Freightliner M2 Tail Light Bulb Size

The Freightliner M2 tail light uses a 1157 bulb size for replacement applications across multiple production generations. The replacement chart covers vehicle data spanning from 2002 to 2024.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2002-2024	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Freightliner M2 uses the 1157 bulb across all listed model years from 2002-2024 for the tail light position.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope to serve two distinct lighting functions from one socket.
The 1157 operates on a 12-volt electrical system and carries a 21W/5W power rating, where the higher wattage filament serves the stop or turn signal function and the lower wattage filament serves the running light function.
The 1157 uses a BAY15d bayonet base, which features two offset pins at different heights on the base to ensure the bulb is seated in the correct rotational orientation, preventing the two filaments from being connected to the wrong circuits.
The 1157 conforms to ANSI standards and is recognized in both the United States and Canada, placing it within a widely distributed specification used across the North American market.
Because the BAY15d base has offset pins, it is not interchangeable with single-filament bayonet bulbs or dual-filament bulbs that use a different pin configuration, such as the BAY15s or BA15d bases.