The GMC Canyon tail light utilizes 3057 and 7443 bulb sizes for the rear lighting components. Provided information covers the span of time from 2004 through 2020.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC Canyon outer tail light uses two distinct bulb types across its production span, with the 3057 fitted to the 2004-2012 model years and the 7443 fitted to the 2015-2020 model years.
Both the 7443 and 3057 are ANSI-standardized dual-filament wedge bulbs rated at 12 volts, making them compatible with standard automotive electrical systems in the United States and Canada.
The 7443 is a T20 wedge bulb rated at 21W on its high-intensity filament and 5W on its low-intensity filament, functions that correspond respectively to brake/turn signaling and running light operation in tail light assemblies.
The 3057 is a T25 wedge bulb rated at 27W on its high-intensity filament and 7W on its low-intensity filament, delivering higher wattage output on both filaments compared to the 7443.
Although both bulbs share a dual-filament wedge construction, the T20 and T25 designations indicate different base sizes, meaning the 7443 and 3057 are not physically interchangeable with each other.
The wattage difference between the two bulbs is a relevant fitment consideration, as substituting a higher-wattage bulb such as the 3057 into a socket rated for the lower-wattage 7443 could exceed the socket's thermal tolerance.
The GMC Canyon (2015-2020) outer tail light position uses the 7443 consistently across all listed model years in that range, indicating no mid-cycle bulb specification change during that generation.