{"nhtsa_id":10203297,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-11-08","date":"2021-06-17","document_id":"C2380","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"This campaign is being issued to recalibrate the Engine Control Module (ECM) on certain MY20 L9 engines in True Series and Series Parallel Hybrid buses. This campaign enables authorized repair locations to calibrate the engine control modules to the latest revision. This calibration update may provide improvements to the monitoring frequency of certain on-board diagnostics in order to meet the in-use monitor performance ratio (IUMPR) requirements.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203297-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203297-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203297","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"L9","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":[]}