{"vehicle":{"id":"2023_hyundai_sonata","year":2023,"make":"Hyundai","model":"Sonata"},"code":"P2181","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":2,"bulletins":[{"nhtsa_id":11028666,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-10","date":"2026-02-05","document_id":"26-EM-003H TSB","mfr_campaign":null,"component":"ENGINE","summary":"Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Engine Control Module, resulting in an illuminated Check Engine warning lamp. Follow the procedure in this TSB to replace the Integrated Thermal Management (ITM) module and update both the Engine Control Module (ECM) and Transmission Control Module (TCM) if applicable. Follow the flowchart in this TSB to update the appropriate modules.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028666-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028666-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028666"},{"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,"component":"ENGINE","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"}],"url":"https://open.wenmarpro.com/makes/hyundai/sonata/2023/bulletins?code=P2181"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/hyundai/sonata/2023/codes/P2181","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}