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The 2014 GMC Sierra 1500 uses a 9012 headlight bulb size. Replacing headlights is simple and affordable, with each bulb costing about $10 to $20 on average. To change the bulb, start by removing the headlight cover which is secured by a few screws. After unscrewing the cover, you can easily replace the bulb similar to changing a ceiling fan bulb. Once the new bulb is in place, reattach the cover, screw it back on, and test the bulbs to ensure they are working properly.
The GMC Sierra 1500 is equipped with headlight bulbs sized 9012 for high beams and 9012 for low beams.
The headlights are not functioning properly on one side, as both the high and low beams are not working.