Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
01-093
Service Bulletin/Repair Instructions
KW: On certain T680 BEV chassis, installing an updated A/C suction line between the A/C compressor and thermostatic expansion valve (TXV) will help maintain optimal performance and protect the evaporator core tubing and TXV seals. PB: On certain Model 579 BEV chassis, installing an updated A/C suction line between the A/C compressor and thermostatic expansion valve (TXV) will help maintain optimal performance and protect the evaporator core tubing and TXV seals.
24KWL/PBL
Service Bulletin/Repair Instructions
The verbiage in the Introduction section has been updated.
43-088
Service Bulletin/Repair Instructions
The procedure has been updated to include additional steps for verifying the software level on the vehicle electronic control unit (VECU2) and digital display (DD). Steps have also been added to the PACCAR Common Rail Injection 2 (PCI2) software verification.
41-029
Service Bulletin/Repair Instructions
Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
E335
Service Bulletin/Repair Instructions
7/17/2026: Removed filter on KW Chassis List.
E316
Service Bulletin/Repair Instructions
The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
E318
Service Bulletin/Repair Instructions
The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage. The Warranty section has also been updated to include Peterbilt specific SRT codes for filing cross-division repairs.
46-020
Service Campaign
KW: A new electric power take-off (ePTO) motor mount shim and an improved spline shaft are available for certain T680 BEV chassis with ePTO motors. PB: A new electric power take-off (ePTO) motor mount shim and an improved spline shaft are available for certain Model 520 BEV and 579 BEV chassis with ePTO motors.
CE019
Service Bulletin/Repair Instructions
Multiple fuel injector part numbers have been added to this warranty policy.
CE033
Warranty Program/Extension
KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy.
43-080
Service Bulletin/Repair Instructions
KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The repair procedure has been updated with additional note boxes for clear instructions. PB: The repair procedure has been updated with additional note boxes for clear instructions.
R2601
Service Bulletin/Repair Instructions
Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.
02-177
Service Bulletin/Repair Instructions
Troubleshooting procedures for 2.1m cab power windows are now available.
43-087
Service Bulletin/Repair Instructions
(KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
41-024
Service Bulletin/Repair Instructions
Procedures have been updated to include additional truck models in the service intervals table.
42-064
Service Bulletin/Repair Instructions
Fix-as-Fail On certain Kenworth T680 chassis equipped with PACCAR MX-13 engines, wiring to the Horton LCX230 crank-mounted fan drive may experience a short due to chafing or water ingress, affecting fan drive operation.
E338
Service Campaign
Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s manufacturing specifications.
45-070
Service Bulletin/Repair Instructions
The attached procedures document has been updated with more detail and explanations. This is not a stand-alone procedure. Cummins Quickserve troubleshooting will specify the use of these procedures while troubleshooting specific fault codes.
14-034
Service Bulletin/Repair Instructions
Bogie Crossmember Torque Value Update - Procedure has been updated to correct torque values.
E326
Emissions
EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.
01-090
Service Bulletin/Repair Instructions
Bulletin Update 03/02/2026 - A Meritor OnTrac case submission is required prior to repairs being completed. Failure to do so may result in warranty claim denial. See the procedure section for more details.
22KWE/PBE
Service Bulletin/Repair Instructions
Sheppard Recall Order Process Update - The Parts section has been updated with revised steps for opening a TCS365 Order Support – Order Inquiry case.
CE031
Warranty Program/Extension
Fuel Injection Pump part number 2344776PEX for MX-13 engines has been added to this warranty policy.
24PBE_KWE
Service Bulletin/Repair Instructions
The Parts section has been updated to clarify that freight charges for safety recall orders should not be passed on to the end customer.
24KWE / 24PBE
Service Bulletin/Repair Instructions
The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “!” next to DNR/DNRP indicator, “-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
FS015
Service Campaign
TX-12 MTM Loose Cap Screw Update The chassis list was updated to indicate T680 or T680 Next Gen. SRT codes B25-28A and B25-28B apply to T680 Next Gen chassis.
FS016
Service Campaign
Eaton Endurant MTM Loose Cap Screw Update The chassis list was updated to indicate T680 or T680 Next Gen. SRT codes B25-29A and B25-29B apply to all T680 chassis..
24PBE_24KWE
Warranty Program/Extension
24PBE_24KWE RH Shift Stalk Update Warranty section has been updated with revised verbiage for picture requirements.
43-076
Service Bulletin/Repair Instructions
Certain vehicle model years 2020-2025 K270, K370, T270, T280, T370, T380, T480, T680, T880, W900 chassis have updated Greenhouse Gas (GHG) labels available for installation.
24KWE/24PBE
Emissions
The parts section has been updated for clarity. The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “!” next to DNR/DNRP indicator, “-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
25PACF
Service Bulletin/Repair Instructions
Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013 / Q21-1157-002-002 / Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009. See attached Parts Matrix for required parts per chassis.
24PBE/KWE
Warranty Program/Extension
The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “!” next to DNR/DNRP indicator, “-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
24KWE
Service Campaign
The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “!” next to DNR/DNRP indicator, “-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
24KWD
Service Bulletin/Repair Instructions
SAFETY RECALL Additional chassis have been included. The chassis list has been updated. Certain T370 / T440 / T470 / T480 / T660 / T680 / T800 / T880 / W900 / C500 chassis may be equipped with air tank reservoirs that have less than twelve times the combined volume of all service brake chambers which fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) No.121, Air Brake Systems.
25WC/PBC - KW
Service Bulletin/Repair Instructions
Safety Recall Certain Kenworth T680E Battery Electric Vehicle (BEV) chassis equipped with certain Accelera High VoltageInterlock Loop (HVIL) circuit configurations may experience a sudden loss of high voltage power with unintended opening of electrical contractors, which may occur without warning. This can result in a loss ofpropulsion and may increase the risk of a crash. Software version verification, along with the installation of an upgraded circuit overlay harness kit, is required to address this issue.
25KWC
Service Bulletin/Repair Instructions
Safety Recall – Interim Notification Certain Kenworth T680E Battery Electric Vehicle (BEV) chassis equipped with certain Accelera High VoltageInterlock Loop (HVIL) circuit configurations may experience a sudden loss of high voltage power with unintended opening of electrical contractors, which may occur without warning. This can result in a loss of propulsion and may increase the risk of a crash. This bulletin will be updated when parts and procedures are available.
46-013
Service Campaign
Certain Kenworth Battery Electric Vehicle model T680E chassis have been built prior to the availability of certain labels and Low Voltage Distribution System (LVDS) Components. An upfit is now available for these chassis. An inspection is to be completed with installation of required components.
04-024
Service Bulletin/Repair Instructions
Campaign Certain T680 Next Gen fairings may have a loose or missing bushing that allows the rear partial fairing to rattle during operation. Parts and procedures are available to replace the pin on the fairing (both sides) with a bolt/spacer combination to reduce fairing rattle.
46-010
Service Bulletin/Repair Instructions
A software update is available for T680E Battery Electric Vehicles. This software update corrects certain issues with odometer and cold weather operation.
14-033
Service Bulletin/Repair Instructions
14-033: T680/T880/W990 Crossmember Fastener Torque Certain chassis may have under-torqued crossmember fasteners. Frame crossmember gusset fasteners must be re-torqued to prevent damage from frame vibration and movement.
E306
Service Bulletin/Repair Instructions
PACCAR MX-11 & MX-13 EPA2021 Fuel Filter Drain & Change Info 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 fuel system faults. Misfire, rough running, engine knock, and other associated faults and symptoms. Correct fuel filter procedures are outlined in attached service documentation.
E292 KW
Service Bulletin/Repair Instructions
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.
04-022
Service Bulletin/Repair Instructions
Replacement fuel bezels are available for T680 Next Gen fairings. New bezels have updated attachments to prevent the bezel from becoming loose.
45-065
Service Bulletin/Repair Instructions
Certain T680 Next Gen Cummins X15 have fan hub bracket hardware that is under torqued and could become loose and/or fail. Procedures are available to replace and properly torque the hardware.
42-061
Service Bulletin/Repair Instructions
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.
46-003
Service Bulletin/Repair Instructions
There is currently a repair procedure available for T680E and T880E chassis that will address issues caused by the previous BEV2 R5.00_002 software update. This repair involves replacement of the Bendix ABS control module with an updated version and a software update to R5.00_003.
46-001
Service Bulletin/Repair Instructions
Safety Equipment, Personal Protective Equipment, and Tools have been extensively updated. Due to differences in suppliers and part numbers between the U.S. and Canada, separate lists for the U.S. and Canadian markets have been created to more effectively separate tool requirements and avoid confusion.
E290
Service Bulletin/Repair Instructions
FIX-AS-FAIL Updated procedures and claim filing information. EPA2021 injector cleaning is referenced in RMI for certain injector faults. Complete the procedures in E290. Refer to E300 for in-tank additive information
E300
Service Bulletin/Repair Instructions
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 bulletin for limits and purchase tracking requirements.
R2301
Service Bulletin/Repair Instructions
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. New Engine Emissions and Clean Idle labels will be installed.
03-087 (E295)
Service Bulletin/Repair Instructions
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 developed.
R2202
Service Bulletin/Repair Instructions
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. New Engine Emissions and Clean Idle labels will be installed.
03-085
Service Bulletin/Repair Instructions
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 included.
45-064
Service Bulletin/Repair Instructions
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 cs hardware to deliver secure software updates remotely. This will reduce downtime and save on maintenance costs for eligible vehicles.
E296
Service Bulletin/Repair Instructions
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.