Hyundai Tucson: Clutch Actuator & TCM- Assembly Replacement

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / DCT (Dual Clutch Transmission) System / DCT (Dual Clutch Transmission) System (SBW) / Clutch Actuator & TCM- Assembly Replacement


In principle, the Dual Clutch Transmission (DCT) oil is not changed under normal driving conditions.

However, under harsh driving conditions, it must be changed every 80,000 miles.

Harsh driving conditions are as follows:

  • Frequent driving on rough road (Bumpy road, gravel road, snow road, unpaved road, etc.)
  • Frequent driving on mountain road, ascent/descent.
  • Driving for patrol, taxi, commercial car or vehicle towing.
  • Frequent driving under high speed (over 170km)
  • More than 50% driving in heavy city traffic during hot weather above 32ºC (90ºF)
  • driving in areas using salt or other corrosive materials or in very cold weather.
  • Towing a trailer or using a camper on roof rack.
  • Manual transmission oil should be changed any time.

    Manual transmission have been submerged in water.

  1. Remove the engine room under cover.

(Refer to Engine Mechanical System - "Engine Room Under Cover")

  1. Remove the drain plug (A) and drain all the oil. Then install the drain plug with a new gasket.

Tightening torque : 44.1 - 48.8 N.m (4.5 - 6.0 kgf.m, 32.5 - 43.4 lb-ft)



  • The existing gasket (A) must be replaced with a new one. (Do not reuse it.)

New gasket part no.: 45323-39000

  1. Add new oil through the filler plug hole (A) and, fill it just below the plug opening.

Standard oil:

API Service GL-4, SAE 70W

Recommnend oil:


Oil capacity :

1.6 - 1.7L (0.42 - 0.45 U.S.gal., 1.69 - 1.80 U.S. qt., 1.41 - 1.50 Imp qt)

  1. Install the filler plug bolt (A) with new gasket.

Tightening torque : 58.9 - 78.5 N.m (6.0 - 8.0 kgf.m. 43.4 - 57.8 lb-ft)


The existing gasket (A) must be replaced with a new one. (Do not reuse it.)

  1. Install the engine room under cover.

(Refer to Engine Mechanical System - "Engine Room Under Cover")


The Dual Clutch Transmission (DCT) control system measures required data to identify the state of the control target and computes the appropriate compensation value if adjustment is necessary. The actuator is controlled according to the computed compensation value to obtain desired output.

If transmission or driving-performance-related failure is detected, first perform self-diagnosis and basic transmission inspection (oil check).

Then use the diagnostic tool to inspect the transmission control system components.

Operation principle




The Transmission Control Module (TCM) is like the brain for the Dual Clutch Transmission (DCT). It receives information from various sensors for a wide range of transmission controls to provide an optimal driving environment for the driver. The TCM is programmed for optimal operation in all driving conditions. If the TCM malfunctions, store the failure information in memory and provide the error information to a mechanic for fast and accurate repair.


  1. Fork cover
  2. Clutch actuator & TCM assembly
  3.  Clutch actuator assembly
  4. O-ring
  5. DCT control module (TCM)

Connector and Terminal Function




     Transmission Control Module (TCM) Inspection Procedure

    Inspecting TCM ground circuit: Measure the resistance between the TCM and chassis ground. (Check the terminal connected to the chassis ground while using the back of the harness connector as the base point for TCM.) Normal reading (re

     Clutch actuator assembly - Components

    Components Fork cover Clutch actuator & TCM assembly Clutch actuator assembly O-ring DCT control module (TCM) Specification Removal Turn ignition switch OFF and disconnect the battery negative (-) terminal. Remove

     Gear actuator assembly

    Components Gear actuator assembly Specification Connector and Terminal Function Circuit Diagram Removal Turn ignition switch OFF and disconnect the negative (-) battery cable. Remove the air cleaner assembly and ai


     Reverse Parking Distance Warning (PDW)

    Reverse Parking Distance Warning will help warn the driver if an obstacle is detected within a certain distance when the vehicle is moving in reverse at low speeds. Detecting sensor [2] : Rear ultrasonic sensors Refer to the picture above

     System maintenance

    Cabin air filter [A] : Outside air, [B] : Recirculated air [C] : Cabin air filter, [D] : Blower [E] : Evaporator core, [F] : Heater core The cabin air filter is installed behind the glove box. It filters the dust or other pollutants that en