Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 440 bulletins for KENWORTH
E286
Mar 22, 2022
060000 ENGINE AND ENGINE COOLING
Engine Model Year 2021B and later PACCAR MX-11 and MX-13 Fuel Injector Adjustment During First C Service
98-020
Mar 18, 2022
350000 EQUIPMENT
nformation Only a?? New Level 1 required tools are available to support MY21B MX engines.
13-059
Feb 17, 2022
050000 PARKING BRAKE
On certain Model Year 2022A chassis with manual transmissions, the optional a??audible alarm when door is open and park brake is not seta?? feature operates incorrectly due to a software issue. Software will be corrected when available.
51-013
Feb 4, 2022
110000 ELECTRICAL SYSTEM
Due to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet Mobile Gateway (PMG001) will experience severe 3G service degradation as early as January of 2022. Chassis currently utilizing 3G a
R2103
Jan 10, 2022
060000 ENGINE AND ENGINE COOLING
Retrofit - The emissions exemption will be expiring on 5/15/2022 for certain pre-production vehicles equipped with PACCAR MX-11 and MX-13 EPA 2021 Emissions engines. Production-level components are now available to make these vehicles compl
S006
Jan 10, 2022
130000 VISIBILITY
Non-Safety Campaign a?? Sun Visors are available. Parts will be shipped to dealers.
E282
Dec 17, 2021
060000 ENGINE AND ENGINE COOLING
Information Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines, technicians must be able to identify which of these engines are in a chassis.
26-038
Dec 2, 2021
100000 POWER TRAIN
Non-Safety Campaign:A Eaton Endurant transmissions may experience premature Main Drive Gear damage due to clutch housing and main case countershaft bearing bore wear. A Clutch Housing Front Cover Kit will be installed to address the issue.
T012
Dec 2, 2021
100000 POWER TRAIN
Non-Safety Campaign: a??Drivers of vehicles equipped with PACCAR TX-12 transmissions may experience harsh shifts and gear grinding noise. Premature Main Drive Gear damage may occur due to clutch housing and main case countershaft bearing bo
E280
Dec 2, 2021
060000 ENGINE AND ENGINE COOLING
Non-Safety Campaign: Certain DC tools were incorrectly calibrated. The resulting torque issue could affect the EPA21 MX-11 and MX-13 Oil Pan and/or the Exhaust Manifold.
S007
Nov 16, 2021
130000 VISIBILITY
Non-Safety Campaign - Convex mirrors are available. Parts will be shipped to dealers.
03-074
Nov 9, 2021
251000 ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC)
Non-Safety Campaign - The TPMS ECU is not communicating properly with TPMS sensors. The result is a delay or failure of communication between the TPMS ECU and the TPMS sensors , causing inaccurate TPMS readings. A firmware update resolves t
42-059
Nov 9, 2021
060000 ENGINE AND ENGINE COOLING
Non-Safety Campaign - Vehicles with a Cummins X15 engine and Horton fan drive may set Diagnostic Trouble Code (DTC) 6637 and/or 3838 due to fan speed that results in the fan remaining activated until the power is cycled. A new controller wi
43-071
Sep 21, 2021
080000 FUEL SYSTEM, DIESEL
Fix-As-Fail a?? Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available. As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a veh
02-168
Sep 20, 2021
160000 STRUCTURE
Information Only - Rear axle Quarter Fenders with less than two inches of clearance between the top of the quarter fender and the bottom of the trailer/equipment are susceptible to damage. The lack of clearance could result in cracked/broke
21-KWE
Aug 17, 2021
110000 ELECTRICAL SYSTEM
Safety Recall a?? Interim Notification - Certain Mahle HVAC control heads may have a soldering defect which may result in inoperative HVAC controls. Inoperative HVAC defrost may reduce driver visibility, increasing the risk of an accident.
43-069
Aug 17, 2021
080000 FUEL SYSTEM, DIESEL
A DPF regeneration two-position switch parameter is causing inhibited DPF regeneration. A parameter update, via Cummins Insite, restores proper DPF regeneration function.
21 KWF
Aug 6, 2021
082200 FUEL SYSTEM, DIESEL:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
a??Safety Recall - Model year 2021 Cummins PX9 fuel hose assemblies may leak from the hoses between the fuel pump and the remote filter head. A fuel leak in the presence of an ignition source may increase the risk of a fire. A repair is now
E269
Jul 20, 2021
060000 ENGINE AND ENGINE COOLING
Emissions Recall - PACCAR MX-13 Engine Model Year 2015B engines require a software update to ensure emissions compliance for On-Board Diagnostic (OBD).
02-163
Jul 15, 2021
160000 STRUCTURE
"Non-Safety Campaign - A vinyl camouflage wrap was applied to T680 NextGen built during the pre-production phase of the product launch. The wrap can now be removed."
21KWC
Jun 22, 2021
070000 FUEL SYSTEM, GASOLINE
Safety Recall a?? Cummins Fuel Rail Leak a?? NHTSA ID: 21V391 / TC: 2021-323, Cummins Recall: C2423.A Cummins PX9 and ISX12 fuel rails may leak around a sealing washer, potentially resulting in fuel leaks.A Undetected prolonged diesel fuel
21KWD
Jun 14, 2021
060000 ENGINE AND ENGINE COOLING
Information Only a?? C hassis equipped with MY2021 B EPA emission s standards will be shipped through atleast the end of the 2021 calendar year without particulate matter (PM) sensors installed .
E271
Jun 8, 2021
060000 ENGINE AND ENGINE COOLING
An engine software update is required to resolve OBD system readiness, DEF doser diagnostics, and otherOBD system software related issues.
02-164
May 27, 2021
160000 STRUCTURE
A vinyl camouflage wrap was applied to new model 536, 537, and 548 cabs built during the validation phase of the new product launch. The purpose of the wrap was to protect the confidentiality of the trucks until the unveiling.
E265
May 25, 2021
060000 ENGINE AND ENGINE COOLING
Selected engines have been identified to receive a camshaft inspection and an update for improved camshaft lubrication.