Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin TechTalk4855 · NHTSA communication 10187928 · issued Feb 14, 2021
Technical service bulletin
communication type
Electrical System
component
2017–2022
model years
6
vehicle entries
Official summary
Tech Talk continued discussion for P4 Next Gen Cascadia dome lights stay on while driving.
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.