The GMC Acadia brake light requires a 7440 bulb size for proper installation and function within the rear lighting assembly. Data provided for the specific bulb requirements covers the range from 2013 to 2016.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440 is the sole bulb type listed across all brake light positions in the GMC Acadia specifications provided.
The 7440 follows the ANSI standard, making it applicable for vehicles sold in the United States and Canada.
As a single-filament wedge bulb, the 7440 serves dedicated brake light functions rather than combined stop/tail duties, which typically require a dual-filament design.
The 7440 operates at 12 volts and 21 watts, which is standard for automotive brake lighting applications.
The T20 designation refers to the wedge base form factor of the 7440, a classification that governs physical fitment into the socket.
The GMC Acadia (2013-2016) uses the 7440 for its brake bulb position, reflecting a consistent specification across four model years.
The Outer Brake position on the 2017-2019 Acadia also specifies the 7440, indicating that the redesigned second-generation model retained the same bulb type for this function.
The 7440 and the 7443 share the same T20 wedge base, but the 7443 is a dual-filament variant. These two types are not interchangeable in sockets designed exclusively for single-filament operation.