Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 440 bulletins for KENWORTH
E279
Jun 1, 2023
060000 ENGINE AND ENGINE COOLING
An engine software defect exists in certain vehicles equipped with EMY17 MX-13 and MX-11 engines that pertains to timer action and count calibrations for a time-based diagnostic. This diagnostic action checks fuel pressure and has no negati
23KWB
May 3, 2023
040000 SERVICE BRAKES, AIR
Parts and repair procedures are now available. Kenworth has determined that a safety defect exists in certain Model Year 2021-2024 T280, T380, and T480 chassis with air brakes. The brake pedal plunger which connects the brake pedal to the b
36-008
May 1, 2023
110000 ELECTRICAL SYSTEM
Certain 579 chassis are eligible to receive production level Digital Display software, Digital Display, Lane Keep Assist MUX switches, and Kick Panel.
E300
Mar 31, 2023
060000 ENGINE AND ENGINE COOLING
PACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX engines. This is a one-time reimbursement. Only customers who have received E290 injector cleaning qualify for this reimbursement. See
R2301
Mar 24, 2023
060000 ENGINE AND ENGINE COOLING
The emissions exemption expired on 12/31/2021 for certain pre-production vehicles equipped with PACCAR Model Year 2022 MX engines. Production-level engine, VECU, and Digital Display software is now available to make these vehicles compliant
02-176
Feb 28, 2023
160000 STRUCTURE
Model 579 A-pillar fairing adhesive is not properly securing the fairing to the cab structure.
03-087 (E295)
Feb 24, 2023
060000 ENGINE AND ENGINE COOLING
Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual gauge may display incorrect restriction levels. The virtual gauge will be temporarily disabled until a revised sensor strategy is devel
E298
Feb 24, 2023
060000 ENGINE AND ENGINE COOLING
Added extension to 8/31/2024 Certain Engine Model Year 2018 PACCAR MX-11 engines must have the crankcase pressure sensor replaced due to contamination during assembly.
46-003
Feb 17, 2023
110000 ELECTRICAL SYSTEM
A software fix for model 520EV that are not equipped with ESP (Stability Control) is now available. The currently available soft ware, part number:SCM_1p5_BC_R5p00_003, will address issues caused by software version R5.00_002 that affect Pe
E303
Jan 12, 2023
060000 ENGINE AND ENGINE COOLING
This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken bypass valve tabs. Broken oil valve tabs can cause oil flow obstruction to critical engine parts, resulting in serious engine damage.
R2202
Jan 12, 2023
060000 ENGINE AND ENGINE COOLING
The emissions exemption expired on 12/31/2022 for certain pre-production vehicles equipped with PACCAR Model Year 2023 MX engines. Production-level engine, VECU, and Digital Display software is now available to make these vehicles compliant
03-085
Oct 19, 2022
130000 VISIBILITY
Info Only - Parts kits are now available to install the Bendix Side Collision Mitigation Radar system (BlindSpotter) on chassis that were delivered with a Prewire sales code due to parts shortages. Ordering and installation procedures are i
45-064
Oct 18, 2022
060000 ENGINE AND ENGINE COOLING
Info Only - PACCAR is introducing Over-the-Air (OTA) software updates for engine MY17 and newer chassis equipped with Cummins X15, X12, ISX12, ISX12N, L9N, PX-7, and PX-9 engines The technology will leverage the existing Remote Diagnostic c
41-023
Oct 18, 2022
060000 ENGINE AND ENGINE COOLING
Certain T680 NextGen air filter elements that may have been damaged due to excessive vibration were replaced without inspecting the air intake system for dust intrusion. Those vehicles must be inspected to assess possible progressive damage
E296
Aug 3, 2022
060000 ENGINE AND ENGINE COOLING
Kenworth is providing guidance for PACCAR MX Engine Composite Oil Pan leak troubleshooting to avoid over-repairs and to provide warrantable repair guidance. Oil leaks, if not repaired, can lead to severe engine damage.
T013
Jul 27, 2022
100000 POWER TRAIN
chassis with a PACCAR TX-8 transmission without cruise control may have active transmission faults 86-2 and 595-2. These faults do not affect the operation of the transmission and can be ignored.
E297
Jul 27, 2022
060000 ENGINE AND ENGINE COOLING
When updating the software on a truck to RC6 or higher, please ensure a PM sensor is physically installed before performing the software update.
S017
Jun 8, 2022
040000 SERVICE BRAKES, AIR
Due to a global chip shortage, certain chassis will be shipped without the Bendix side object detection radar modules and A-pillar displays. Refer to Sales Bulletin TE2680 for details.
FS010
May 19, 2022
060000 ENGINE AND ENGINE COOLING
Certain T680 NextGen chassis equipped with an RCX230 Horton fan clutch and a Cummins X15 engine are experiencing an adapter harness failure. This failure causes the fan to remain activated while the truck is in operation and may trigger a c
S016
May 19, 2022
160000 STRUCTURE
a??Chassis were shipped without door stop plates installed due to a supplier shortage. Parts kits are now available and shipped to dealers. Installation procedures and warranty information have been included. Cotter pins are not included in
42-060
May 11, 2022
060000 ENGINE AND ENGINE COOLING
a??Fix-As-FailA a?? If a customer comes into your dealership and demonstrates the condition above, replace the fan clutch adapter harness with the improved harness and clear the DTCs.
22KWB
May 10, 2022
010000 STEERING
Safety Recall ??A?A? Interim Notification - The Dana D-Series front axle steer arm fasteners that attach the steer arm to the steering knuckle may fail, increasing the risk of a crash or injury. Repair information will be added when a repai
32-021
Apr 18, 2022
060000 ENGINE AND ENGINE COOLING
Model Year 2022 chassis with Cummins X15 engines may have inoperative auto-start systems due to a Cummins software update. Refer to Cummins bulletin TSB210135.
E285
Apr 4, 2022
060000 ENGINE AND ENGINE COOLING
Emissions Recall: Engine Model Year 2021 MX engines built to EPA 21 emission standards (MY21B) and manufactured without a Particulate Matter (PM) sensor are required to have a PM sensor installed and the engine software updated. This is req
E290
Mar 31, 2022
060000 ENGINE AND ENGINE COOLING
An EPA21 MX fuel injector cleaning procedure is available. The attached document details the fuel injector cleaning procedure and helps to determine when it is necessary to replace the injectors.