Freightliner Cascadia 2017–2020 — technical service bulletin
Bulletin SB54-334 · NHTSA communication 10198593 · issued Jun 1, 2021
Technical service bulletin
communication type
Forward Collision Avoidance
component
2017–2020
model years
4
vehicle entries
Official summary
Freightliner Service Bulletin for Detroit Assurance 4.0 Software v20.05. New Cascadia trucks built from January 1, 2017 through September 9, 2019 and equipped with Detroit Assurance correctly initiate an active brake assist (ABA) event when a vehicle or obstacle is detected in front of the truck. Some of those trucks may continue decelerating to a complete stop, even after the vehicle or obstacle detected in front of the Detroit Assurance-equipped truck has moved away.
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.