Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 440 bulletins for KENWORTH
51-017
Apr 26, 2024
110000 ELECTRICAL SYSTEM
Certain Kenworth T180/T280/T380/T480 trucks may have mis-pinned wires for the Bluetooth system which may cause the Bluetooth to not function properly when the driver tries to make/receive a call.
24KWF
Apr 10, 2024
010000 STEERING
Certain Kenworth vehicles from model year 2025 may contain steering gear(s) with a sector shaft that may not meet hardness requirements for the gear teeth due to improper heat treating during assembly. Sector shaft gear teeth with lower th
24KWD
Apr 9, 2024
040000 SERVICE BRAKES, AIR
Certain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air volume requirements per FMVSS/CMVSS 121 ??A?A?Air Brake Systems??A?A?. This bulletin will be updated when repair parts and procedur
24KWE
Mar 21, 2024
100000 POWER TRAIN
Safety Recall a?? INTERIM NOTIFICATION Parts are not currently available for this safety recall. This bulletin will be updated once repair parts are available. The right-hand shift stalk may have an improper wire harness terminal crimp wi
Fuse Holder
Mar 5, 2024
110000 ELECTRICAL SYSTEM
The battery box located directly under the driver's side doorsteps of the cab is equipped with a 50A fuse and fuse holder that is connected directly to the battery for constant power. This fuse powers a 70A relay that is used for the safety
16-047
Feb 19, 2024
020000 SUSPENSION
Info Only Certain chassis may have creaking, popping, or knocking noises coming from the front suspension when turning or going over bumps.
24KWA
Feb 16, 2024
130000 VISIBILITY
SAFETY RECALL Certain T180/T280/T380/T480 chassis may have cab mirror glass lock rings not fully seated. This could result in loss of mirror glass, reducing rear visibility and increasing the risk of an accident or injury. Missing mirrors
24KWC
Feb 12, 2024
010000 STEERING
Safety Recall Inspection procedures are available. Steering gear serial numbers must be inspected to determine suspect gears. Certain steering gears may have been assembled incorrectly, causing the gear to fracture. This can cause a loss o
42-062
Dec 18, 2023
060000 ENGINE AND ENGINE COOLING
Certain W900 Mahle radiator assemblies were built with closed upper vent ports. This closed port can result in slow deaeration of coolant leading to trapped air in the cooling system. Trapped air can cause higher than normal engine operatin
23KWK
Nov 28, 2023
150000 SEAT BELTS
Safety Recall Interim Notification On certain Kenworth model year 2018 through 2024 C500/T660/T800/W900 trucks with Sears Atlas 70 or 80 series seats, an additional spacer was installed on the seatbelt mounting assembly. In a severe colli
23KWG
Nov 8, 2023
100000 POWER TRAIN
On certain Kenworth K270/K370 chassis equipped with Dana SPL100 drivelines, the driveline tube seam weld may separate or tear under certain stress loads, resulting in driveline separation and sudden loss of drive power, which in turn may in
02-187
Nov 1, 2023
160000 STRUCTURE
Certain T680 Next Gen medium-length hoods may develop cracks at the hood strut attachment area. A repair kit and procedure are available to reinforce this area to prevent further damage and avoid hood replacement.
23KWJ
Oct 19, 2023
040000 SERVICE BRAKES, AIR
Safety Recall Interim Notification Certain T280/T380/T480 chassis built with 2.1m Medium Duty End of Frame Trailer Connections may not meet the standard trailer brake release timing requirements by 0.5 seconds. A delay in the trailer brak
E306
Oct 18, 2023
080000 FUEL SYSTEM, DIESEL
Incorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the following: .Debris and contaminants introduced into the high-pressure fuel system. .Denial of warranty claims for injector and/or f
E292 KW
Oct 3, 2023
060000 ENGINE AND ENGINE COOLING
Campaign Certain EPA2021 chassis equipped with PACCAR MX engines have Selective Catalytic Reduction (SCR) contamination that occurred during manufacturing. SCR assemblies will be inspected and replaced as necessary.
E304
Oct 3, 2023
060000 ENGINE AND ENGINE COOLING
E304: PACCAR MX-11 and MX-13 EMY2016 NOx and N2O Exceedance Emissions Recall Certain vehicles with PACCAR MX-11 and MX-13 EMY2016 engines with less than 300,000 miles (482,803 km) have been shown, in testing, to exceed regulatory limits
04-022
Sep 1, 2023
160000 STRUCTURE
Replacement fuel bezels are available for T680 Next Gen fairings. New bezels have updated attachments to prevent the bezel from becoming loose.
45-065
Sep 1, 2023
060000 ENGINE AND ENGINE COOLING
Certain 579 MLU chassis equipped with Cummins X15 engines have fan hub bracket hardware that are incorrect for the application and/or under torqued and could become loose and/or fail. Procedures are available to replace and properly torque
42-061
Aug 31, 2023
110000 ELECTRICAL SYSTEM
Certain T680 NextGen chassis have a CAN terminating resistor that may become loose and rub on the cooling module, causing fin damage and possible cooling module leaks. Procedures are available to reroute and secure the resistor and harness.
02-174
Aug 30, 2023
060000 ENGINE AND ENGINE COOLING
Certain W990 hood-mounted engine air intake covers could loosen and rattle or separate from vehicle. New air intake covers are available with improved retention. Installation of new covers requires hood modification. Procedures are availabl
02-184
Aug 30, 2023
160000 STRUCTURE
Certain W990 chassis may have hood hardware that could loosen. Additionally, some chassis may have hood rests that are too rigid causing excessive noise. Hood attaching hardware and hood rests will be replaced as necessary.
23KWE
Aug 22, 2023
100000 POWER TRAIN
Safety Recall: Parts and repair procedures are now available. Kenworth has determined that a safety defect exists in certain Model Year 2023-2024 T280, T380, and T480 chassis with TX-8 transmissions and flange mounted yokes. A locking featu
E283
Jun 9, 2023
060000 ENGINE AND ENGINE COOLING
PACCAR MX Engine Model Year 2021B Engine Fuel Injector Connectors Not Seated Campaign - Certain Model Year 2022 chassis equipped with an Engine Model Year 2021B PACCAR MX-11 or MX-13 engine may experience partially seated fuel injector el
E293
Jun 9, 2023
060000 ENGINE AND ENGINE COOLING
Emissions Recall Certain Vehicle Model Year 2017-2019 chassis equipped with EPA2017 compliant PACCAR MX-13 engines have an EGR flex pipe that can develop cracks and leak untreated exhaust. The EGR Flex pipe will be replaced if it has a susp
43-072
Jun 2, 2023
060000 ENGINE AND ENGINE COOLING
Certain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins ISX12/ISX15/X15 engines that had a previously failed DEF sensor and with DEF sensor software disabled due to industry DEF sensor shortages will