Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin SB54-338 · NHTSA communication 10189331 · issued Mar 3, 2021
Technical service bulletin
communication type
Visibility
component
2017–2022
model years
6
vehicle entries
Official summary
Revised Freightliner Service Bulletin for Updating HVAC ECU Software to Fix Front HVAC Evaporator Freezing and Improve Espar Heater Cool Down. This bulletin replaces the version dated 12/23/2020. Information has been added about ParkSmart units and the instructions have been streamlined.
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.