GMC Savana brake bulb specifications include 3157 and 2057 sizes for standard brake applications, with 912 size for center high mount stop light and 3157 for outer brake positions. The replacement chart covers 1996 through 2024 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC Savana uses the 3157 bulb for its brake lights across the 2003-2024 model years, making it the most consistently specified bulb type in these specifications.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a high-intensity filament of 27W and a low-intensity filament of 7W, conforming to ANSI standards for the US and Canada.
Its dual-filament design allows a single bulb to serve both brake and running light functions, with the higher-wattage filament activating under braking.
The 1996-2002 GMC Savana brake light positions use the 2057 bulb instead of the 3157, indicating a fitment difference between earlier and later production years.
The 2057 is also a dual-filament bulb, but it uses a BAY15d bayonet base rather than the wedge-style base of the 3157, making the two bulbs physically non-interchangeable despite their similar wattage ratings of 26.9W/8W at 12V.
The 2057 is noted as a brighter variant of the 1157, sharing the same base type while offering higher output on its primary filament.
The center high mount stop light on the GMC Savana uses the 912 bulb across all model years covered in the specifications, from 1996 through 2024.
The 912 is a single-filament T15 wedge bulb rated at 12V and 12W, conforming to ANSI standards, and is a variant of the 921 bulb within the same wedge family.
The 912 and 3157 both use wedge-style bases but belong to different size classes, T15 and T25 respectively, and are not interchangeable with each other.
The 2017-2018 GMC Savana carries an additional outer brake light position specifying the 3157 bulb, a sub-position not listed for other model years in these specifications.