{"nhtsa_id":10154961,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-03-25","date":"2019-02-26","document_id":"C2052B","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL","mfr_system":null,"summary":"This field action authorizes certified repair locations to upfit certain ISX15 CM2250 engines rated at 525hp-600hp and All ISX12 CM2250 engines (regardless of HP Rating) with an improved Selective Catalytic Reduction (SCR) Catalyst. This is an update to a previously submitted communication.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10154961-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10154961-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10154961","components":[{"id":"engine","name":"Engine","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"labels-manuals","name":"Labels and manuals","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"ISX12","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"CUMMINS","model":"ISX15","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":[]}