2023 Kenworth T680 Technical Service Bulletins

83 technical service bulletins (TSBs) are on record for the 2023 Kenworth T680. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11027063Dec 16, 2025Transmission and drivetrain, Electrical system. 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.
• 11026414Nov 26, 2025Electrical system, Transmission and drivetrain. 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.
• 11026429Nov 14, 2025Transmission and drivetrain. Campaign Certain chassis equipped with an Eaton Endurant 12-speed transmission have Mechatronic Transmission Module (MTM) rail cylinder cap screws that could become loose. This may cause the transmission not to shift and the transmission service lamp to illuminate. Repair procedure is now available.
• 11026419Nov 10, 2025Transmission and drivetrain. Certain chassis equipped with a PACCAR TX-12 transmission have Mechatronic Transmission Module (MTM) rail cylinder cap screws that could become loose. This may cause the transmission not to shift and the transmission service lamp to illuminate.
• 11024956Oct 28, 2025Brakes. 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.
• 11022490Aug 1, 2025Exterior lighting. Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. Parts and procedures for Phase 2 chassis will be available at a later date. This bulletin will be updated at that time. Please refer to the condition section for more details.
• 11021404Jul 3, 2025Engine. 32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this warranty policy.
• 11017895Apr 30, 2025Electrical system. 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.
• 11017901Apr 9, 2025Electrical system. 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…
• 11014732Feb 12, 2025Electrical system. 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.
• 11000748Jun 1, 2024Body and structure. 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.
• 11000765May 21, 2024Engine. Campaign Certain PACCAR MX-13 engines contain bolts for the main bearing caps which may fail under certain conditions.
• 11000869May 8, 2024Electrical system, Transmission and drivetrain. A software update is available for T680E Battery Electric Vehicles. This software update corrects certain issues with odometer and cold weather operation.
• 10254164Apr 9, 2024Brakes. 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 “Air Brake Systems”. This bulletin will be updated when repair parts and procedures are available.
• 10252589Mar 21, 2024Transmission and drivetrain, Electrical system. Safety Recall – 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 within the wire harness connector. Loss of communication between the right-hand shift stalk and the transmission may result in the vehicle becoming disabled after it comes to a stop…
• 10244493Oct 18, 2023Body and structure. 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.
• 10244489Oct 18, 2023Fuel system. 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…
• 10244497Oct 3, 2023Engine 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.
• 10243362Sep 1, 2023Body and structure. Replacement fuel bezels are available for T680 Next Gen fairings. New bezels have updated attachments to prevent the bezel from becoming loose.
• 10243358Sep 1, 2023Engine cooling, Transmission and drivetrain. 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.
• 10241537Aug 31, 2023Electrical 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.
• 10241500Aug 1, 2023Electrical system. 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.
• 10240234Jul 13, 2023Electrical system, Equipment. 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.
• 10238389Jun 28, 2023Engine cooling, Fuel system. 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
• 10233554Mar 31, 2023Engine cooling. 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
• 10233553Mar 31, 2023Engine 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 bulletin for limits and purchase tracking requirements.
• 10233383Mar 24, 2023Engine 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. New Engine Emissions and Clean Idle labels will be installed.
• 10232496Feb 24, 2023Engine cooling, Fuel system. 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.
• 10232158Feb 17, 2023Electrical system. Battery-Electric Vehicles equipped with Meritor electric drive axles and R5 software may experience incorrect operation of certain components: The power gauge will display axle speed instead of actual power usage. The air conditioner compressor will not operate below 10 mph (16 kph) or over 40 mph (65 kph). The HVAC Blower and heater will operate normally. Low air and low coolant audible alarms (buzzers) will not…
• 10231100Jan 12, 2023Engine 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. New Engine Emissions and Clean Idle labels will be installed.
• 10225582Oct 25, 2022Lane departure. 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.
• 10225578Oct 18, 2022Engine 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 cs hardware to deliver secure software updates remotely. This will reduce downtime and save on maintenance costs for eligible vehicles.
• 10218895Aug 3, 2022Engine 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.

← All problems reported for the 2023 Kenworth T680