Volvo VNM front and rear turn signal bulbs utilize 3157NA and 3157 sizes respectively, with the front bulb featuring a distinct size designation. The replacement chart covers 2005 through 2018 model years and contains bulb size specifications for vehicle production.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo VNM front turn signal position takes the 3157NA bulb across all listed model years, spanning 2005-2018.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, conforming to ANSI standards applicable in both the United States and Canada.
The "NA" suffix on the 3157NA denotes a natural amber glass envelope, which produces an amber output directly from the glass rather than relying on an amber-coated or clear lens housing to filter the light color.
The Volvo VNM rear turn signal position takes the 3157 bulb for model years 2011-2018.
The 3157 shares the same T25 wedge base, dual-filament design, 12V operating voltage, and 27W/7W power ratings as the 3157NA, with the sole distinction being its clear glass envelope rather than natural amber glass.
Because the 3157 and 3157NA share the same base type and electrical ratings, they are physically interchangeable in the socket, though substituting one for the other affects whether the amber color is produced by the bulb itself or by the lens assembly.
The dual-filament design of both bulbs allows a single socket to serve two lighting functions, typically combining a higher-wattage turn signal or brake function with a lower-wattage running light function.
The front and rear turn signal positions on the Volvo VNM use different bulb variants for the same model years where both are listed, with the front requiring the amber-glass 3157NA and the rear requiring the clear-glass 3157.