If both headlights on Your 2015 GMC Acadia stop functioning at the same time, it's probably the fuse for the headlights, which is going to be located in the engine compartment fuse box. Check that first. If it's not blown, then the next thing is to go ahead and swap in some new bulbs. You'll need 9012s if You're going with halogens, or D3S ones if You've got LEDs; both are combination high and low beam. If You find that the lights still don't function after bulbs --- keep the new ones, as You'll need them eventually, but now You should suspect the ballasts; water can seep in and corrode these, though it's somewhat odd to have it happen to both at once. I'd actually start suspecting the interior mechanical light switch at this point.
I’m almost 2 months into owning a 2015 Acadia. My Headlights and Fog lights are out. The “halo” lights still work. I hear a clicking sound when turning the switch but they still do not come on. Any help or advice?
Johnny G
July 16, 2020
Some of the reasons why the headlights won't work on the 2015 gmc acadia are due to a bad fuse or a blown bulb.
Stef
July 10, 2023
All of my lights are working fine but the hi/low beam lights are not. We tried changing the fuses and rely switches and that did not work , do not know what to try next , should I change both head light bulb?
Both my hi/low beam headlights are out check everything what else could it be
Stacy
November 5, 2022
Mine happened a week ago and it was bad battery. I also changed the bulbs as they looked bad as well.
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