The Pontiac Torrent front turn signal requires 4157NA or 5702AK bulb sizes, while the rear turn signal uses a 3157 bulb size. The replacement chart covers 2006 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 Torrent uses three distinct bulb types across its front and rear turn signal positions: the 4157NA, the 5702AK, and the 3157, all of which share the T25 wedge base form factor and operate at 12V with a 27W/7W dual-filament configuration.
The T25 wedge base is a standardized fitting common in North American automotive lighting, meaning all three bulb types physically seat into the same style of socket despite carrying different part designations.
The dual-filament design in all three bulbs serves two functions within a single housing, with the higher 27W filament typically handling the turn signal flash and the lower 7W filament serving as a running or parking light.
The 4157NA is an ANSI-standardized bulb recognized in both the United States and Canada, and its "NA" suffix denotes natural amber glass, meaning the amber color is produced by the glass itself rather than a coating.
The 3157 is also an ANSI-standardized bulb for the US and Canadian markets, and unlike the 4157NA, it is produced with clear glass, making its amber output dependent on the lens or housing rather than the bulb itself.
The 5702AK is a Sylvania-specific part number rather than an ANSI designation, and it represents a coated amber variant of the 3157 bulb, meaning the amber tint is applied as a surface coating over otherwise clear glass.
For the Pontiac Torrent, the front turn signal position on 2007-2009 models uses the 4157NA, while the 2006 model uses the 5702AK, indicating a change in the front turn signal bulb specification between the 2006 and 2007 model years.
Because the 4157NA and 5702AK both produce amber light through different methods (natural glass versus coating), substituting one for the other may affect color consistency depending on the transparency of the turn signal lens on the vehicle.
The rear turn signal position on the Pontiac Torrent uses the 3157 across all four model years (2006-2009), making it the only position with an unchanged specification throughout the vehicle's production run covered in these data.
Although the 3157 and 4157NA share identical electrical ratings and the same T25 base, they are not unconditionally interchangeable in all positions, as the presence or absence of amber coloring in the bulb itself is a factor in meeting turn signal visibility standards when the housing lens is clear.