The Pontiac G6 front and rear turn signal bulbs both require a 3057 size bulb for proper operation. The replacement chart covers 2005 to 2010 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3057 is the specified bulb for both the front and rear turn signals of the Pontiac G6 across the listed model years.
The 3057 follows the ANSI standard, meaning it conforms to a defined set of electrical and physical specifications recognized across the United States and Canada.
It is a dual-filament bulb, which means it contains two separate filaments within a single housing, allowing it to serve two distinct lighting functions at different wattages.
The bulb operates on a 12-volt electrical system, consistent with standard automotive voltage.
The two filaments draw 27 watts and 7 watts respectively, with the higher-wattage filament typically associated with the brighter turn signal or stop function and the lower wattage with a reduced-intensity function.
The 3057 uses a T25 wedge base, a physical form factor that determines how the bulb seats and locks into its socket.
The front and rear turn signal positions on the Pontiac G6 share the same bulb specification for the 2005 and 2010 model years, indicating socket and electrical compatibility across those positions.
Because the 3057 is a dual-filament type, substituting it with a single-filament bulb of similar wattage would not replicate its full intended function in circuits designed for dual-filament operation.