The Pontiac G3 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2009 to 2010 model year data and specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to handle both high and low beam functions independently.
Operating at 12 volts with a 60W filament for high beam and a 55W filament for low beam, the 9003 draws more power during high beam use than low beam use.
The 9003 uses a P43t base, which is a standardized bayonet-style mount that physically determines fitment compatibility across vehicles using this bulb type.
The 9003 carries ANSI standardization for the US and Canadian markets, meaning its electrical and physical specifications conform to a defined regulatory standard in those regions.
The Pontiac G3 uses the 9003 bulb for both the high beam and low beam headlight positions across the 2009-2010 model years, with no separate bulb type assigned to each function.
Because the 9003 serves both beam functions in the G3, the high and low beams are housed within a single bulb unit rather than in separate bulb assemblies.
The 9003 is sometimes cross-referenced with the H4 bulb type used in international markets; however, the 9003 designation reflects the ANSI-specific classification applicable to North American fitment.