# Service bulletin TSBTRA079

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.

- Type: Service bulletin
- NHTSA id: 10144237
- Published by NHTSA: 2018\-09\-10
- Manufacturer's number: TSBTRA079
- Manufacturer's date: 2018\-08\-13
- NHTSA component: POWER TRAIN

## NHTSA's summary

TSB: SERVICE ACTION: HCU/TCU LOGIC IMPROVEMENT FOR DTC P1744 \(400 MESH EQUIPPED TRANS\) \(SA351\) \- This bulletin provides the procedure to improve the logic of the Hybrid Control Unit \(HCU\) and the Transmission Control Unit \(TCU\) on some 2013\-2015MY Optima Hybrid \(TF HEV\) vehicles, produced from September 27, 2012 through September 5, 2014, which may experience a malfunction indicator lamp illumination with DTC P1744. To correct this concern, apply the improved logic to the HCU and TCU using the KDS ECU Upgrade function as described in this bulletin.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10144237-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10144237-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Trouble codes named

P1744

## Vehicles listed

- 2013 to 2015 KIA OPTIMA HYBRID

## Other bulletins for the same vehicles and component

- [TSB\_TRA046\_R5](/bulletins/11017172.md), 2025-04-23, Service bulletin: POWER TRAIN. TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, and the transmission oil cooler is transferred to the new transmission.
- [TSB\_TRA046\_R4](/bulletins/11000787.md), 2024-06-04, Service bulletin: POWER TRAIN. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced.
- [TSB\_TRA046\_R3](/bulletins/10226555.md), 2022-12-06, Service bulletin: POWER TRAIN. TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE \- This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, refer to applicable vehicles in the chart starting on page 2.
- [TSB\_TRA059](/bulletins/10183610.md), 2020-12-04, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. TECHNICAL SERVICE BULLETIN: HCU/TCU UPGRADE \- FOR 100 MESH SOLENOID EQUIPPED HYBRID TRANSMISSIONS \-This bulletin provides information related to a software upgrade of the Hybrid Control Unit \(HCU\) and the Transmission Control Unit \(TCU\) of some 2011\-2016 MY Optima Hybrid \(TF HEV\) vehicles after replacement of the transmission with improved 100 mesh solonoid filters has taken place. To apply the improved logic, the HCU/TCU should be reprogrammed using the GDS/KDS download, as described in this bulletin.
- [TSB\_TRA046\_R1](/bulletins/10174520.md), 2020-05-05, Service bulletin: POWER TRAIN. TECHNICAL SERVICE BULLETIN: \- TRANSMISSION FLUID APPLICATION GUIDE \- This bulletin has been revised to include additional information. This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush is required ONLY when a transmission is replaced, refer to applicable vehicles on page 2. Refer to the shop manual on KGIS for the specific Kia model for the correct transmission fluid check/fill procedures.
- [VPI1802\_TSB\_R2](/bulletins/10145156.md), 2018-10-09, Service bulletin: ENGINE; EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). PRODUCT IMPROVEMENT CAMPAIGN \(PI1802\) \- TSB \- KNOCK SENSOR DETECTION SYSTEM \- ECU LOGIC IMPROVEMENT \(PI1802\) \- This bulletin provides information related to a software update to the Engine Control Unit \(ECU\) to install the Knock Sensor Detection System \(KSDS\) in order to protect the engine from excessive connecting rod bearing damage.
- [TSBTRA068\_CLOSED](/bulletins/10144235.md), 2018-09-10, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. TSB: HCU/TCU LOGIC IMPROVEMENT FOR DTC P1744 \(400 MESH EQUIPPED TRANSMISSIONS ONLY\) \- TSB TRA068 CLOSED. REFER TO TSB TRA079/SA351
- [VPI1802\_QA](/bulletins/10143474.md), 2018-08-06, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:SOFTWARE; ENGINE; POWER TRAIN. Q \& A \- This document is the Q \& A for the new Product Improvement Campaign to provide information regarding a software update to the Engine Control Unit \(ECU\) to protect the engine from excessive connecting rod bearing damage.
- [VPI1802\_DSM](/bulletins/10143472.md), 2018-08-06, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. DEALER SERVICE MANAGER NOTICE \- This notice advised the dealer service manager of the new Product Improvement Campaign to perform a software update to the Engine Control Unit \(ECU\) to protect the engine from excessive connecting rod bearing damage.
- [TSBTRA059\_R4](/bulletins/10136505.md), 2018-05-14, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN. TSB \- HCU/TCU UPGRADE ? FOR 100MESH SOLENOID \- EQUIPPED HYBRID TRANSMISSIONS \- This bulletin has been revised to include additional information. This bulletin provides information related to a software upgrade of the Hybrid Control Unit \(HCU\) and the Transmission Control Unit \(TCU\) of some 2011\-2016MY Optima Hybrid \(TF HEV\) after replacement of the transmission with improved 100 mesh solenoids has taken place.

JSON: [/v1/bulletins/10144237](/v1/bulletins/10144237)

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