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.
2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Vehicle Dynamics Control (VDC) System (Diagnostics)
- Basic Diagnostic Procedure
- Check List for Interview
- Check
- Notes
- State Of Abs Warning Light
- State Of VDC Warning Light & VDC Indicator Light
- State Of VDC Off Indicator Light
- State Of Brake Warning Light
- Condition Of Electronic Parking Brake Operation Indicator Light
- Electronic Parking Brake Warning Light Condition
- Condition Of Hill Start Assist Warning Light
- Conditions Under Which Trouble Occurs
- Check
- General Description
- Electrical Component Location
- Control Module I/O Signal
- Subaru Select Monitor
- Read Diagnostic Trouble Code (DTC)
- Inspection Mode
- Clear Memory Mode
- Warning Light Illumination Pattern
- Inspection
- EBD Warning Light, Abs Warning, VDC Off Indicator Light, VDC Warning Light And VDC Indicator Light Do Not Come On
- Hill Start Assist Warning Light Does Not Come On
- Electronic Parking Brake Indicator Light Do Not Come On
- AVH On Indicator Light Do Not Come On
- Electronic Parking Brake Indicator Light Is Blinking
- AVH On Indicator Light Come On
- AVH Operation Indicator Light Come On
- Abs Warning Light Does Not Go Off
- VDC Warning Light And VDC Indicator Light Do Not Go Off
- Electronic Parking Brake Indicator Light Do Not Go Off
- VDC Off Indicator Light Does Not Go Off
- Hill Start Assist Warning Light Does Not Go Off
- Brake Warning Light Does Not Go Off
- VDC Mode Does Not Change
- List of Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC C1211: Front Right Abs Sensor Circuit
- DTC C1221: Front Left Abs Sensor Circuit
- DTC C1231: Rear Right Abs Sensor Circuit
- DTC C1241: Rear Left Abs Sensor Circuit
- DTC C1212: Front Right Abs Sensor Signal
- DTC C1222: Front Left Abs Sensor Signal
- DTC C1232: Rear Right Abs Sensor Signal
- DTC C1242: Rear Left Abs Sensor Signal
- DTC C1311: Fr Hold Valve
- DTC C1312: Fr Pressure Reducing Valve
- DTC C1321: Fl Hold Valve
- DTC C1322: Fl Pressure Reducing Valve
- DTC C1331: RR Hold Valve
- DTC C1332: RR Pressure Reducing Valve
- DTC C1341: RL Hold Valve
- DTC C1342: RL Pressure Reducing Valve
- DTC C1351: Normal Opening Valve 1
- DTC C1352: Normal Opening Valve 2
- DTC C1361: Normal Closing Valve 1
- DTC C1362: Normal Closing Valve 2
- DTC C1411: Electrical Control Module
- DTC C1412: Selected Parameter
- DTC C1413: Power Supply Voltage
- DTC C1422: VDC Interruption For Engine Convenience
- DTC C1423: Different Ecu Specifications
- DTC C1424: ECM
- DTC C1431: At
- DTC C1511: Valve Relay
- DTC C1521: Motor Relay
- DTC C1531: BLS Off Stuck
- DTC C1532: BLS On Stuck
- DTC C1571: Brake Lamp Relay Off Stuck
- DTC C1711: Steering Angle Sensor
- DTC C1721: Yaw Rate Sensor
- DTC C1732: Lateral G Sensor
- DTC C1733: Longitudinal G Sensor
- DTC C1741: Pressure Sensor
- DTC C1742: Wheel Cylinder Pressure Sensor
- DTC C1811: System
- DTC C1921: Parking Position Switch Circuit
- DTC C1923: Auto Vehicle Hold Switch Circuit
- DTC C1935: Ignition Switch Circuit
- DTC C1942: Power Supply Voltage
- DTC C1951: Actuator
- DTC C1954: RH Actuator
- DTC C1955: LH Actuator
- DTC C1956: RH Actuator Circuit
- DTC C1957: LH Actuator Circuit
- DTC C1983: High Frequency Operation
- DTC C1984: Brake Maintenance Mode
- DTC C1985: Forbidden State Of Dynamic Actuator Operation
- DTC U0073: Control Module Communication Bus Off
- DTC U0100: Lost Communication With ECM/Pcm "A"
- DTC U0101: Lost Communication With TCM
- DTC U0126: Lost Communication With Steering Angle Sensor Module
- DTC U0140: Lost Communication With Body Control Module
- DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U0401: Invalid Data Received From ECM/Pcm "A"
- DTC U0402: Invalid Data Received From TCM
- DTC U0422: Invalid Data Received From Body Control Module
- DTC U0423: Invalid Data Received From Instrument Panel Cluster Control Module
- DTC U0428: Invalid Data Received From Steering Angle Sensor Module
- DTC U1235: LOST COMMUNICATION WITH EyeSight
- DTC U1433: INVALID DATA RECEIVED FROM EyeSight
- General Diagnostic Table
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.