Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin P4HALOGENUPDATE · NHTSA communication 10187844 · issued Feb 16, 2021
Technical service bulletin
communication type
Exterior Lighting
component
2017–2022
model years
6
vehicle entries
Official summary
Customer Maintenance Enhancements for the P4 Halogen Lamp replacement procedure.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.