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.

• 11038711Oct 13, 2026Other or unknown. Removed hyperlinks for bulletin migration
• 11037622Oct 1, 2026Body and structure. Certain T680 Next Gen short hood chassis may be missing a bolt in the forward fairing.
• 11037549Sep 23, 2026Electrical system. This bulletin, the troubleshooting procedure, and the BMS Troubleshooting Checklist have been updated to show that the Autometer tool test results can be used in place of the Midtronics tool test results for fulfilling service and warranty requirements.
• 11037546Sep 23, 2026Other or unknown. Certain Kenworth EMY 2022 T680, T880 and W990 chassis may not contain an EAS operator’s manual in the vehicle’s glovebox literature packet.
• 11037541Sep 11, 2026Engine. "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
• 11037451Sep 5, 2026Engine. An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
• 11036341Aug 20, 2026Other or unknown. "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…
• 11036291Aug 13, 2026Forward collision avoidance. The verbiage in the Introduction section has been updated.
• 11036289Aug 13, 2026Engine. 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.
• 11035202Jul 21, 2026Engine. This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
• 11035150Jul 18, 2026Engine. 7/17/2026: Removed filter on KW Chassis List.
• 11035149Jul 18, 2026Engine. Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
• 11035147Jul 10, 2026Engine. 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.
• 11035112Jul 10, 2026Engine. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
• 11035108Jul 7, 2026Engine. "The software is not yet available. The bulletin will be updated when more information is available."
• 11034394Jun 29, 2026Engine. "An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service theirtrucks before a DEF-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."
• 11034286Jun 27, 2026Other or unknown. "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."
• 11034284Jun 25, 2026Engine, Transmission and drivetrain. Multiple fuel injector part numbers have been added to this warranty policy.
• 11034281Jun 25, 2026Transmission and drivetrain, Engine. "KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy."
• 11034063Jun 24, 2026Engine, Transmission and drivetrain. Multiple fuel injector part numbers have been added to this warranty policy.
• 11034060Jun 24, 2026Transmission and drivetrain, Engine. "KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy."
• 11033918Jun 3, 2026Electrical system. "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."
• 11033387May 29, 2026Electrical system. Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.
• 11033354May 15, 2026Engine. Warranty section has been updated to include hood length definitions and filing instructions for progressive damage.
• 11033351May 6, 2026Electrical system. Troubleshooting procedures for 2.1m cab power windows are now available.
• 11033349May 5, 2026Other or unknown. (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
• 11032876May 1, 2026Engine. Procedures have been updated to include additional truck models in the service intervals table.
• 11032296Apr 30, 2026Engine. 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.
• 11032288Apr 30, 2026Engine. Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s manufacturing specifications.
• 11032295Apr 28, 2026Other or unknown. (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation. (PB) Certain Model 367 / 389 / 567 / 579 / 589 have updated GHG labels available for order and installation.
• 11032293Apr 17, 2026Engine. 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.
• 11032290Apr 16, 2026Other or unknown. Bogie Crossmember Torque Value Update - Procedure has been updated to correct torque values.
• 11032289Apr 11, 2026Engine. E335 Warranty wording update Apr 2026
• 11032297Apr 4, 2026Engine. EMY21-25 GHG Label Replacement (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation. (PB) Certain Model 367 / 389 / 567 / 579 / 589 have updated GHG labels available for order and installation.
• 11032284Apr 1, 2026Electrical system, Engine. EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.
• 11030935Mar 28, 2026Other or unknown. 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.
• 11030927Mar 11, 2026Engine. Engine Air Filter Servicing UPDATE - Procedures are available to support the maintenance, service intervals, and intake system inspection process for all engine air intake system components.
• 11030922Mar 6, 2026Engine. EPA17-24 MX-13 Fuel Injector Connector - This bulletin has been revised to include EPA24 PACCAR MX-13 engines.
• 11030916Mar 3, 2026Steering. Sheppard Recall Order Process Update - The Parts section has been updated with revised steps for opening a TCS365 Order Support – Order Inquiry case.
• 11029640Feb 27, 2026Engine. Fuel Injection Pump part number 2344776PEX for MX-13 engines has been added to this warranty policy.
• 11029789Feb 26, 2026Engine. Fuel Injection Pump part number 2344776PEX for EMY2022 MX-13 engines has been added to the Warranty Policy.
• 11029738Feb 11, 2026Electrical system. The Parts section has been updated to clarify that freight charges for safety recall orders should not be passed on to the end customer.
• 11028318Jan 31, 2026Electrical 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.
• 11028314Jan 31, 2026Engine. Procedure pictures updated for clarity. When troubleshooting Cummins X15 fault codes 555 or 556, follow this additional testing, inspection, and documentation procedure to help identify the root cause of dusted engines. This is not a stand-alone process but must be used alongside Cummins troubleshooting steps. Cummins Quickserve will reference this bulletin for fault codes 555 or 556.
• 11028315Jan 29, 2026Transmission and drivetrain. 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..
• 11028312Jan 29, 2026Transmission and drivetrain. 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.
• 11028308Jan 13, 2026Electrical system, Transmission and drivetrain. 24PBE_24KWE RH Shift Stalk Update Warranty section has been updated with revised verbiage for picture requirements.
• 11027058Dec 31, 2025Fuel system. 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.
• 11027065Dec 24, 2025Brakes. 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.
• 11027067Dec 23, 2025Exterior lighting. 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.

← All problems reported for the 2023 Kenworth T680