The standard headlight configuration on most 2017 Freightliner Cascadia models uses a low-beam bulb sized H11 and a high-beam bulb sized 9005. If your truck has optional lighting or aftermarket headlights, sizes may differ.
The Cascadia’s headlights are typically a two-bulb setup with separate low- and high-beam bulbs. This article explains the common sizes and how to confirm the exact bulb size for your specific vehicle.
Typical headlight bulb sizes for the 2017 Cascadia
These are the sizes you’ll most often encounter in stock headlight assemblies on 2017 Cascadia trucks. Variations can occur due to trim level, optional equipment, or aftermarket replacements.
- Low beam: H11
- High beam: 9005
When replacing bulbs, verify wattage compatibility (commonly around 55W for H11 and 65W for 9005) and note that some Cascadia configurations may use different lighting options such as HID or LED. If unsure, consult the owner's manual or a Freightliner dealer.
How to verify your exact bulb size on your Cascadia
To confirm the precise bulb size for your vehicle, follow these steps:
- Check the owner's manual under Lighting or Bulbs for the recommended sizes.
- Inspect the back of the headlight housing for a label or size code when the cover is removed.
- Remove the bulb you plan to replace and read the markings on the base or bulb itself (the size is usually printed on the bulb).
- Consult a Freightliner dealer or parts catalog with your VIN if your truck has HID/LED headlights or aftermarket assemblies.
Following these steps will help ensure you order the exact bulb for your specific truck configuration.
Additional notes on lighting options
Some 2017 Cascadia units were equipped with factory HID or LED headlamps, which do not use standard halogen bulbs. If your Cascadia has these options, replacement components and sizes differ. For fog lights, the bulb size is typically a separate designation (often H16), but it does not affect the primary headlamps.
Summary
For a 2017 Freightliner Cascadia, the conventional headlight setup generally uses H11 for low beams and 9005 for high beams. Always verify the exact sizes for your specific vehicle by checking the owner's manual, the headlight housing label, or contacting a Freightliner dealer—especially if your truck includes optional lighting packages or aftermarket headlamps. Consider using reputable brands and ensure proper installation to maintain safety and compliance.