Service bulletins for the 2021 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.
76 on file from NHTSA, as of 2026-10-19.
| WI24-019 | 2024-12-04. ENGINE. Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair Time Updates |
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A warranty extension may pay for a repair after the basic warranty has ended. Read the document for which vehicles and which repair it covers.
By type
By component
| PB-47-900-WST | 2026-07-06. Service bulletin. FUEL/PROPULSION SYSTEM. Parts Bulletin for Fluorosilicone Fuel Tank Cap Seals |
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| TSB-32-020-WST | 2026-03-27. Service bulletin. SUSPENSION. Technical Service Bulletin for TufTrac M12 Bolts |
| CXA_10_25_Conmet Oil Pan | 2025-11-05. Other. ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues |
| PB33-005-WST | 2025-07-08. Service bulletin. STEERING. Parts Bulletin for Tie Rod Assembly Part Breakdown |
| WI24-019 | 2024-12-04. Warranty extension. ENGINE. Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair Time Updates |
| SS1023366-Detroit | 2024-11-06. Other. ENGINE. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines |
| SS1023366-Detroit | 2024-10-04. Other. ENGINE. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines |
| CXA 8_24_Conmet Oil Pan | 2024-09-07. Other. ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Failures |
| CXA 8_24_AutoElevate Disa | 2024-09-07. Other. ENGINE. CX Advocate for AutoElevate Disablement Gen5 Engines |
| CXA 8_24_AutoElevate and | 2024-09-07. Other. ENGINE. CX Advocate for benefits of Autoelevate and hydrocarbon faults |
| CXA 7_24_Conmet Oil Pan | 2024-08-02. Other. ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Failures |
| CXA 7_24_AutoElevate Disa | 2024-08-02. Other. ENGINE. CX Advocate for AutoElevate Disablement Gen5 Engines |
| CXA 06_24_Clutch Bolts | 2024-07-09. Other. POWER TRAIN. CX Advocate communication for clutch bolts |
| SS3144-FTL | 2024-05-07. Service bulletin. ENGINE AND ENGINE COOLING. Service Solution for DEF Pump Wiring for Cummins CM2450 Engine Controller |
| SBW83-030 | 2022-07-02. Service bulletin. VISIBILITY. Updated Western Star Service Bulletin for HVAC Actuator Replacement |
| SBW49-020 | 2022-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Western Star Service Bulletin for DEF Connector Reinforcement Caps |
| ICI21-030 | 2021-11-03. Service bulletin. VISIBILITY. SF626 Western Star Window Replacement Inspection Notification. This letter is to inform you that Field Service Campaign SF626 Western Star Window Replacement Inspection Notification campaign was released. |
| SBW54-080 | 2021-06-29. Service bulletin. ELECTRICAL SYSTEM. Western Star Service Bulletin for Key Fob ID Retention. Key fobs for remote keyless entry on Western Star vehicles are delivered in packages that include a unique ID for the fob. The ID is required when pairing the key fob with a vehicle. |
| SS1033094 | 2021-06-09. Service bulletin. FUEL SYSTEM, GASOLINE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:MANIFOLD PRESSURE (MAP) SENSOR. Service Solution SS 1033094 KUS Float Tube Fuel Level Sensor Inform... |
| WSTCAE180-2020 | 2021-05-18. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Portland Truck Plant Paint Changes |
| WI21-009 | 2021-04-24. Service bulletin. ENGINE AND ENGINE COOLING. Warranty Information letter announcing that DTNA is increasing the Standard Diagnostic Times (SDTs) shown. The updated after treatment system (ATS) diesel exhaust fluid (DEF) pump times will be applied to repair orders opened on or after April 12, 2021. |
| WI21-008 | 2021-04-23. Service bulletin. EQUIPMENT. Warranty Information Letter announcing DTNA is adjusting the Standard Repair Times (SRTs) shown. The updated times will be applied to repair orders opened on or after April 5, 2021. |
| WP60-100 | 2021-03-25. Service bulletin. EQUIPMENT. Updated Western Star Parts Technical Bulletin for Universal Design Floor Mats. This bulletin replaces the version dated February 12, 2021. Information about parts notes in the Paragon system have been added and the trimming instructions are revised. Universal floor mat designs fit multiple cab configurations and may require trimming. Trim lines displaying size options are scored into the pad side of the mat; use an existing floor mat as a guide for optimal results. The new mat should not interfere with safety-critical equipment, such as foot pedals. |
| SBW54-057 | 2021-03-25. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Western Star Service Bulletin for Powernet Troubleshooting Guide - Batteries, Path, Alternator, and Starter. When troubleshooting powernet issues, use the BCT-460DTNA PowerNet Assessment Tool. As of May 29, 2018, the AutoMeter is the only Daimler-approved tool for troubleshooting vehicle Powernet issues. |
| WP21-007 | 2021-03-24. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Warranty Policy Letter for battery tags. DTNA determined that since adopting the AutoMeter BCT-460DTNA Powernet Assessment Tool (AutoMeter) as the required powernet system tester, not all battery tags have to be retained support Warranty-related claims. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.