{"nhtsa_id":11024536,"type":"service_campaign","type_name":"Service campaign","date_added":"2025-10-29","date":"2025-10-21","document_id":"25-01-076H TSB","mfr_campaign":"TEBA","replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Certain Sonata Hybrid (DN8 HEV) vehicles may experience battery drain due to the air conditioning controller not shutting down completely while the vehicle is parked and turned off. This bulletin provides instructions to perform a software update for the ATCU (Air Temperature Control Unit).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024536-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11024536-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11024536","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA HYBRID","year_from":2024,"year_to":2026,"match":"base","vehicle_ids":["2024_hyundai_sonata","2025_hyundai_sonata","2026_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":[]}