# Service bulletin TSB\_TRA106\_R1

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: 10235107
- Published by NHTSA: 2023\-04\-28
- Manufacturer's number: TSB\_TRA106\_R1
- Manufacturer's date: 2023\-04\-06
- NHTSA component: POWER TRAIN

## NHTSA's summary

TECHNICAL SERVICE BULLETIN: 6\-SPEED DCT JUDGEMENT LOGIC IMPROVEMENT / GROUND BOLT TIGHTENING \(P074A73\) \- 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 to tighten both the clutch actuator and transmission control unit \(TCU\) grounding bolts, and upgrade the software logic of the 6\-speed dual clutch transmission \(DCT\) on some 2023MY Niro P/HEV vehicles produced from June 14, 2022 through December 12, 2022, which may exhibit a poor shift quality concern and MIL \&\#39;ON\&\#39; with DTC P074A73 stored.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10235107-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10235107-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

P074A

## Vehicles listed

- 2023 KIA NIRO PHEV

## Recalls for the same vehicles and component

- [24V271000](/recalls/nhtsa/24V271000.md), 2024-04-16: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT
- [2024054](/recalls/tc/2024054.md), 2024-01-31: Powertrain
- [24V057000](/recalls/nhtsa/24V057000.md), 2024-01-31: POWER TRAIN:DRIVELINE:DRIVESHAFT

## Other bulletins for the same vehicles and component

- [SC345Z\_TSB](/bulletins/11024346.md), 2025-10-17, Service bulletin: POWER TRAIN. TECHNICAL SERVICE BULLETIN: SUBSEQUENT REPAIR ACTION: FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT \(SC345Z\) \- This bulletin provides information regarding grinding or whining noise coming from the front motor reduction gear assembly after replacing the oil under SC345 \(published in August 2025\) on certain 2023\-2024MY Niro EV \(SG2 EV\) vehicles produced from December 12, 2022 through February 7, 2024 and EV6 \(CV\) vehicles produced from December 14, 2022 through February 22, 2024. In rare cases, the front motor reduction gear assembly may exhibit noise after having the oil replaced.
- [SC345\_TSB](/bulletins/11022351.md), 2025-09-02, Service bulletin: POWER TRAIN. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN FRONT MOTOR REDUCTION GEAR OIL REPLACEMENT \(SC345\) \- This bulletin provides information to replace the front motor reduction gear assembly gear oil on certain 2023\-2024MY Niro EV \(SG2 EV\) vehicles produced from December 12, 2022 through February 7, 2024 and EV6 \(CV\) vehicles produced from December 14, 2022 through February 22, 2024. During the production of the subject vehicles, the amount of gear oil in the front motor and reduction gear assembly may have been filled below factory specification. If the gear oil level is lower than Kia’s factory specifications, the subject vehicles may eventually produce a grinding noise or whining noise from the front of the vehicle while driving.
- [SC345\_QA](/bulletins/11021988.md), 2025-08-20, Service campaign: POWER TRAIN. VOLUNTARY SERVICE CAMPAIGN: QUESTION AND ANSWER \(SC345\) \- This document is the Question and Answer Guide containing the most frequently asked questions regarding the Voluntary Service Campaign SC.
- [SC345\_OWNR\_SG2](/bulletins/11021987.md), 2025-08-20, Service campaign: POWER TRAIN. VOLUNTARY SERVICE CAMPAIGN: OWNER NOTIFICATION \(SC345\) \- This document is the owner notification advising that Kia is conducting a Voluntary Service Campaign to replace the gear oil in the front motor and gear reduction assembly, and fill it to the factory\-specified amount in certain Niro EV vehicles, manufactured from December 12, 2022 through February 7, 2024.
- [SC345\_DPSM](/bulletins/11021985.md), 2025-08-20, Service campaign: POWER TRAIN. VOLUNTARY SERVICE CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO \(SC345\) \- This document is the announcement to the dealer Parts and Service managers advising that Kia is conducting a Voluntary Service Campaign to replace the gear oil in the front motor and gear reduction assembly, and fill it to the factory\-specified amount in certain 2023\-2024MY EV6 vehicles, manufactured from December 14, 2022 through February 22, 2024 and Niro EV vehicles, manufactured from December 12, 2022 through February 7, 2024.
- [SC345\_DP](/bulletins/11021984.md), 2025-08-20, Service campaign: POWER TRAIN. VOLUNTARY SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO \(SC345\) \- This document is the announcement to the dealer principals advising that Kia is conducting a Voluntary Service Campaign to replace the gear oil in the front motor and gear reduction assembly, and fill it to the factory\-specified amount in certain 2023\-2024MY EV6 vehicles, manufactured from December 14, 2022 through February 22, 2024 and Niro EV vehicles, manufactured from December 12, 2022 through February 7, 2024.
- [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\_TRA106](/bulletins/10231842.md), 2023-03-06, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. TECHNICAL SERVICE BULLETIN: 6\-SPEED DCT JUDGEMENT LOGIC IMPROVEMENT / GROUND BOLT TIGHTENING \(P074A73\) \- This bulletin provides information to tighten both the clutch actuator and transmission control unit \(TCU\) grounding bolts then, upgrade the software logic of the 6\-speed dual clutch transmission \(DCT\) on some 2023MY Niro P/HEV vehicles produced from June 14, 2022 through December 12, 2022, which may exhibit a poor shift quality concern and MIL "ON" with DTC P074A73 stored.
- [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.

JSON: [/v1/bulletins/10235107](/v1/bulletins/10235107)

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