Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2014LEGACY 2.5I, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN COMMUNICATION SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC U1223 CAN-HS VDC NO-RECEIVE DATATROUBLE SYMPTOM
2014 Subaru Legacy 2.5i, Automatic CVT Trans
DTC U1223 Can-HS VDC No-Receive Data: Trouble Symptom
2014 Subaru Legacy 2.5i, Automatic CVT TransSECTION Trouble Symptom
ABS warning light and VDC warning light illuminate.
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK CAN COMMUNICATION CIRCUIT. Check CAN communication circuit. Refer to BUS "A" (MAIN-CAN) . |
Is CAN communication circuit faulty? | Repair the faulty portion, following the diagnosis procedure. | Go to step 2 . |
2 CHECK DTC.
|
Is U1223 a current malfunction? | Go to step 3 . | It may be a temporary poor contact. Perform the clear memory. |
| 3 CHECK DTC. Using the Subaru Select Monitor, read DTC of all the systems. |
Is U0122 or P1718 detected? | Replace the VDC CM. Refer to REMOVAL . | Replace the body integrated unit. Refer to REMOVAL . |
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.