{"nhtsa_id":10251294,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2024-03-05","date":"2024-02-29","document_id":"24-FL-002H","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-10251294-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-10251294-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10251294","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"engine-control-module","name":"Engine control module","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA","year_from":2020,"year_to":2023,"match":"exact","vehicle_ids":["2020_hyundai_sonata","2021_hyundai_sonata","2022_hyundai_sonata","2023_hyundai_sonata"]}],"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":[]}