Service bulletins for the 2020 Western Star 6900
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.
112 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Software are shown. Show all
| 17TS-05REV2 | 2020-10-21. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. Revised Technical Service Letter for Detroit DT12 TCM GHG17 Only; Bootloader Update. On Detroit DT12 equipped vehicles, it may be necessary to complete an additional step in the programming process when updating the TCM software. |
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| 20CSA-03 | 2020-03-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Customer Service Announcement saying that Service Pack (SP) 2 for Diagnostic Link 8.11 Standard and Professional will be available for download from the Detroit Diesel server. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.