Service bulletins for the 2021 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.
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Only bulletins with component: Exhaust and emissions are shown. Show all
| 43-072 | 2023-07-05. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING. Certain chassis with Engine Model Year 2016-2021 PACCAR MX-11/MX-13, or EPA13 and EPA21 Cummins ISX12/ISX15/X15 engines that had a previously failed DEF sensor and with DEF sensor software disabled due to industry DEF sensor shortages will now be able to receive a replacement DEF sensor, DEF tank heater coolant control valve, and re-enabled DEF diagnostic software. Please note that chassis equipped with PACCAR PX engines will be eligible for this repair at a future date when software is available. |
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| E275 | 2021-01-06. Service bulletin. ENGINE; EQUIPMENT:OTHER:LABELS; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. Non-Safety Campaign - Vehicles included in Model Year 2021 Pre-Production Engine program have an Emissions Exemption label that must be replaced. The current Emissions Exemption label will expire on 12/31/2020 and requires a new label to extend the exempt |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.