Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 526 bulletins for WESTERN STAR
SBW83-030
May 10, 2022
130000 VISIBILITY
Updated Western Star Service Bulletin for HVAC Actuator Replacement
SF653
May 8, 2022
270000 LANE DEPARTURE
Western Star Field Service Campaign for Western Star 49X SRR Overwrite Sensor Mounting Data Update. On certain vehicles, the Short Range Radar (SRR) sensor, located on the passenger side, contains incorrect mounting position parameters. Inc
SF652
May 8, 2022
270000 LANE DEPARTURE
Western Star Field Service Campaign for Western Star 49X VRDU Programming. On certain vehicles equipped with Side Guard Assist (SGA), the Video Radar Device Unit (VRDU) contains parameters that have proven to be too sensitive for vocational
SS725-WST2022
Apr 25, 2022
010000 STEERING
Service Solution for Power Steering Cap Contact withHood Strap. Under certain conditions the drivers side hood restraint strap, which is attached to the radiatorand hood, may become lodged behind the power steering cap. When opening the hoo
ICI22-018
Apr 13, 2022
060000 ENGINE AND ENGINE COOLING
Important Campaign Information Letter for DDC D21M7 Termination Date Extended. This letter is to inform you that a revised bulletin for Detroit Diesel Field Service Campaign D21M7, GHG21 Detroit DD16 CPC Software Reprogramming has been EXTE
SF648
Mar 18, 2022
020000 SUSPENSION
Field Service Campaign for Western Star 47X and 49X SBA Front Suspension Shackle Bolts. On certain vehicles, the front suspension shackle bar may have a deformed spring pin hole due to lack of clamp load at the spring pin joint, causing a d
MYCOM_03142022-2
Mar 14, 2022
980000 UNKNOWN OR OTHER
Western Star Multi-Color Paint Designs - WST185 Cab/Hood paint will be limited to Paint: One Solid Color (065-000) for Western Star 4700, 4800, 4900, and 6900 models built at Portland Truck Plant.
SF634
Mar 11, 2022
160000 STRUCTURE
Field Service Campaign for Western Star 49X Front Crossmember. A loss of clamp load, in the aft connection of the engine crossmember and frame rail, could result in a frame rail crack.
ICI22-014
Feb 23, 2022
350000 EQUIPMENT
Important Campaign Information Letter for SF635 ??A?A? Work Instructions Revised.
SF635REV
Feb 23, 2022
350000 EQUIPMENT
Revised Western Star Field Service Campaign for Western Star 49X - XMC Software Update
CALWS54-004
Feb 22, 2022
180000 VEHICLE SPEED CONTROL
Customer Advisory Letter for Western Star 49X Adaptive Cruise Control
SBW54-082
Feb 15, 2022
110000 ELECTRICAL SYSTEM
Western Star Service Bulletin for Battery Load Disconnect Switch Installation. Cab load disconnect switches (CLDS), also known as positive load disconnect, installed on selected vehicles can reduce battery drain when the vehicle is not oper
SBW49-020
Feb 15, 2022
060000 ENGINE AND ENGINE COOLING
Western Star Service Bulletin for DEF Connector Reinforcement Caps
SS715-WST2022
Jan 31, 2022
100000 POWER TRAIN
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.
SS722-WST2022
Jan 20, 2022
030000 SERVICE BRAKES, HYDRAULIC
ABA off Switch Instructions. Incorrect programing parameters in the ICUC were not allowing the ABA to be turned off.
CALWS83-001REV
Dec 9, 2021
130000 VISIBILITY
HVAC Actuator Wiring Harness. Revision History: Service kit part number changed from RDH RD5 17147 0 to WWS RD-3-9069-0 on 12/9/21. The wiring harness of the actuator of the fresh air recirculation door, shown in Fig. 1, on Western Star veh
SS720-WST2021
Nov 23, 2021
110000 ELECTRICAL SYSTEM
Service Solution for Mirror Mounted Antenna Ground. CB radio and or AM/FM radio difficult to hear incoming audible, cuts out.
D21M7
Nov 11, 2021
060000 ENGINE AND ENGINE COOLING
Detroit Field Service Campaign for GHG21 Detroit DD16A? CPC Software Reprogramming. All the vehicles in the population require programming the CPC. Some vehicles require programming the ACM, MCM, and TCM (if equipped with a Detroit DT12 tra
SF641
Nov 1, 2021
100000 POWER TRAIN
Field Service Campaign for Western Star 49X Transmission Cooler Plumbing. Due to normal vibrations combined with inadequate support, the quick-connect fittings on the transmission oil cooler lines may experience excessive wear, leading to a
SS719-WST2021
Oct 20, 2021
120000 EXTERIOR LIGHTING
Beacon Light Wiring Harness. Customer installed beacon lights intermittent operation, flicker, do not flash. XMC allows for up to 2amp lights to be used for beacon light installations, some beacon lights in the aftermarket installations are
SS704-WST2021
Oct 20, 2021
110000 ELECTRICAL SYSTEM
ECP (Electronic Controlled Pneumatics) Ground Noise/False Codes. Internal board of ECP supplied by manufacturer. Audible chirping noise through speakers, leaking air through ECP, continual error codes with no problem found.
ICI21-030
Oct 18, 2021
130000 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.
SF635
Oct 14, 2021
110000 ELECTRICAL SYSTEM
XMC Software Update. Due to a software issue with the Xtra Modular Controller (XMC), some body builder-installed electrical components may not work as intended (may be intermittent or non-functioning).