Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin SB54-338 · NHTSA communication 10240131 · issued Jul 13, 2023
Technical service bulletin
communication type
Visibility
component
2017–2022
model years
6
vehicle entries
Official summary
Revised Service Bulletin for Updating HVAC ECU Software to Fix Front HVAC Evaporator Freezing and Improve Espar Heater Cool Down. Description of Revisions: This bulletin replaces the version dated December 2021. The general information and warranty information has been updated.
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.