Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 526 bulletins for WESTERN STAR
21TS-12REV
Oct 1, 2021
060000 ENGINE AND ENGINE COOLING
Revised Detroit Technical Service Letter for Gen 5 Detroit DD16 Poor Acceleration Complaints In Western Star 49X Chassis When Lightly Loaded. This letter has been removed as more current information is now available in the campaign letter D
SS705-WST 2021
Sep 24, 2021
110000 ELECTRICAL SYSTEM
Service Solution for XMC Output Reliability. Reliability issue with the six 20 Amp outputs (DO1-DO6) on the XMCa??s. A software revision is now available to allow 20 Amp outputs work reliably on XMCa??s for 49X.
CALWS83-001
Sep 10, 2021
110000 ELECTRICAL SYSTEM
Customer Advisory Letter for HVAC Actuator Wiring Harness. The wiring harness of the actuator of the fresh air recirculation door, shown in Fig. 1, on Western Star vehicles equipped with Red Dot HVAC systems should be inspected for signs of
SF636
Sep 8, 2021
100000 POWER TRAIN
Field Service Campaign for Western Star 49X Differential Lock - Parameter Update. Vehicles may automatically disengage the differential lock without warning when vehicle speed reaches 25 mph.
SS711-WST 2021
Aug 30, 2021
110000 ELECTRICAL SYSTEM
Service Solution for Aux E-vault Rattle in Day Cab. Rattle noise inside of cab coming from the e-vault location. Mounting bracket has low fore/aft stiffness
21TS-12
Aug 20, 2021
060000 ENGINE AND ENGINE COOLING
Technical Service Letter for GHG21 Detroit DD16 Poor Acceleration Complaints In Western Star 49X Chassis When Lightly Loaded.
SS716WST-2021
Aug 19, 2021
130000 VISIBILITY
Service Solution for Exterior Sun Visor Loose. Leg support of sun visor may debond from visor installation.
SS715WST-2021
Aug 19, 2021
060000 ENGINE AND ENGINE COOLING
Service Solution for Transmission Cooler Line Plumbing Fitting. Transmission cooler line plumbing fitting connections at the radiator may have relative movement between rail and radiator allowing fittings to become loose and leak.
PTP PAINT UPDT
Aug 19, 2021
980000 UNKNOWN OR OTHER
Portland Truck Plant Paint Update - WST182 The Portland Truck Plant schedule is full through the end of 2021 for Western Star 4700, 4800, 4900, and 6900 models; the plant has also reached the maximum paint process capacity for multi-color
SBW54-079
Jul 19, 2021
110000 ELECTRICAL SYSTEM
Western Star Service Bulletin for Replacing 104-Way Terminal Wiring Using a Pigtail Kit. This bulletin contains information required to replace 104-way connector wires or terminals using the properly sized pigtail, as documented in the kit
CALWS31-001
Jun 16, 2021
200000 WHEELS
Customer Advisory Letter for 4-Hook Chain Hanger Replacement.
SS709WST2021
Jun 14, 2021
070000 FUEL SYSTEM, GASOLINE
Service Solution for fuel level sending unit loose.
SS708-WST2021
Jun 11, 2021
110000 ELECTRICAL SYSTEM
Western Star Service Solution for Low Voltage Disconnect (LVD) Troubleshooting: Western Star 5700 and New 4700.
SBW54-080
Jun 10, 2021
110000 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.
SS702-WST2021
May 25, 2021
120000 EXTERIOR LIGHTING
Western Star Service Solution for hood fender marker lamp. Marker lamp design may allow water to collect internally.
SS705-WST2021REV
May 24, 2021
110000 ELECTRICAL SYSTEM
Revised Western Star Service Solution for XMC Output Reliability regarding the six 20 Amp outputs (001-006) on the XMC's.
SS705-WST2021
May 14, 2021
110000 ELECTRICAL SYSTEM
Western Star Service Solution for XMC Output Reliability regarding the six 20 Amp outputs (001-006) on the XMC's.
TechTalk566759
May 13, 2021
100000 POWER TRAIN
Tech Talk Discussion PTO Parameter DT12 Transmission 49X 2021 WU7373
SS703-WST2021
May 7, 2021
160000 STRUCTURE
Western Star Service Solution for Wheel Cut and Fender Interference. 49X vehicles built with certain 425 size front steer tires interfere with inner fender.
TechTalk566681
May 5, 2021
110000 ELECTRICAL SYSTEM
Tech Talk Discussion No comms with CPC, MCM or ACM
TechTalk566647
May 3, 2021
040000 SERVICE BRAKES, AIR
Tech Talk Discussion 121-8861-005 3 Compartment air tank with one way internal check valve
SS701-WST2021
Apr 29, 2021
100000 POWER TRAIN
Service Solution for DT12 Harness Chaffing - PT Can Faults. Transmission will not shift into Gear while driving or will not start and trigger multiple PT CAN Fault Codes.
TechTalk23864
Apr 26, 2021
060000 ENGINE AND ENGINE COOLING
Tech Talk discussion on a belt stretch tool sent to service techs.