Service bulletins for the 2021 Freightliner Cascadia
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
509 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Ignition are shown. Show all
| SS1034670 | 2020-09-24. Service bulletin. ELECTRICAL SYSTEM:IGNITION; ENGINE; EQUIPMENT. 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 This Service Solution has been superseded to service bulletins SB 54-336 and 54-329.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. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.