Freightliner Cascadia 2018–2021 — technical service bulletin
Bulletin D21M3 · NHTSA communication 10189348 · issued Mar 16, 2021
Technical service bulletin
communication type
Power Train
component
2018–2021
model years
13
vehicle entries
Official summary
Detroit Field Service Campaign for DT12 Gear Grind During Downshift Software Update.
Vehicles covered
- 2018 Freightliner Cascadia
- 2019 Freightliner Cascadia
- 2020 Freightliner Cascadia
- 2021 Freightliner Cascadia
- 2018 Western Star 4700
- 2019 Western Star 4700
- 2020 Western Star 4700
- 2021 Western Star 4700
- 2021 Western Star 49X
- 2018 Western Star 5700
- 2019 Western Star 5700
- 2020 Western Star 5700
- 2021 Western Star 5700
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.