Freightliner Cascadia 2020–2021 — technical service bulletin
Bulletin 20TS-11 · NHTSA communication 10200638 · issued Aug 23, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020–2021
model years
2
vehicle entries
Official summary
Technical Service Letter for Detroit CPC501T GHG21 Only; Updating Bootloader Using DL version 8.14 and higher. On Detroit powertrain equipped Cascadiaâ s, built in 2020, it may be necessary to complete an additional step in the programming process when updating the CPC501T software.
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.