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Service bulletins for the 2023 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.

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

By type

By component

By topic

Bulletins, newest first
E3002023-04-04. Service bulletin. ENGINE AND ENGINE 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.
R23012023-04-04. Service bulletin. ENGINE AND ENGINE 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.
03-087 (E295)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.
46-0032023-03-01. Service bulletin. ELECTRICAL 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 operate below 10 mph (16 kph). Low air and low coolant visual warnings will operate normally.
R22022023-02-06. Service bulletin. ENGINE AND ENGINE 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.
03-0852022-11-02. Service bulletin. LANE DEPARTURE: BLIND SPOT DETECTION. 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.
45-0642022-11-02. Service bulletin. ENGINE AND ENGINE 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.
E2962022-08-30. 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.

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