For the 2021 GMC Terrain, headlight bulb fitment depends on the factory headlight type. Models with HID headlights use D5S bulbs for both the low beam and high beam. Models with LED headlights use integrated LED lighting for both functions rather than a listed replaceable bulb.
Fog light fitment is listed as H11 LED or H16 LED; verify the application before ordering. The front turn signal and parking light use 7444NA. Rear lighting also varies with the headlight configuration: HID-equipped models use 7440R brake light and 7440 rear turn signal bulbs, while LED-headlight models use LED lighting for both.
- Reverse light: 921
- Center stop, daytime running, side marker, and tail lights: LED
- License plate: 2825 or 98
Confirm whether the Terrain has HID or LED headlights, and check the original fog and license plate bulb before purchasing.