{"nhtsa_id":10126427,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-12-22","date":"2017-11-22","document_id":"TSBENG177B","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"TSB - SERVICE ACTION: 2.4L SHIFT QUALITY & WAKE-UP LOGIC IMPROVEMENT (SA316B) - This bulletin provides the procedure to improve the logic of the Electronic Control Unit (ECU) and Transmission Control Unit (TCU) on some 2018MY Optima (JFa) 2.4L, produced from April 18, 2017 through September 7, 2017, and some 2018MY Sorento (UMa) 2.4L vehicles, produced from March 31, 2017 through October 19, 2017, which may experience an extended crank and/or a shift quality concern, such as a hard downshift, upshift, and/or shift delay.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10126427-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10126427-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10126427","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KIA","model":"OPTIMA","year_from":2018,"year_to":2018,"match":"exact","vehicle_ids":["2018_kia_optima"]},{"make":"KIA","model":"SORENTO","year_from":2018,"year_to":2018,"match":"exact","vehicle_ids":["2018_kia_sorento"]}],"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":[]}