{"nhtsa_id":10146960,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-05","date":"2016-11-01","document_id":"B612216","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"\"SME FC 21F284 \"\"HIGH-VOLTAGE BATTERY UNIT, CELL SUPERVISION CIRCUIT: SAFETY CIRCUIT ACTIVATED\"\". Vehicle is not able to be put in a driving readiness state. Possible power reduction with \"\"Drivetrain Malfunction\"\" message while driving. Fault code (FC) \"\"21F284 -:\"\"High-voltage battery unit, cell supervision circuit: Safety circuit activated\"\" is entered in the fault memory (FM) of the battery management electronics (SME) A fault in one or more of the following components: cell supervision circuit (CSC) CSC wiring harness cell module temperature sensor 12 volt connector of cell module\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10146960-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2016/MC-10146960-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10146960","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"I3","year_from":2014,"year_to":2017,"match":"exact","vehicle_ids":["2014_bmw_i3","2015_bmw_i3","2016_bmw_i3","2017_bmw_i3"]}],"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":[]}