{"nhtsa_id":11030932,"type":"emissions","type_name":"Emissions","date_added":"2026-04-07","date":"2026-03-25","document_id":"E335","mfr_campaign":"E335","replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Expiration Date Format Update - Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will be installed.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11030932-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11030932-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11030932","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"T680","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_kenworth_t680","2022_kenworth_t680"]},{"make":"KENWORTH","model":"T880","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_kenworth_t880","2022_kenworth_t880"]},{"make":"KENWORTH","model":"W990","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_kenworth_w990","2022_kenworth_w990"]},{"make":"PACCAR","model":"MX-13","year_from":2021,"year_to":2021,"match":null,"vehicle_ids":[]},{"make":"PETERBILT","model":"389","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_peterbilt_389","2022_peterbilt_389"]},{"make":"PETERBILT","model":"567","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_peterbilt_567","2022_peterbilt_567"]},{"make":"PETERBILT","model":"579","year_from":2021,"year_to":2022,"match":"exact","vehicle_ids":["2021_peterbilt_579","2022_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":[]}