The Freightliner Cascadia high beam and low beam headlight bulbs both utilize an H11 size. The replacement chart covers vehicle production spanning 2008 to 2022.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Freightliner Cascadia uses the H11 bulb type for both high beam and low beam headlights across all model years from 2008-2022.
The H11 is a single-filament halogen bulb that operates within the PGJ19-2 base family, meaning it seats into a twist-lock connector rather than a screw or bayonet mount.
Because the high beam and low beam positions share the same H11 specification, both functions rely on separate individual bulbs rather than a dual-filament unit handling both tasks within a single housing.
The H11 bulb is not interchangeable with the closely related H8 or H9 types despite sharing the same physical base, as those variants differ in wattage and are calibrated for different output levels.
H11 bulbs are available in standard halogen, high-output halogen, and HID or LED retrofit configurations, though the factory specification references only the bulb size designation and not a specific technology type.
The consistent H11 fitment across both beam positions means a single bulb part number can serve as a replacement for either the high beam or low beam socket on any Cascadia from 2008-2022.
Installers should note that while H11 and H16 bulbs share a physically similar base, they are not rated identically and substituting one for the other is not supported by the factory specification.