Pontiac G6 Back Up Light Bulb Size

The Pontiac G6 back up light requires a bulb size of 3057 for the rear 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.

Bulb Size by Year Range

Years	Bulb Size
2010	3057
2005	3057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057

Other Locations

Additional Notes

The 3057 is the sole bulb size listed for the Pontiac G6 backup light across both available model years, 2005 and 2010.
The 3057 follows the ANSI standard, meaning it conforms to a recognized North American specification used in both the United States and Canada.
It is a dual-filament bulb, carrying two separate filaments within a single envelope rated at 27W and 7W respectively, allowing it to serve more than one lighting function depending on circuit activation.
The T25 designation refers to the wedge-style base of the bulb, which measures 25 units in the T-series sizing convention, where each unit equals one-eighth of an inch across the widest point of the glass envelope.
The bulb operates on a 12V electrical system, consistent with standard automotive voltage.
Because the 3057 is a dual-filament type, substituting it with a single-filament bulb of otherwise similar wattage would not replicate its full electrical behavior in circuits that rely on both filaments.