Nissan TITAN Turn Signal Bulb Size

Additional Notes

• The T25 wedge form factor is the most frequently specified bulb body type across the Nissan TITAN's turn signal history, appearing in the front position from 2004-2015 and in the rear position across multiple model years, represented by types such as the 3157, 3157NA, 3457, 3057, and 3156.
• The 7444NA and 7443NA are both T20 dual-filament wedge bulbs rated at 12V, 21W/5W with natural amber glass. The 7444NA replaced the 7443NA in the front turn signal position starting with the 2019 model year, with the 7444NA continuing through 2022-2024.
• Natural amber glass, denoted by the "NA" suffix, is a factory-tinted construction that produces an amber output without the use of an amber-coated or amber-housing lens. This suffix appears on the 3157NA, 7443NA, 7444NA, and 7440NA types listed in these specifications.
• The 3457 and 3157NA share the same T25 body and the same 12V, 27W/7W dual-filament rating, yet they are listed as distinct part numbers. The 3157NA carries natural amber glass while the 3457 does not, making them non-interchangeable where lens color is a factor in meeting signaling regulations.
• The Nissan TITAN (2022) is the only model year in these specifications where the front and rear turn signals use bulbs from different filament configurations: the front uses the dual-filament 7444NA while the rear uses the single-filament 7440NA, both in the T20 form factor.
• The 2356 is a dual-filament bulb with a BAY15d bayonet base, a base type that is physically incompatible with the wedge-base sockets used by the T20 and T25 bulbs also listed in these specifications. It appears in the rear turn signal position for the 2010 and 2014 model years.
• The 2456 is a festoon-style bulb rated at 12V with no wattage specified in these specifications. It is listed for the rear turn signal across multiple model years spanning 2004-2015, and its festoon construction differs fundamentally from the wedge and bayonet base types also present in the rear position across other years.
• The rear turn signal position on the Nissan TITAN shows the widest variation in bulb types of any position in these specifications, drawing from at least five distinct bulb families: T20 wedge, T25 wedge, festoon, BAY15d bayonet, and single-filament T25, which means rear bulbs are not interchangeable across model years without confirming the exact socket type.