{"nhtsa_id":11033379,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-06-03","date":"2026-05-26","document_id":"T024","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033379-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033379-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11033379","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"T280","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_t280","2026_kenworth_t280"]},{"make":"KENWORTH","model":"T380","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_t380","2026_kenworth_t380"]},{"make":"KENWORTH","model":"T480","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_t480","2026_kenworth_t480"]},{"make":"KENWORTH","model":"T680","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_t680","2026_kenworth_t680"]},{"make":"KENWORTH","model":"T880","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_t880","2026_kenworth_t880"]},{"make":"KENWORTH","model":"W990","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_kenworth_w990","2026_kenworth_w990"]},{"make":"PETERBILT","model":"537","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_peterbilt_537","2026_peterbilt_537"]},{"make":"PETERBILT","model":"548","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_peterbilt_548","2026_peterbilt_548"]},{"make":"PETERBILT","model":"567","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_peterbilt_567","2026_peterbilt_567"]},{"make":"PETERBILT","model":"579","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_peterbilt_579","2026_peterbilt_579"]},{"make":"PETERBILT","model":"589","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_peterbilt_589","2026_peterbilt_589"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}