{"nhtsa_id":10213054,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-06-02","date":"2022-05-16","document_id":"LI82.95-P-074845","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Complaint The \"SOS nonfunctional\" message displays intermittently in the instrument cluster of the vehicle. The fault code B129C00 is stored in the control unit log. The message usually occurs after the vehicle has been non-operational for an extended period of time; then the message disappears after a few minutes. The emergency call system is functioning when tested. Cause Software in N112/9 control unit for telematics services (HERMES). Remedy Software update for control unit N112/9 - Control unit for telematics services (HERMES) to software release E522.7.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10213054-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10213054-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10213054","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["B129C"],"topics":[],"vehicles":[{"make":"MERCEDES-BENZ","model":"MERCEDES-BENZ","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":[]}