Freightliner Cascadia 2012–2022 — technical service bulletin
Bulletin D21M1 · NHTSA communication 10191143 · issued Apr 19, 2021
Technical service bulletin
communication type
Power Train
component
2012–2022
model years
31
vehicle entries
Official summary
Detroit Field Service Campaign for DT12 Transmission Drive Shaft Cover Plug Reseal. Daimler Trucks North America LLC, on behalf of its DETROIT Powertrain Division, is initiating Field Service Campaign D21M1 on certain DT12 transmissions in order to reseal the bypass plugs of the drive shaft cover located in front housing.
Vehicles covered
- 2012 Freightliner Cascadia
- 2013 Freightliner Cascadia
- 2014 Freightliner Cascadia
- 2015 Freightliner Cascadia
- 2016 Freightliner Cascadia
- 2017 Freightliner Cascadia
- 2018 Freightliner Cascadia
- 2019 Freightliner Cascadia
- 2020 Freightliner Cascadia
- 2021 Freightliner Cascadia
- 2022 Freightliner Cascadia
- 2012 Western Star 4900
- 2013 Western Star 4900
- 2014 Western Star 4900
- 2015 Western Star 4900
- 2016 Western Star 4900
- 2017 Western Star 4900
- 2018 Western Star 4900
- 2019 Western Star 4900
- 2020 Western Star 4900
- 2021 Western Star 4900
- 2022 Western Star 4900
- 2021 Western Star 49X
- 2015 Western Star 5700
- 2016 Western Star 5700
- 2017 Western Star 5700
- 2018 Western Star 5700
- 2019 Western Star 5700
- 2020 Western Star 5700
- 2021 Western Star 5700
- 2022 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.