{"nhtsa_id":10149255,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-26","date":"2017-05-01","document_id":"B612517","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:12V/24V/48V BATTERY","mfr_system":null,"summary":"SME - HV BATTERY CELL MODULE VOLTAGE FAULTS. When diagnosing with ISTA or ISTA Next, a fault code (detailed below), regarding the cell voltage measurement, is entered in the battery management electronics (SME). ? 21F0C2 - High-voltage battery, cell supervision circuit 1: Voltage measurement (battery cell), line disconnection ? 21F0C3 - High-voltage battery, cell supervision circuit 2: Voltage measurement (battery cell), line disconnection ? 21F0C4 - High-voltage battery, cell supervision circuit 3: Voltage measurement (battery cell), line disconnection ? 21F0C5 - High-voltage battery, cell supervision circuit 4: Voltage measurement (battery cell), line disconnection ? 21F0C6 - High-voltage battery, cell supervision circuit 5: Voltage measurement (battery cell), line disconnection The customer might not have reported the situation as the fault code could have no effect on the vehicle operation. Erroneous fault in the fault memory of the SME, possible fault in a cell supervision circuit (CSC) or a cell module.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10149255-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10149255-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10149255","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"battery","name":"12-volt battery","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"320I","year_from":2013,"year_to":2017,"match":"exact","vehicle_ids":["2013_bmw_320i","2014_bmw_320i","2015_bmw_320i","2016_bmw_320i","2017_bmw_320i"]},{"make":"BMW","model":"328D","year_from":2014,"year_to":2017,"match":"exact","vehicle_ids":["2014_bmw_328d","2015_bmw_328d","2016_bmw_328d","2017_bmw_328d"]},{"make":"BMW","model":"328I","year_from":2012,"year_to":2016,"match":"exact","vehicle_ids":["2012_bmw_328i","2013_bmw_328i","2014_bmw_328i","2015_bmw_328i","2016_bmw_328i"]},{"make":"BMW","model":"330E","year_from":2016,"year_to":2017,"match":"exact","vehicle_ids":["2016_bmw_330e","2017_bmw_330e"]},{"make":"BMW","model":"330I","year_from":2017,"year_to":2017,"match":"exact","vehicle_ids":["2017_bmw_330i"]},{"make":"BMW","model":"335I","year_from":2012,"year_to":2016,"match":"exact","vehicle_ids":["2012_bmw_335i","2013_bmw_335i","2014_bmw_335i","2015_bmw_335i","2016_bmw_335i"]},{"make":"BMW","model":"340I","year_from":2016,"year_to":2017,"match":"exact","vehicle_ids":["2016_bmw_340i","2017_bmw_340i"]}],"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":[]}