{"nhtsa_id":11027036,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-01-06","date":"2025-12-18","document_id":"25-EM-007H TSB","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated Thermal-Management Module (ITM). Follow the service procedure in this bulletin to install a spring onto the thermostat within the ITM, in order to prevent premature opening, and perform an ECU software update on affected vehicles.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11027036-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11027036-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11027036","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P2181"],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"ELANTRA","year_from":2021,"year_to":2023,"match":"exact","vehicle_ids":["2021_hyundai_elantra","2022_hyundai_elantra","2023_hyundai_elantra"]},{"make":"HYUNDAI","model":"KONA","year_from":2022,"year_to":2025,"match":"exact","vehicle_ids":["2022_hyundai_kona","2023_hyundai_kona","2024_hyundai_kona","2025_hyundai_kona"]},{"make":"HYUNDAI","model":"SONATA HYBRID","year_from":2020,"year_to":2023,"match":"base","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":[]}