Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin SB26-054 · NHTSA communication 10205881 · issued Dec 7, 2021
Technical service bulletin
communication type
Power Train
component
2017–2022
model years
6
vehicle entries
Official summary
DT12 Transmission Control Harness Chafing the Transmission Control Module. Classic and New Cascadia vehicles equipped with DT12 transmissions, built from approximately January 2017 to mid-March 2021, may experience rubbing/chafing on the chassis harness near the transmission.
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.