{"nhtsa_id":11035202,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-07-23","date":"2026-07-21","document_id":"43-088","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and MX-13 engines. 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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11035202-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11035202-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11035202","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"L770","year_from":2024,"year_to":2025,"match":"exact","vehicle_ids":["2024_kenworth_l770","2025_kenworth_l770"]},{"make":"KENWORTH","model":"T680","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_kenworth_t680","2021_kenworth_t680","2022_kenworth_t680","2023_kenworth_t680","2024_kenworth_t680","2025_kenworth_t680"]},{"make":"KENWORTH","model":"T880","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_kenworth_t880","2021_kenworth_t880","2022_kenworth_t880","2023_kenworth_t880","2024_kenworth_t880","2025_kenworth_t880"]},{"make":"KENWORTH","model":"T880B","year_from":2020,"year_to":2021,"match":"base","vehicle_ids":["2020_kenworth_t880","2021_kenworth_t880"]},{"make":"KENWORTH","model":"W990","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_kenworth_w990","2021_kenworth_w990","2022_kenworth_w990","2023_kenworth_w990","2024_kenworth_w990","2025_kenworth_w990"]},{"make":"PETERBILT","model":"365","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_365","2021_peterbilt_365","2022_peterbilt_365","2023_peterbilt_365","2024_peterbilt_365","2025_peterbilt_365"]},{"make":"PETERBILT","model":"367","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_367","2021_peterbilt_367","2022_peterbilt_367","2023_peterbilt_367","2024_peterbilt_367","2025_peterbilt_367"]},{"make":"PETERBILT","model":"389","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_389","2021_peterbilt_389","2022_peterbilt_389","2023_peterbilt_389","2024_peterbilt_389","2025_peterbilt_389"]},{"make":"PETERBILT","model":"520","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_520","2021_peterbilt_520","2022_peterbilt_520","2023_peterbilt_520","2024_peterbilt_520","2025_peterbilt_520"]},{"make":"PETERBILT","model":"567","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_567","2021_peterbilt_567","2022_peterbilt_567","2023_peterbilt_567","2024_peterbilt_567","2025_peterbilt_567"]},{"make":"PETERBILT","model":"579","year_from":2020,"year_to":2025,"match":"exact","vehicle_ids":["2020_peterbilt_579","2021_peterbilt_579","2022_peterbilt_579","2023_peterbilt_579","2024_peterbilt_579","2025_peterbilt_579"]}],"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":[]}