Service bulletins for the 2018 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.
523 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-00-018-WST | 2026-06-01. Service bulletin. UNKNOWN OR OTHER. Technical Service Bulletin for StarNet Manuals Moving to Technical Literature |
| CXA 3_25_NOx | 2025-04-02. Other. ENGINE. CX Advocate for NOx conversion low faults |
| CXA 2_25_Turbo Oil Drain | 2025-03-04. Other. ENGINE. CX Advocate for turbo oil drain cracking |
| CXA 2_25_NOx | 2025-03-04. Other. ENGINE. CX Advocate for NOx conversion low faults |
| CXA 1_16_Turbo Oil Drain | 2025-01-29. Other. ENGINE. CX Advocate for turbo oil drain cracking |
| CXA 1_16_NOx | 2025-01-29. Other. ENGINE. CX Advocate for NOx conversion low faults |
| CXA 1_16_GATS2.4 | 2025-01-29. Other. ENGINE. CX Advocate for GATS2.4 being expanding to DD15 |
| CXA 1_16_DD13 Altitude | 2025-01-29. Other. ENGINE. CX Advocate for DD13 Gen 5 engines operating at high altitude experience EGR slow response fault. |
| CXA 1_16_CARB Truck Chec | 2025-01-29. Other. ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test submissions for the Clean Truck Check. |
| CXA 11_21_CARB Truck Chec | 2024-12-04. Other. ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test submissions for the Clean Truck Check. |
| 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 |
| CXA_10_17_CARB Truck Chec | 2024-11-07. Other. ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test submissions for the Clean Truck Check. |
| 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 |
| ICI24-031 | 2024-09-07. Other. ENGINE. Important Campaign Information letter for DDC D23M3 - Campaign Reactivated and Extended. Field Service Campaign D23M3 - GHG17 DETROITTM DD16® Vibration Damper Replacement has been extended for an additional 6 months. |
| CXA 7_24_NOx | 2024-08-02. Other. ENGINE. CX Advocate for NOx conversion low faults. Update to CXA 6_24_NOx submission. |
| CXA 06_24_NOx | 2024-07-09. Other. ENGINE. CX Advocate communication for NOx conversion low faults |
| VSWP Customer Letter | 2024-06-22. Other. ENGINE. Customer letter regarding variable speed water pump. |
| SS734-WST | 2024-06-05. Other. SUSPENSION. Service Solution for Thread Spring Pin Suspension Alignment & Installation |
| SS763-WST | 2024-06-05. Other. ENGINE. Service Solution for DEF Pump Wiring for Cummins CM2450 Engine Controller |
| TSB35-023-WST | 2024-06-05. Service bulletin. POWER TRAIN. Technical Service Bulletin for New Final Drive Over Heat Diagnostic |
| ICI24-006 | 2024-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Important Campaign Information letter for FL974 - Revised Bulletin & Population |
| FL974 | 2024-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Revised Emissions Recall: Cummins DEF Sensor Shortage. REVISION: Some vehicles formerly in Group F have been moved to Group G and have been assigned a new part number as specified in Table 1. An SRT for 'Calibration Code Only: Update or Confirm' has been added, as shown in Table 2, to be used when a new DEF header is not required. There have been some other minor changes to the work instructions and SRT times. |
| FL974 | 2024-02-06. Service bulletin. ENGINE AND ENGINE COOLING. Emissions Recall: Cummins DEF Sensor Shortage |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.