May 26, 2026 Service bulletin

KW: A Transmission Control Module (TCM) software update is now available for certain T280, T380, T480,...

Kenworth technical service bulletin T024 for 2025-2026 Kenworth T680, 2025-2026 Peterbilt 579 and 2025-2026 Kenworth T880 and others.

Bulletin number: T024
Component: Power train
Summary: KW: A Transmission Control Module (TCM) software update is now available for certain T280, T380, T480, T680, T880, and W990 chassis with PACCAR TX-12 and TX-18 transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails. PB: A Transmission Control Module (TCM) software update is now available for certain Model 537, 548, 567, 579, and 589 chassis with PACCAR TX-12 and TX-18 transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails.

Owners of these vehicles have filed 1 complaints in the transmission category.

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