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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVEHICLE DYNAMICS CONTROL (VDC) SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCETROUBLE SYMPTOM
2016 Subaru Legacy 2.5i

DTC C1422 VDC Interruption For Engine Convenience: Trouble Symptom

2016 Subaru Legacy 2.5iSECTION Trouble Symptom
  • VDC does not operate.
  • Hill hold does not function.
    NOTE: The warning light goes off if the engine control prohibition flag from ECM returns normally.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR. 
  1. Start the engine, and run the engine at idle approximately 5 minutes.
  2. Using the Subaru Select Monitor, select "Data monitor". < Ref. to READ CURRENT DATA , OPERATION, Subaru Select Monitor. >
  3. Check the «E/G Torque Down Control Stop Flag» displayed on screen.
 Does the «E/G Torque Down Control Stop Flag» indicate "1"? Go to step 4  . Go to step 2  .
2 CHECK WARNING LIGHT. 
Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.		 Does the VDC warning light illuminate? Go to step 3  . VDC is normal. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . >
NOTE: DTC may be recorded if cranking is performed during driving.
3 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of ECM connector? Repair the connector. Go to step 4  .
4 CHECK ENGINE SYSTEM. 
Refer to the basic diagnostic procedure of ENGINE (DIAGNOSTICS).		 Is ECM normal? Go to step 5  . Check the engine system.
5 CHECK VDCCM & H/U. 
  1. Connect all connectors.
  2. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . >
  3. Perform the Inspection Mode. < Ref. to INSPECTION MODE . >
  4. Read the DTC. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >
 Is the same DTC displayed? Replace the VDCCM & H/U. < Ref. to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) . > Go to step 6  .
6 CHECK DETECTION OF OTHER DTCS FOR VDC. 
< Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >		 Is any other DTC displayed? Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference.
RENDER: 1.0x

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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.