Freightliner Cascadia 2009–2014 — technical service bulletin
Bulletin 83-144 · NHTSA communication 10140819 · issued Feb 1, 2015
Technical service bulletin
communication type
Electrical System
component
2009–2014
model years
6
vehicle entries
Official summary
83-144 - Optimized Idle and Auxiliary Cab Heater Concurrent Operation
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.