Pontiac G5 front turn signal bulbs use 3457NA size while rear turn signal bulbs use 3157 size. The replacement chart covers 2007 through 2009 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac G5 uses two distinct bulb types across its turn signal positions for the 2007-2009 model years: the 3457NA for the front and the 3157 for the rear.
Both the 3457NA and 3157 are ANSI-standardized dual-filament wedge bulbs of the T25 type, rated at 12V with a 27W/7W power split between their two filaments.
The dual-filament design in both bulbs allows a single unit to serve two lighting functions, typically combining turn signal and parking light operation within one housing.
The 3457NA used in the front turn signal position of the Pontiac G5 features natural amber glass, which produces an amber output without requiring an amber-tinted lens.
The 3157 used in the rear position lacks the natural amber glass of the 3457NA, meaning the amber color in rear applications is typically produced by the lens rather than the bulb itself.
Although the 3457NA and 3157 share the same T25 wedge base, voltage rating, and wattage, the natural amber coating on the 3457NA makes it position-specific and not a direct substitute for the 3157 in applications requiring a clear bulb output.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized performance and fitment tolerances across those markets.