{"nhtsa_id":10186820,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-02-06","date":"2021-01-14","document_id":"21-AT-001H","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"This bulletin provides the procedure to update the TCU for a rough idle in Drive with Neutral Control enabled. The rough idle may occur only at a stop in Drive with the A/C off and the ATF temperature between 158~210°F (70~99°C). This update also reduces vibration when the brake is released during Neutral Control operation and the accelerator pedal is depressed.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10186820-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10186820-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10186820","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"HYUNDAI","model":"SONATA","year_from":2018,"year_to":2019,"match":"exact","vehicle_ids":["2018_hyundai_sonata","2019_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":[]}