{"nhtsa_id":10187156,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-02-16","date":"2021-01-29","document_id":"TSB210020-012920","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM","mfr_system":null,"summary":"This Technical Service Bulletin describes the verification and resolution of Allison Transmission Fault P2637 caused by engine control module calibration.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10187156-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10187156-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10187156","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P2637"],"topics":[],"vehicles":[{"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":[]}