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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 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
34-0772019-05-13. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT:ELECTRICAL. Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
34-0722019-01-07. Service bulletin. EQUIPMENT. Information: J1939 CAN BUS Best Practices
32-0102018-05-21. Service bulletin. ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. Information only - Customer installed inverters may be wired incorrectly.
18-0082018-02-12. Service bulletin. WHEELS:HUB; WHEELS. Fix-As-Fail ? There is an updated plug to fix leaking steer axle hubcaps.
7-172018-02-12. Service bulletin. WHEELS:HUB; WHEELS. Fix-As-Fail ? There is an updated plug to fix leaking steer axle hubcaps.
34-0602017-10-12. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; TRAILER HITCHES. Non Safety Campaign: The circuit for the Trailer Hotline/Trailer Power may not be properly protected on Model T680/T880 vehicles equipped with this option.
43-0482017-10-12. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. Fix-As-Fail: Repair for horizontal exhaust diffuser configurations with broken brackets or cracked diffuser.
41-0162017-03-27. Service bulletin. EQUIPMENT; ENGINE. NON-SAFETY CAMPAIGN: REPLACE THE MOLDED AIR INTAKE PIPE, WHICH CAN CRACK AND ALLOW ROAD DEBRIS INTO THE ENGINE. DEBRIS ENTERING THROUGH THE INTAKE MAY CAUSE SEVERE ENGINE DAMAGE.
16-0382017-02-18. Service bulletin. POWER TRAIN:AXLE ASSEMBLY. NON-SAFETY CAMPAIGN: WATSON & CHALIN LIFT AXLE FRAME BRACKETS WITH SLOTTED LOWER MOUNTING HOLES MAY EXHIBIT CRACKING WHEN FASTENERS ARE POSITIONED AT THE UPPER PORTION OF THE SLOT. INSTALLING A DOUBLER PLATE MAY PREVENT CRACKS FROM DEVELOPING. FOR VEHICLES WHERE CRACKING IS EVIDENT, A NEW UPDATED SIDE PLATE WILL BE INSTALLED.
01-0682017-02-18. Service bulletin. EQUIPMENT. FIX-AS-FAIL: AN INTERNAL ISSUE MAY CAUSE SOME HVAC MODE DOOR ACTUATORS TO FAIL. THIS WILL CAUSE THE HVAC SYSTEM TO ACT ERRATICALLY OR CONSTANTLY TURN ON AND OFF.
27-0262017-02-18. Service bulletin. ENGINE. FIX-AS-FAIL - ENGINE OVER-SPEED LAMP COULD COME ON AFTER A DOWNSHIFT WITH THE EATON ULTRASHIFT PLUS TRANSMISSION. THIS DOES NOT AFFECT THE FUNCTION OF THE VEHICLE.
04-0172017-02-17. Service bulletin. EQUIPMENT. FIX-AS-FAIL: THE HEAT-STAKE MOUNTING STUDS USED TO RETAIN THE FIXED PANEL COVER CAN FATIGUE. THIS COULD RESULT IN THE FORWARD CHASSIS FAIRING PANEL BECOMING LOOSE AND RATTLING.
E1172016-07-07. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. PRODUCT IMPROVEMENTS AVAILABLE FRONT ENGINE ACCESSORY DRIVE (FEAD) UPDATE - IMPROVE THE LIFE OF AIR CONDITIONING COM0RESSOR CLUTCH BEARING.
TIB-23-0012014-10-29. Service bulletin. POWER TRAIN:CLUTCH ASSEMBLY:PEDAL/HAND LEVER(MOTORCYCLE). KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. DUE TO DEVELOPING BORATE SALT CRYSTALS FROM A BATCH OF DOT4 FLUID, CAUSING A BLOCKAGE IN CLUTCH MASTER CYLINDER AND NOT ABLE TO COMPRESS CLUTCH OR POOR PEDAL FEEL. MODEL 2013 T680, 880. *PE UPDATED 1/6/15. *PE
TIB-26-0252014-10-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. DURING ASSEMBLY, OIL SUPPLY LINE HAD NOT BEEN PROPERLY SEATED AND RESULTED IN OIL PRESSURE TO BEARINGS BEING REDUCED. MODEL 2014 T680. *PE
TIB-42-0522014-10-24. Service bulletin. EQUIPMENT. KENWORTH: TWO RELATED ISSUES CONCERNING MISDIAGNOSE LOW COOLANT CONDITION AND UNNECESSARY COOLANT PUMP REPLACEMENT DUE TO NOT ABLE TO DIFFERENTIATE BETWEEN NORMAL SEEPAGE OF COOLANT AND A TRUE LEAKAGE FROM PUMP. MODEL T680, T880. *PE
TIB-E-0872014-08-16. Service bulletin. ENGINE. KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. A MAX GOVERNED CC SPEED, ON SOME TRUCKS, WAS PROGRAMMED INCORRECTLY AND LIMITS MAXIMUM DEFAULT SPEED TO 63 MPH. *PE
TIB-34-0532014-08-15. Service bulletin. EXTERIOR LIGHTING. KENWORTH: WHILE DRIVING SOME TRUCKS, THE COMBINATION OVERDOOR LAMP WILL FLICKER AND DEFECTIVE LAMPS WILL NEED TO BE REPLACED. MODEL T680. *PE
TIB-13-0372014-08-15. Service bulletin. EQUIPMENT. KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. ON SOME TRUCKS, THE AIR DRYER BRACKET WILL CRACK AND BECOME LOOSE, RESULTING IN FAILURE. MODEL T680. *PE

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.