# Service bulletins for the 2021 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.

117 bulletins from NHTSA, as of 2026-10-19.

- [PB\-47\-900\-WST](/bulletins/11034507.md), 2026-07-06, Service bulletin: FUEL/PROPULSION SYSTEM. Parts Bulletin for Fluorosilicone Fuel Tank Cap Seals
- [CXA 03\_26\_Surge Tank](/bulletins/11030507.md), 2026-04-02, Other: ENGINE. CX Advocate for discolored coolant surge tanks \(24CSA\-20\)
- [CXA\_10\_25\_Conmet Oil Pan](/bulletins/11024958.md), 2025-11-05, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues
- [24CSA\-19Rev](/bulletins/11022317.md), 2025-09-02, Other: ENGINE. Revised Customer Service Annoucement for No Trouble Found Heavy Duty Engine Product \(HDEP\) Oil Separator Leaks
- [CXA 3\_25\_NOx](/bulletins/11016309.md), 2025-04-02, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 2\_25\_NOx](/bulletins/11014818.md), 2025-03-04, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 1\_16\_NOx](/bulletins/11013204.md), 2025-01-29, Other: ENGINE. CX Advocate for NOx conversion low faults
- [SS1023366\-Detroit](/bulletins/11010143.md), 2024-11-06, Other: ENGINE. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines
- [24CSA\-20](/bulletins/11010131.md), 2024-11-06, Service bulletin: ENGINE. Customer Service Annoucement for Discolored Coolant Surge Tank on Heavy Duty Engine Product \(HDEP\)
- [24CSA\-19](/bulletins/11010130.md), 2024-11-06, Other: ENGINE. Customer Service Annoucement for Heavy\-Duty Engine Product \(HDEP\) Oil Separator Leaks
- [SS1023366\-Detroit](/bulletins/11008508.md), 2024-10-04, Other: ENGINE. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines
- [CXA 8\_24\_Conmet Oil Pan](/bulletins/11007517.md), 2024-09-07, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Failures
- [CXA 8\_24\_AutoElevate Disa](/bulletins/11007513.md), 2024-09-07, Other: ENGINE. CX Advocate for AutoElevate Disablement Gen5 Engines
- [CXA 8\_24\_AutoElevate and](/bulletins/11007512.md), 2024-09-07, Other: ENGINE. CX Advocate for benefits of Autoelevate and hydrocarbon faults
- [CXA 7\_24\_NOx](/bulletins/11005500.md), 2024-08-02, Other: ENGINE. CX Advocate for NOx conversion low faults. Update to CXA 6\_24\_NOx submission.
- [CXA 7\_24\_Conmet Oil Pan](/bulletins/11005494.md), 2024-08-02, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Failures
- [CXA 7\_24\_AutoElevate Disa](/bulletins/11005493.md), 2024-08-02, Other: ENGINE. CX Advocate for AutoElevate Disablement Gen5 Engines
- [CXA 06\_24\_Clutch Bolts](/bulletins/11003924.md), 2024-07-09, Other: POWER TRAIN. CX Advocate communication for clutch bolts
- [CXA 06\_24\_NOx](/bulletins/11003889.md), 2024-07-09, Other: ENGINE. CX Advocate communication for NOx conversion low faults
- [VSWP Customer Letter](/bulletins/11001976.md), 2024-06-22, Other: ENGINE. Customer letter regarding variable speed water pump.
- [SS734\-WST](/bulletins/11000986.md), 2024-06-05, Other: SUSPENSION. Service Solution for Thread Spring Pin Suspension Alignment \& Installation
- [SS763\-WST](/bulletins/11000984.md), 2024-06-05, Other: ENGINE. Service Solution for DEF Pump Wiring for Cummins CM2450 Engine Controller
- [TSB35\-023\-WST](/bulletins/11000978.md), 2024-06-05, Service bulletin: POWER TRAIN. Technical Service Bulletin for New Final Drive Over Heat Diagnostic
- [SS3144\-FTL](/bulletins/10253879.md), 2024-05-07, Service bulletin: ENGINE AND ENGINE COOLING. Service Solution for DEF Pump Wiring for Cummins CM2450 Engine Controller
- [ICI24\-006](/bulletins/10251202.md), 2024-03-06, Service bulletin: ENGINE AND ENGINE COOLING. Important Campaign Information letter for FL974 \- Revised Bulletin \& Population

More: [the next page](/v1/vehicles/2021_western-star_4900/bulletins?cursor=2024-03-06_10251202) (JSON)

JSON: [/v1/vehicles/2021_western-star_4900/bulletins](/v1/vehicles/2021_western-star_4900/bulletins)

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