Freightliner Cascadia 2019–2021 — technical service bulletin
Bulletin SF619 · NHTSA communication 10189616 · issued Mar 30, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2021
model years
3
vehicle entries
Official summary
Field Service Campaign for Cascadia Cummins Natural Gas Engine Exhaust Shield. On certain vehicles, there may be early heat degradation at the front right cab mount due to excessive heat exposure. An exhaust shield will be installed on all vehicles involved.
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.