{"nhtsa_id":11029088,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-28","date":"2026-02-27","document_id":"LI54.71-P-080157","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Complaint Driver assistance system warning messages in instrument cluster. MUST be in conjunction with a fault code in control unit N62/5 IDC (driver assistance systems): • B1D9198 (Stored) - The \"Driver assistance system\" control unit is malfunctioning. Overtemperature in the component or system. Under certain circumstances, additional fault codes may be present in N125 CDCC_EV (central controller for charging and driving). Cause Air in the low-temperature circuit Remedy 1. Do not replace any parts 2. Perform a leak test on the low-temperature circuit 3. Perform a visual check of the coolant connection on the N62/5 control unit 4. Perform the bleeding routine via XENTRY and WIS. 5. Check the coolant level and top up if necessary (see WIS references) If this does not remedy the problem, please open a TIPS case to Body/Chassis/Entertainment.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029088-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029088-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11029088","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["B1D91"],"topics":[],"vehicles":[{"make":"MERCEDES-BENZ","model":"CLA 250+ (EV)","year_from":2026,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"CLA 350 4MATIC (EV)","year_from":2026,"year_to":2026,"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":[]}