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: Heating and air conditioning are shown. Show all
| 21-KWE | 2021-09-03. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. Safety Recall – Interim Notification - Certain Mahle HVAC control heads may have a soldering defect which may result in inoperative HVAC controls. Inoperative HVAC defrost may reduce driver visibility, increasing the risk of an accident. This bulletin will be updated when parts become available. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.