{"nhtsa_id":10212542,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-05-31","date":"2022-01-13","document_id":"TSB210020-011320","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM","mfr_system":null,"summary":"This Technical Service Bulletin describes the verification and resolution of an issue with Allison Transmission® Fault P2637 being caused by the Engine Control Module (ECM) Calibration. Cummins is releasing ECM calibration revisions that reduce occurrences of Allison Transmission® fault P2637.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10212542-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10212542-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10212542","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"},{"id":"engine-control-module","name":"Engine control module","parent":"engine"}],"codes":["P2637"],"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":"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":[]}