Most Freightliner Cascadia headlamps use an H13 dual-filament bulb (also known as 9008/HB2) for the main low- and high-beam function in the factory headlights. However, the exact bulb type can vary by year, trim, and headlamp design.
Because the Cascadia has evolved across generations, some configurations may use different bases such as H4 (9003) or separate low/high bulbs (for example 9005 and 9006) in certain headlamp assemblies. The most reliable way to know for your specific truck is to consult the owner's manual, inspect the bulb markings, or contact a Freightliner dealer for the exact specification.
Common headlight bulb configurations by Cascadia year
These are the configurations you might encounter depending on the Cascadia’s headlamp design and production year.
- H13 dual-filament (9008/HB2) for combined low and high beams in many modern Cascadia headlamps.
- H4 (9003) used in some older or alternate headlamp configurations that mirror traditional triple-beam setups.
- Separate low/high beams using different bases such as 9005 (high) and 9006 (low) in certain headlamp designs.
- Upgraded or aftermarket options (e.g., LED or HID) may be used with compatible headlamp assemblies, but these are not standard OEM bulbs and require proper fitment.
Because the Cascadia uses different headlamp assemblies across generations, always confirm the exact bulb type for your truck by checking the headlamp housing markings, the owner’s manual, or a Freightliner dealer.
How to verify the correct bulb for your Cascadia
To ensure you buy the right bulb, verify the specification for your specific vehicle and headlamp assembly.
- Check the owner's manual or service manual for the headlamp bulb specification corresponding to your Cascadia's year and trim.
- Remove the installed bulb from the headlamp and read the markings on the base (bulb type and wattage are usually printed there).
- Compare the markings with official replacement catalogs from Freightliner or reputable suppliers to confirm compatibility.
- If in doubt, consult your dealer or a certified service technician to avoid mismatched bases or beam patterns.
Accurate identification helps ensure proper fit, beam pattern, and road visibility.
Summary
Freightliner Cascadia headlight bulb types are not universally fixed across all years and trims. The most common OEM choice is the H13 dual-filament bulb, but some configurations use H4 or separate low/high bulbs. Always verify the exact bulb for your specific truck by consulting the manual, inspecting the bulb base, or checking with a Freightliner dealer to ensure correct replacement and safe operation.