{"nhtsa_id":10123331,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-11-14","date":"2017-10-12","document_id":"TSBTRA068","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"TSB - HCU/TCU LOGIC IMPROVEMENT FOR DTC P1744 (400 MESH EQUIPPED TRANSMISSIONS ONLY) - This bulletin provides the procedure to improve the logic of the Hybrid Control Unit (HCU) on some 2011-2012MY Optima Hybrid (TF HEV), produced from February 15, 2011 through December 28, 2012, and both the Hybrid Control Unit (HCU) and the Transmission Control Unit (TCU) on some 2013-2015MY Optima Hybrid (TF HEV) vehicles, produced from January 15, 2013 through March 27, 2015, which may experience a malfunction indicator lamp illumination with DTC P1744. To correct this concern, apply the improved logic to the HCU only (11-12MY) or HCU and TCU (13-15MY) using the KDS ECU Upgrade function as described in this bulletin. For confirmation that the latest reflash has been applied to a vehicle you are working on, verify the ROM ID using the table on page 3 of this bulletin.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10123331-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10123331-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10123331","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P1744"],"topics":[],"vehicles":[{"make":"KIA","model":"OPTIMA HYBRID","year_from":2011,"year_to":2015,"match":"base","vehicle_ids":["2011_kia_optima","2012_kia_optima","2013_kia_optima","2014_kia_optima","2015_kia_optima"]}],"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":[]}