{"nhtsa_id":10204421,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-13","date":"2021-10-29","document_id":"TSB210187","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"This Technical Service Bulletin describes the verification and resolution of a combination of one or all DEF header fault code(s) 3868, 4572 and/or 4677. Due to DEF header part shortages, an ECM calibration is being released that reduces inducement levels until DEF header parts become available for a final repair.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204421-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204421-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10204421","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"B6.7","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"L9","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"X12","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"X15","year_from":null,"year_to":null,"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":[]}