Service bulletins for the 2023 Western Star 4900
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.
35 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Transmission and driveline are shown. Show all
| CXA 06_24_Clutch Bolts | 2024-07-09. Other. POWER TRAIN. CX Advocate communication for clutch bolts |
|---|---|
| ICI23-043 | 2023-12-06. Service bulletin. POWER TRAIN. Important Campaign Information Letter for SF680 Allison TCM Software Update / TT9108EN |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.