{"nhtsa_id":10203758,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-02","date":"2021-11-11","document_id":"D21M7","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Detroit Field Service Campaign for GHG21 Detroit DD16® CPC Software Reprogramming. All the vehicles in the population require programming the CPC. Some vehicles require programming the ACM, MCM, and TCM (if equipped with a Detroit DT12 transmission) to Model Year 2021 for compatibility. Please refer to the attached work instructions for MINIMUM software versions.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203758-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203758-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203758","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"WESTERN STAR","model":"49X","year_from":2021,"year_to":2022,"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":[]}