# P1744 on the 2011 Kia Optima

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1744

- [10144235](https://open.wenmarpro.com/bulletins/10144235), 2018-09-10: TSB: HCU/TCU LOGIC IMPROVEMENT FOR DTC P1744 \(400 MESH EQUIPPED TRANSMISSIONS ONLY\) \- TSB TRA068 CLOSED. REFER TO TSB TRA079/SA351
- [10123331](https://open.wenmarpro.com/bulletins/10123331), 2017-11-14: 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.