{"nhtsa_id":10028346,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2009-03-26","date":"2008-11-05","document_id":"TIB-45-35","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:DIESEL","mfr_system":null,"summary":"KENWORTH TRUCKS: PX-8 AND CUMMINS ISL ENGINE CALIBRATION CAMPAIGN C0844. UPGRADE ENGINE CONTROL SOFTWARE FOR PACCAR PX 8 AND CUMMINS ISL ENGINES TO ENHANCE PERFORMANCE AND RELIABILITY. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10028346","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KENWORTH","model":"T300","year_from":2006,"year_to":2008,"match":"exact","vehicle_ids":["2006_kenworth_t300","2007_kenworth_t300","2008_kenworth_t300"]},{"make":"KENWORTH","model":"T800","year_from":2006,"year_to":2008,"match":null,"vehicle_ids":[]},{"make":"KENWORTH","model":"W900","year_from":2006,"year_to":2008,"match":null,"vehicle_ids":[]}],"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":[]}