WenmarOpen by Wenmar Pro

Service bulletins for the 2003 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.

145 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
14TS302017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 14TS30 Aftertreatment Harness Diagnostics
14TS282017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 14TS28 DD Platform Belt Drive System - Belt Part Numbers and diagnostics
1003-142017-11-17. Service bulletin. ELECTRICAL SYSTEM:STARTER ASSEMBLY. 1003-14 Rough Running or Stalling.
1009-142017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 1009-14 SPN 5016 (ACM) (GHG14)
1007-142017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 1007-14 SPN 5016/FMI 3, 4 (ACM) (EPA10)
1006-142017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 1006-14 SPN 4374 (ACM) (GHG14)
1008-142017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 1008-14 SPN 3510FMI 4,7, and 8 (CPC)(GHG14)
1010-142017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 1010-14 SPN 2623 (CPC) (GHG14)
1005-142017-11-17. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE. 1005-14 Oil Coolant Module
18SP684REV42017-11-17. Service bulletin. EQUIPMENT. 18SP684Rev4 18SP684Rev4 ? EPA07 and EPA10 DD Platform EGR Delta Pressure Sensor Update
18SP705REV52017-11-17. Service bulletin. EQUIPMENT. 18SP705Rev5 18SP705Rev5 ? DD Platform Delta Pressure Sensor
14-0402017-11-17. Service bulletin. ENGINE. 14-040 Additional Detroit CLOs for the Heavy Duty Engine Platform
14-0392017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 14-039 New Detroit Standard Diagnostic Times
14-0382017-11-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. 14-038 Additional Detroit Standard Repair Times
WSB-49-112014-02-13. Service bulletin. FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY. WESTERN STAR: WHEN TRUCK SITS, FOR ANY EXTENDED PERIOD, WITH A DIESEL EXHAUST FLUID (DEF) SYSTEM, IT WOULD CRYSTALLIZED, IN THE TANK, AROUND FLOAT, ON DEF LEVEL SENDING UNIT TUBE AND NEEDS TO BE CLEANED. *PE
SB-33-042014-01-23. Service bulletin. SUSPENSION:FRONT:WHEEL BEARING. WESTERN STAR: IT HAS BEEN RECOMMENDED, BY CONMET, THAT THE BEARING SPACER BE REPLACED WITH NEW ONE WHEN HUB IS REMOVED. MODEL 4700, 4900, 6900.. NO YEARS LISTED. *PE
SBW-47142013-07-08. Service bulletin. FUEL SYSTEM, GASOLINE. WESTERN STAR: FUEL TANKS ROTATING IN SADDLES. ANTI-SLIP MATERIAL MAY NEED TO BE INSTALLED, OR AN ADDITIONAL STRIP OF RUBBER. *JS
SB-49-122012-06-14. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL; FUEL SYSTEM, DIESEL. WESTERN STAR: AROUND THE DIESEL EXHAUST FLUID (DEF) AN EXCESSIVE AMOUNT OF CRYSTAL OR POWDER BUILT UP INDICATES A LEAK CAUSED BY EVAPORATION OF DEF EXPOSED TO AIR AND/OR DAMPNESS. *PE
FL-581-AB2011-08-08. Service bulletin. STEERING:LINKAGES:ARM:IDLER AND ATTACHMENT. DAIMLER TRUCK SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. A STEERING COMPONENT MAY CRACK AND POSSIBLY BREAK UNDER SEVERE STEERING CONDITIONS. THIS MAY RESULT IN LESS STEERING CONTROL. *RM
SB-88-112009-10-14. Service bulletin. STRUCTURE:BODY:HOOD. WESTERN STAR TRUCK: SOME TRUCKS (4900FA, 123BBC) WITH HOOD SALES CODE 644-002, MAY DEVELOP CRACKS AT THE INNER FENDER, NEAR THE NUTPLATE FOR THE HOOD GUIDE. THE STEEL PIVOT STRUCTURE CAN ALSO CRACK, OUTBOARD OF THE HOOD PIVOT CLEVIS. NO MODEL YEARS LISTED. *PE

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.