{"nhtsa_id":11028907,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-19","date":"2026-02-19","document_id":"LI54.10-P-080288","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Complaint The check engine light illuminates or the 48 V message is displayed in the instrument cluster Cause Fault code \"P0A7F00\" stored in the 48 V battery G1/3 and/or is current. Remedy 1. Check the SOHc of A66 48V battery. (For SOHr, see LI54.10-P-080199) 2. Carry out SOHc reset routine: - Switch on ignition - Read actual value 209 in XENTRY Diagnostics at G1/3 (48 V battery) \"State of Health Capacity-SOHC\" Valid for OBD markets -- If the value is > 80%, no restoration process required -- If the value is < 81%, continue with the following steps - Discharge Powerpack in vehicle - At SOC < 25%: Stop discharge and bring vehicle to sleep - >1.5h after vehicle sleep: Start engine and charge Powerpack to SOC >65% - At SOC > 65%: Stop operation and bring vehicle to sleep - >1.5h after vehicle sleep: Turn ignition on - Read Diagnostic Service C0C3 (State of Health Capacity - SOHC): if - Capacity > 74%: You can clear fault memory. Procedure finished. - Capacity < 74%: Repeat step 7 again. If after 2 repetitions value is still too high: Read diagnostic service FEE0 - FEE7 (Battery Analysis Protocol Part 1-8) and replace 48V Powerpack.Perform capacity restoration procedure: Valid for OBD markets - SOH > 82%: Process is complete and clear fault memory - SOH < 83%: Repeat the steps once more. If the value is still too low after 5 repetitions: Cancel healing process and provide feedback in TIPS case to the HV/LV team inbox labeled \"SOHc cannot be reset\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028907-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028907-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028907","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P0A7F"],"topics":[],"vehicles":[{"make":"MERCEDES-BENZ","model":"AMG C43","year_from":2023,"year_to":2024,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"AMG C43 4MATIC","year_from":2023,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"AMG C63 S E","year_from":2024,"year_to":2024,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"AMG C63 S E 4MATIC+","year_from":2024,"year_to":2025,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"AMG C63 S 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300","year_from":2023,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"GLC 300 4MATIC","year_from":2023,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"GLC 300 4MATIC COUPE","year_from":2024,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"GLC 300 COUPE","year_from":2024,"year_to":2024,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"GLC 350 E 4MATIC","year_from":2025,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"GLC43 4MATIC COUPE","year_from":2026,"year_to":2026,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"S 500","year_from":2021,"year_to":2021,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"S 500","year_from":2023,"year_to":2023,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"S 500 4MATIC","year_from":2022,"year_to":2025,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"S 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4MATIC","year_from":2025,"year_to":2025,"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":[]}