{"nhtsa_id":10233557,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-04-04","date":"2023-03-31","document_id":"23-EE-004H","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"This bulletin provides information related to the Hybrid Control Unit (HCU) software update for Santa Fe Plug-in Hybrid (TM PHEV) vehicles to improve the following symptom: 1. Oil Dilution: Some vehicles may experience increased oil consumption and white smoke due to the diluting of engine oil with fuel because of the frequent transition between EV ↔ Engine mode during the winter season a. Modify fuel injection strategy below 10℃ and add oil heating function based on the driving pattern.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10233557-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10233557-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10233557","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SANTA FE PLUG-IN HYBRID","year_from":2021,"year_to":2023,"match":"base","vehicle_ids":["2021_hyundai_santa-fe","2022_hyundai_santa-fe","2023_hyundai_santa-fe"]}],"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":[]}