The Pontiac G6 brake light requires a 3057 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2005 to 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac G6 uses the 3057 bulb for brake lights across the 2005-2010 model years. This is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament.
The dual-filament design of the 3057 allows it to serve both a brighter stop function and a dimmer running light function within a single bulb housing.
The center high mount stop light on the Pontiac G6 uses the 912 bulb across the 2005-2010 model years. This is an ANSI-standard single-filament wedge bulb in the T15 form factor, rated at 12V and 12W.
The 912 bulb is a variant of the 921. While the two share the same T15 wedge base and physical form factor, they differ in wattage, and substituting one for the other may affect light output or circuit load.
The 3057 and 912 bulbs both conform to ANSI standards applicable in the United States and Canada, indicating consistent fitment expectations across those markets.
The T25 designation of the 3057 refers to its wedge base size, which is larger than the T15 base used by the 912. The two bulbs are not interchangeable with each other due to this physical difference.