{"nhtsa_id":10189815,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-04-05","date":"2021-04-05","document_id":"SR21-81A","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"ALLISON TRANSMISSION C1 HUB FAILURE – TRANSMISSION CONTROL MODULE REPROGRAMMING AND C1 HUB REPLACEMENT","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10189815-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10189815-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10189815","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"VOLVO BUS","model":"9700","year_from":2015,"year_to":2020,"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":[]}