For the 2014 GMC Sierra 1500, both the low-beam and high-beam headlights use a 9012 bulb. The same 9012 fitment is listed for the daytime running lights, so verify the vehicle’s existing bulb and socket before ordering replacements.
The fog lights use a 5202 LED bulb. Other useful exterior lighting fitments include 7443A for the front turn signals, 7444 for the brake and tail lights, and 7444NA for the rear turn signals. The parking lights use 7443, while rear side markers use 194NA.
For rear and auxiliary lighting, the reverse lights and center stop light use 921 bulbs; the trunk light also uses 921. License plate lighting takes a 2825 bulb, and the vanity light uses 6612F. These listings represent the supplied fitment data for this model year; confirm the bulb number against the original lamp before installation.