Freightliner Cascadia 2020 — technical service bulletin
Bulletin TechTalk6741 · NHTSA communication 10187942 · issued Feb 11, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020
model years
1
vehicle entries
Official summary
Tech Talk discussion on P4 cascadia codes 3597 4 & 5741 13 only active with key off
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.