{"nhtsa_id":11036293,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-08-20","date":"2026-08-13","document_id":"43-089","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"This optional software update is expected to be available in late August 2026 for chassis equipped with EPA 2024 EMY 2024-2026 PACCAR MX-11 and MX-13 engines. This bulletin will be updated when the software is ready. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance. The procedure document has also been updated for clarity.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036293-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036293-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11036293","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"L770","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_kenworth_l770","2025_kenworth_l770","2026_kenworth_l770"]},{"make":"KENWORTH","model":"T680","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_kenworth_t680","2025_kenworth_t680","2026_kenworth_t680"]},{"make":"KENWORTH","model":"T880","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_kenworth_t880","2025_kenworth_t880","2026_kenworth_t880"]},{"make":"KENWORTH","model":"W900","year_from":2024,"year_to":2025,"match":null,"vehicle_ids":[]},{"make":"KENWORTH","model":"W900B","year_from":2024,"year_to":2025,"match":null,"vehicle_ids":[]},{"make":"PETERBILT","model":"520","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_peterbilt_520","2025_peterbilt_520","2026_peterbilt_520"]},{"make":"PETERBILT","model":"567","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_peterbilt_567","2025_peterbilt_567","2026_peterbilt_567"]},{"make":"PETERBILT","model":"579","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_peterbilt_579","2025_peterbilt_579","2026_peterbilt_579"]},{"make":"PETERBILT","model":"589","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_peterbilt_589","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":[]}