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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 14 (BRAKE CONTROL SYSTEM (DIAGNOSTICS) (HEV))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1983: HIGH FREQUENCY OPERATION
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

DTC C1983: High Frequency Operation

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION DTC C1983: High Frequency Operation
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

DTC Detecting condition: 

This malfunction is stored if the electronic parking brake is operated with high frequency in a short period of time.

Trouble symptom: 

Parking brake system does not operate sometimes.

  1. CHECK OUTPUT OF AMBIENT SENSOR USING SUBARU SELECT MONITOR  .

    Using the Subaru Select Monitor, read data of [Ambient Temp Sensor] in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DATA MONITOR .

    Is the reading of [Ambient Temp Sensor] within the range of ±10 [°C] to the ambient temperature?

    Yes:  Go to  2.

    No:  Repair the ambient sensor circuit.

  2. CHECK VDCCM AND H/U  .
    1. Turn the ignition switch to OFF.
    2. Stop the vehicle for approximately one hour.
    3. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    4. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>INSPECTION MODE .
    5. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is the same DTC displayed?

    Yes:  Replace the VDCCM and H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

    No:  Go to  3.

  3. CHECK DETECTION OF OTHER DTCS FOR VDC  .

    Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is any other DTC displayed?

    Yes:  Perform the diagnosis according to the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.