{"nhtsa_id":11026829,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-12-24","date":"2025-12-18","document_id":"LI07.70-P-078547","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Complaint Engine idle fluctuates or stumbles at approximately 7 second interval. No relevant fault codes are stored. If fault codes are stored or check engine light illuminated, this should be diagnosed separately. Cause Torque signal mismatch between MRG and PTCU control units. Only effects version 20B of PTCU. Remedy Update software of powertrain control unit N127. New software version: MY 2022- A2549021611 MY 2023- A2549023610","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11026829-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11026829-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11026829","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MERCEDES-BENZ","model":"C 300","year_from":2022,"year_to":2023,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"C 300 4MATIC","year_from":2022,"year_to":2023,"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":[]}