# Service bulletins for the 2014 Kenworth T680

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

44 bulletins from NHTSA, as of 2026-10-19.

- [42\-070](/bulletins/11038569.md), 2026-10-17, Service bulletin: UNKNOWN OR OTHER. Due to supplier constraints, an authorized aftermarket surge tank has been made available.
- [P001](/bulletins/11037541.md), 2026-09-29, Service bulletin: ENGINE. "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."
- [02\-177](/bulletins/11033351.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM. Troubleshooting procedures for 2.1m cab power windows are now available.
- [24KWD](/bulletins/10254164.md), 2024-05-04, Service bulletin: 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 “Air Brake Systems”. This bulletin will be updated when repair parts and procedures are available.
- [03\-087 \(E295\)](/bulletins/10232496.md), 2023-03-06, Service bulletin: FUEL SYSTEM, OTHER:FUEL FILTER; ENGINE AND ENGINE COOLING. 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.
- [E296](/bulletins/10218895.md), 2022-08-30, Service bulletin: ENGINE AND ENGINE 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.
- [21KWD](/bulletins/10198762.md), 2021-07-06, Service bulletin: ENGINE AND ENGINE COOLING. Information Only – 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](/bulletins/10198760.md), 2021-07-06, Service bulletin: 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\-160](/bulletins/10188550.md), 2021-03-10, Service bulletin: VISIBILITY; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; VISIBILITY:WINDSHIELD WIPER/WASHER. Information Only – Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
- [32\-018](/bulletins/10188468.md), 2021-03-10, Service bulletin: ENGINE AND ENGINE COOLING. Non\-Safety Campaign – Chassis with the City Horn option may generate unexpected alerts. A VECU software update is available to resolve the issue.
- [32\-017](/bulletins/10188467.md), 2021-03-10, Service bulletin: ELECTRICAL SYSTEM. Non\-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep. Updated VECU software is available to resolve the issue.
- [51\-008](/bulletins/10186164.md), 2021-02-01, Service bulletin: EQUIPMENT. T680 predictive cruise control\(PCC\) incompatibility with cummins engine.
- [27\-026](/bulletins/10186161.md), 2021-02-01, Service bulletin: POWER TRAIN; ENGINE. Eaton ultrashift plus excessive engine over\-speed lamp on.
- [26\-037](/bulletins/10185190.md), 2021-01-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. Fix\-As\-Fail \- Prior versions of Eaton Endurant transmission software may be prone to setting Linear Clutch Actuator \(LCA\) fault codes leading to possible LCA hardware replacement.
- [32\-015](/bulletins/10177021.md), 2020-07-03, Service bulletin: ELECTRICAL SYSTEM. Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
- [34\-085](/bulletins/10173212.md), 2020-04-03, Service bulletin: VEHICLE SPEED CONTROL; ELECTRICAL SYSTEM. Information Only – Vehicles may have the connector seals on the wheel speed sensor incorrectly installed, which may lead to water intrusion and corrosion in some vehicles.
- [32\-016](/bulletins/10173205.md), 2020-04-03, Service bulletin: EQUIPMENT. Information Only: Proper jump\-starting voltage will eliminate high voltage related issues and equipment damage.
- [32\-013](/bulletins/10171030.md), 2020-02-05, Service bulletin: ELECTRICAL SYSTEM. Information Only: The AutoStart System Test does not recognize the hood opening and closing when running the test on a model 579 or 567 chassis equipped with a VECU software version 9.8 and 9.9. The issue will be fixed on a future VECU software update. This bulletin will be updated when the resolution is available.
- [03\-071](/bulletins/10169787.md), 2020-01-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Information Only \- Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer. The issue can be temporarily resolved using any one of the included procedures.
- [43\-063](/bulletins/10169706.md), 2020-01-04, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Emissions Campaign – The Engine Overspeed lamp may illuminate during a smoke opacity test. A software update is available to resolve the issue.
- [01\-071](/bulletins/10168709.md), 2019-12-04, Service bulletin: ENGINE AND ENGINE COOLING. Fix\-As\-Fail The evaporator core may crack in vehicles with the ISX\-15 engine. An improved suction line has been released that removes stress transferred to the evaporator core.
- [01\-075](/bulletins/10168703.md), 2019-12-04, Service bulletin: ENGINE AND ENGINE COOLING. Information Only: This bulletin provides guidance for repairing an air\-conditioning system after internal failure of the A/C compressor.
- [TIB43\-062](/bulletins/10165583.md), 2019-10-04, Service bulletin: EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. Information Only – This bulletin provides information about the California Air Resources Board \(CARB\) Periodic Smoke Inspection Program \(PSIP\) and Heavy Duty Vehicle Inspection Program \(HDVIP\).
- [42\-058](/bulletins/10164375.md), 2019-09-05, Service bulletin: ENGINE AND ENGINE COOLING. Fix\-As\-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination.
- [01\-073](/bulletins/10164369.md), 2019-09-05, Service bulletin: EQUIPMENT; EQUIPMENT:APPLIANCE:AIR CONDITIONER. Fix as Fail HVAC system may demonstrate inadequate temperature control, be stuck in defrost mode, or have intermittent changes in fan speed that can be remedied with an updated HVAC software.

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