam. Models with HID headlights use D3S bulbs for both functions. Some Acadias are listed with factory LED low- and high-beam lighting, so confirm the headlight type before ordering a replacement.
Fog light listings include H11 LED and H16 LED options, depending on the vehicle configuration. The front turn signal and parking light use 7444NA, while the rear turn signal uses 7440. Reverse lights use 921 bulbs.
- Brake, center stop, daytime running, tail, and side-marker lights are listed as LED.
- License plate and map lights may use 2825 or 98 bulbs.
- The dome light uses 12961, and the vanity light uses 6612F.