Subaru Crosstrek Service Manual: Dtc c0044 tcm communication circuit

DTC detecting condition:

No CAN signal from TCM.

Trouble symptom:

• ABS does not operate.

• VDC does not operate.

• EyeSight does not operate.

1.CHECK LAN SYSTEM.

Perform the diagnosis for LAN system. Basic Diagnostic Procedure">

Is there any fault in LAN system?

Perform the diagnosis according to DTC for LAN system. List of Diagnostic Trouble Code (DTC)">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0044 TCM COMMUNICATION CIRCUIT">Go to Step 2.

2.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of TCM connector?

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0044 TCM COMMUNICATION CIRCUIT">Go to Step 3.

3.CHECK TCM.

Refer to the basic diagnostic procedure for Transmission (diagnostics).

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0044 TCM COMMUNICATION CIRCUIT">Go to Step 4.

Replace the TCM. Transmission Control Module (TCM)">

4.CHECK VDCCM&H/U.

1) Perform the Clear Memory Mode. Clear Memory Mode">

2) Perform the Inspection Mode. Inspection Mode">

3) Read the DTC. Read Diagnostic Trouble Code (DTC)">

Is the same DTC displayed?

Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0044 TCM COMMUNICATION CIRCUIT">Go to Step 5.

5.CHECK DETECTION OF OTHER DTCS FOR VDC.

Read Diagnostic Trouble Code (DTC)">

Is any other DTC displayed?

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)">

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

Dtc c0042 power supply voltage failure

Dtc c0047 can communication

Other materials:

Removal
CLUTCH SYSTEM > Release Bearing and LeverREMOVAL1. Remove the transmission assembly from the vehicle. Manual Transmission Assembly > REMOVAL">2. Remove the two clips from the release lever and remove the release bearing.CAUTION:Be careful not to deform the clips.3. Remove the dust cove ...

Inspection
COOLING(H4DO) > ThermostatINSPECTION1. Check that the thermostat does not have deformation, cracks or damage.2. Check that the thermostat valve closes completely at an ambient temperature.3. Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and check the temper ...

Interruption screen
Warning information (display example) Useful messages, such as reminder information, vehicle information, warning information, etc. may interrupt the current screen and appear on the display accompanied by a beep. Take proper action according to the message. The warning screen will retu ...