SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVEHICLE DYNAMICS CONTROL (VDC) SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1721 YAW RATE SENSORTROUBLE SYMPTOM
2016 Subaru Legacy 2.5i

DTC C1721 Yaw Rate Sensor: 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)
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 INTERVIEW CUSTOMERS. 
Check if the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).		 Did the vehicle run the road with banks or sandy surface (which does not mean a dirt road)? VDCCM & H/U may record DTC when the vehicle ran the road with banks or sandy surface (which does not mean a dirt road). Go to step 2  .
2 CHECK INSTALLATION OF VDCCM & H/U.  Is VDCCM & H/U installed properly without being tilted?
Is the bracket deformation-free?
Are the VDCCM & H/U installation bolts installed without missing or getting loose?		 Go to step 3  . Repair the defective part.

Go to step 3  .
3 CHECK OUTPUT OF YAW RATE & G SENSOR WITH SUBARU SELECT MONITOR. 
  1. Drive the vehicle on a flat road.
  2. Park the vehicle straight.
  3. Using the Subaru Select Monitor, select "Data monitor". < Ref. to READ CURRENT DATA , OPERATION, Subaru Select Monitor. >
  4. Read the «Yaw Rate Sensor» displayed on display.
 Is the reading indicated on monitor display -4 - 4 deg/s? Go to step 4  . Replace the VDCCM & H/U. < Ref. to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) . >
4 CHECK OUTPUT OF STEERING ANGLE SENSOR WITH SUBARU SELECT MONITOR. 
  1. Drive the vehicle on a flat road.
  2. Park the vehicle straight.
  3. Using the Subaru Select Monitor, select "Data monitor". < Ref. to READ CURRENT DATA , OPERATION, Subaru Select Monitor. >
  4. Read the «Steering Angle Sensor» displayed on display.
 Is the reading indicated on monitor display -10 - 10°? Go to step 5  . Perform the centering adjustment of steering wheel.
5 CHECK VDCCM & H/U. 
  1. Turn the ignition switch to OFF.
  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

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.