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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVEHICLE DYNAMICS CONTROL (VDC) SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1423 DIFFERENT ECU SPECIFICATIONSTROUBLE SYMPTOM
2016 Subaru Legacy 2.5i

DTC C1423 Different Ecu Specifications: Trouble Symptom

2016 Subaru Legacy 2.5iSECTION Trouble Symptom
  • ABS does not operate.
  • VDC does not operate.
  • Hill hold does not function.
  • EyeSight does not operate. (Models with EyeSight)
    NOTE: When parameter selection for VDCCM is improper, this DTC may be memorized.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK VDCCM & H/U IDENTIFICATION SYMBOL. 
Check the identification symbol attached on the H/U. < Ref. to SPECIFICATION , General Description. >		 Is the identification symbol correct? Go to step 2  . Replace the VDCCM & H/U. < Ref. to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) . >
2 CHECK PARAMETER SELECTED IN VDCCM. 
< Ref. to VDCCM PARAMETER CHECK , MAINTENANCE MODE, VDC Control Module and Hydraulic Control Unit (VDCCM & H/U). >		 Does the parameter registered in the VDCCM match the relevant vehicle? CVT model: Go to step 3. 
MT model: Go to step 5  .		 Select and register the correct parameter. < Ref. to VDCCM PARAMETER SELECTION , MAINTENANCE MODE, VDC Control Module and Hydraulic Control Unit (VDCCM & H/U). >
3 CHECK TCM SPECIFICATION. 
Check the TCM specification.		 Is the specification of TCM same as vehicle specification? Go to step 4  . Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
4 CHECK CVT SYSTEM. 
  1. Start the engine.
  2. Check the DTC in CVT system. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >
 Is DTC of CVT system displayed? Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 5  .
5 CHECK ECM SPECIFICATION. 
Check the ECM specification.		 Is the specification of ECM same as vehicle specification? Go to step 6  . Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . > < Ref. to ENGINE CONTROL MODULE (ECM) . >
6 CHECK ENGINE SYSTEM. 
  1. Start the engine.
  2. Check DTCs of engine system. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . > < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >
 Is engine system DTC displayed? Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 7  .
7 CHECK VDCCM & H/U. 
  1. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . >
  2. Perform the Inspection Mode. < Ref. to INSPECTION MODE . >
  3. 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 8  .
8 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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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • 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.