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.
2017 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Vehicle Dynamics Control System DTCS
VEHICLE DYNAMICS CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE IDENTIFICATION
| DTC | Item | Content of diagnosis | Reference |
|---|---|---|---|
| C1211 | Front Right ABS Sensor Circuit | Open/high input of front ABS wheel speed sensor RH | <Ref. to DTC C1211 FRONT RIGHT ABS SENSOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1212 | Front Right ABS Sensor Signal | Front ABS wheel speed sensor RH signal malfunction | <Ref. to DTC C1212 FRONT RIGHT ABS SENSOR SIGNAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1221 | Front Left ABS Sensor Circuit | Open/high input of front ABS wheel speed sensor LH | <Ref. to DTC C1221 FRONT LEFT ABS SENSOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1222 | Front Left ABS Sensor Signal | Front ABS wheel speed sensor LH signal malfunction | <Ref. to DTC C1222 FRONT LEFT ABS SENSOR SIGNAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1231 | Rear Right ABS Sensor Circuit | Open/high input of rear ABS wheel speed sensor RH | <Ref. to DTC C1231 REAR RIGHT ABS SENSOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1232 | Rear Right ABS Sensor Signal | Rear ABS wheel speed sensor RH signal malfunction | <Ref. to DTC C1232 REAR RIGHT ABS SENSOR SIGNAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1241 | Rear Left ABS Sensor Circuit | Open/high input of rear ABS wheel speed sensor LH | <Ref. to DTC C1241 REAR LEFT ABS SENSOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1242 | Rear Left ABS Sensor Signal | Rear ABS wheel speed sensor LH signal malfunction | <Ref. to DTC C1242 REAR LEFT ABS SENSOR SIGNAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1311 | FR Hold Valve | Front inlet solenoid valve RH malfunction in VDCCM & H/U | <Ref. to DTC C1311 FR HOLD VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1312 | FR Pressure Reducing Valve | Front outlet solenoid valve RH malfunction in VDCCM & H/U | <Ref. to DTC C1312 FR PRESSURE REDUCING VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1321 | FL Hold Valve | Front inlet solenoid valve LH malfunction in VDCCM & H/U | <Ref. to DTC C1321 FL HOLD VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1322 | FL Pressure Reducing Valve | Front outlet solenoid valve LH malfunction in VDCCM & H/U | <Ref. to DTC C1322 FL PRESSURE REDUCING VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1331 | RR Hold Valve | Rear inlet solenoid valve RH malfunction in VDCCM & H/U | <Ref. to DTC C1331 RR HOLD VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1332 | RR Pressure Reducing Valve | Rear outlet solenoid valve RH malfunction in VDCCM & H/U | <Ref. to DTC C1332 RR PRESSURE REDUCING VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1341 | RL Hold Valve | Rear inlet solenoid valve LH malfunction in VDCCM & H/U | <Ref. to DTC C1341 RL HOLD VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1342 | RL Pressure Reducing Valve | Rear outlet solenoid valve LH malfunction in VDCCM & H/U | <Ref. to DTC C1342 RL PRESSURE REDUCING VALVE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1351 | Normal Opening Valve 1 | Secondary cut valve malfunction in VDCCM & H/U | <Ref. to DTC C1351 NORMAL OPENING VALVE 1 , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1352 | Normal Opening Valve 2 | Primary cut valve malfunction in VDCCM & H/U | <Ref. to DTC C1352 NORMAL OPENING VALVE 2 , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1361 | Normal Closing Valve 1 | Secondary suction valve malfunction in VDCCM & H/U | <Ref. to DTC C1361 NORMAL CLOSING VALVE 1 , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1362 | Normal Closing Valve 2 | Primary suction valve malfunction in VDCCM & H/U | <Ref. to DTC C1362 NORMAL CLOSING VALVE 2 , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1411 | Electrical Control Module | VDC control module malfunction | <Ref. to DTC C1411 ELECTRICAL CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1412 | Selected Parameter | VDC control module parameter failure | <Ref. to DTC C1412 SELECTED PARAMETER , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1413 | Power Supply Voltage | Power voltage malfunction | <Ref. to DTC C1413 POWER SUPPLY VOLTAGE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1423 | VDC Interruption for Engine Convenience | VDC interrupted due to some reasons of the engine | <Ref. to DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1423 | Different ECU Specifications | Different VDC control module specification | <Ref. to DTC C1423 DIFFERENT ECU SPECIFICATIONS , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1424 | ECM | Engine control module is faulty | <Ref. to DTC C1424 ECM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1431 | AT | Transmission control module is faulty | <Ref. to DTC C1431 AT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1511 | Valve Relay | Defective valve relay | <Ref. to DTC C1511 VALVE RELAY , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1521 | Motor Relay | Motor relay malfunction | <Ref. to DTC C1521 MOTOR RELAY , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1531 | BLS Off Stuck | Stop light switch malfunction | <Ref. to DTC C1531 BLS OFF STUCK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1532 | BLS On Stuck | Stop light switch malfunction | <Ref. to DTC C1532 BLS ON STUCK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1571 | Brake Lamp Relay Off Stuck | Brake light relay malfunction | <Ref. to DTC C1571 BRAKE LAMP RELAY OFF STUCK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1711 | Steering Angle Sensor | Steering angle sensor malfunction | <Ref. to DTC C1711 STEERING ANGLE SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1721 | Yaw Rate Sensor | Defective yaw rate sensor | <Ref. to DTC C1721 YAW RATE SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1732 | Lateral G Sensor | Defective lateral G sensor | <Ref. to DTC C1732 LATERAL G SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1733 | Longitudinal G Sensor | Defective longitudinal G sensor | <Ref. to DTC C1733 LONGITUDINAL G SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1741 | Pressure Sensor | Defective pressure sensor | <Ref. to DTC C1741 PRESSURE SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1742 | Wheel Cylinder Pressure Sensor | Defective pressure sensor | <Ref. to DTC C1742 WHEEL CYLINDER PRESSURE SENSOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1811 | System | System malfunction | <Ref. to DTC C1811 SYSTEM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1921 | Parking Position Switch Circuit | Parking switch malfunction | <Ref. to DTC C1921 PARKING POSITION SWITCH CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1922 | Hill Hold Switch Circuit | Hill hold switch malfunction | <Ref. to DTC C1922 HILL HOLD SWITCH CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1935 | Ignition Switch Circuit | No match of IGN input | <Ref. to DTC C1935 IGNITION SWITCH CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1942 | Power Supply Voltage | Electronic parking brake power supply voltage is faulty | <Ref. to DTC C1942 POWER SUPPLY VOLTAGE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1951 | Actuator | Electronic parking brake actuator line is faulty | <Ref. to DTC C1951 ACTUATOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1954 | RH Actuator | Electronic parking brake RH actuator is faulty | <Ref. to DTC C1954 RH ACTUATOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1955 | LH Actuator | Electronic parking brake LH actuator is faulty | <Ref. to DTC C1955 LH ACTUATOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1956 | RH Actuator Circuit | RH actuator circuit malfunction | <Ref. to DTC C1956 RH ACTUATOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1957 | LH Actuator Circuit | LH actuator circuit malfunction | <Ref. to DTC C1957 LH ACTUATOR CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1983 | High Frequency Operation | Electronic parking brake operation is too frequent | <Ref. to DTC C1983 HIGH FREQUENCY OPERATION , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1984 | Brake Maintenance Mode | Executing brake maintenance mode | <Ref. to DTC C1984 BRAKE MAINTENANCE MODE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| C1985 | Forbidden State of Dynamic Actuator Operation | Electronic parking brake actuator is faulty | <Ref. to DTC C1985 FORBIDDEN STATE OF DYNAMIC ACTUATOR OPERATION , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0073 | Control Module Communication Bus Off | Defective CAN communication | <Ref. to DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0100 | Lost Communication With ECM/PCM "A" | Defective CAN communication | <Ref. to DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0101 | Lost Communication With TCM | Defective CAN communication | <Ref. to DTC U0101 LOST COMMUNICATION WITH TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0126 | Lost Communication With Steering Angle Sensor Module | Defective CAN communication | <Ref. to DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0140 | Lost Communication With Body Control Module | Defective CAN communication | <Ref. to DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | Defective CAN communication | <Ref. to DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0401 | Invalid Data Received From ECM/PCM "A" | Defective CAN communication | <Ref. to DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0402 | Invalid Data Received From TCM | Defective CAN communication | <Ref. to DTC U0402 INVALID DATA RECEIVED FROM TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0422 | Invalid Data Received From Body Control Module | Defective CAN communication | <Ref. to DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0423 | Invalid Data Received From Instrument Panel Cluster Control Module | Defective CAN communication | <Ref. to DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0428 | Invalid Data Received From Steering Angle Sensor Module | Defective CAN communication | <Ref. to DTC U0428 INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U1235 | Lost Communication With EyeSight | Defective CAN communication | <Ref. to DTC U1235 LOST COMMUNICATION WITH EYESIGHT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U1433 | Invalid Data Received From EyeSight | Defective CAN communication | <Ref. to DTC U1433 INVALID DATA RECEIVED FROM EYESIGHT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
Factory Service Tools
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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.
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