Freightliner Cascadia 2020–2021 — technical service bulletin
Bulletin SS1034670 · NHTSA communication 10180099 · issued Sep 16, 2020
Technical service bulletin
communication type
Engine
component
2020–2021
model years
2
vehicle entries
Official summary
Service Solution for Fault Code VRDU 524127/9 - Lost Communication with the MPC. This Service Solution has been superseded to service bulletins SB 54-336 and 54-329. Please see the service bulletins for the most current information. VRDU fault code 524127/9 is often caused by lack of ignition supply to the MPC, which causes it to stop communicating. This usually occurs when voltage is low.
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.