ELECTRONICALLY CONTROLLED BRAKE SYSTEM DIAGNOSTIC TROUBLE CODE CHART

Note

When replacing the brake booster with master cylinder (skid control ECU), sensor, etc., make sure that the power switch is turned off, the stop light switch is off, and 2 minutes have elapsed since the driver's door was closed.

Tech Tips


  • If no abnormality is found when inspecting parts, inspect the skid control ECU and ground points for poor connections.

  • If a trouble code is displayed during the DTC check, check the circuit indicated by the DTC. For details of each code, refer to the page for the respective "DTC Code" in the DTC chart.

  • When 2 or more DTCs are detected, perform circuit inspections one by one until the problem is identified.

  • Inspect the fuses and relays before inspecting the trouble areas as shown in the table below.

ABS DTC
DTC Code Detection Item INF Code Trouble Area See page
42 Electronically Controlled Brake System Malfunction - Electronically controlled brake system

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C1235/35 Foreign Object is Attached on Tip of Front Speed Sensor RH 541

1. Speed sensor rotor malfunction (foreign object attached)

2. Foreign object attached to speed sensor

3. Open or short in speed sensor

4. Open or short in wire harness

5. Improperly connected connector, deformation or corrosion of terminals

6. Resistance in speed sensor circuit

7. Brake booster with master cylinder (Skid control ECU)

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C1236/36 Foreign Object is Attached on Tip of Front Speed Sensor LH 542

1. Speed sensor rotor malfunction (foreign object attached)

2. Foreign object attached to speed sensor

3. Open or short in speed sensor

4. Open or short in wire harness

5. Improperly connected connector, deformation or corrosion of terminals

6. Resistance in speed sensor circuit

7. Brake booster with master cylinder (Skid control ECU)

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C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH 543

1. Speed sensor rotor malfunction (foreign object attached)

2. Foreign object attached to speed sensor

3. Open or short in speed sensor

4. Open or short in wire harness

5. Improperly connected connector, deformation or corrosion of terminals

6. Resistance in speed sensor circuit

7. Brake booster with master cylinder (Skid control ECU)

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C1239/39 Foreign Object is Attached on Tip of Rear Speed Sensor LH 544

1. Speed sensor rotor malfunction (foreign object attached)

2. Foreign object attached to speed sensor

3. Open or short in speed sensor

4. Open or short in wire harness

5. Improperly connected connector, deformation or corrosion of terminals

6. Resistance in speed sensor circuit

7. Brake booster with master cylinder (Skid control ECU)

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C1243/43 Acceleration Sensor Stuck Malfunction

561

562

563

564

 Yaw rate and acceleration sensor internal stuck malfunction

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C1244/44 Open or Short in Acceleration Sensor Circuit 571

1. Yaw rate and acceleration sensor installed improperly

2. Yaw rate and acceleration sensor

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C1245/45 Acceleration Sensor Output Malfunction 581

1. Yaw rate and acceleration sensor installed improperly

2. Yaw rate and acceleration sensor

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C1336/98 Zero Point Calibration of Acceleration Sensor Undone -

1. Zero point calibration undone

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

(Perform zero point calibration and check for DTCs. If no DTCs are output again, the sensor is normal.)

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C1381/97 Acceleration Sensor Power Supply Voltage Malfunction 601

1. Yaw rate and acceleration sensor supply voltage shut down

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

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C1442/44 Invalid Data Received from Acceleration Sensor 572 Yaw rate and acceleration sensor

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C1464/31 Front Speed Sensor RH Circuit

501

502

503

504

506

507

508

1. Open or short in speed sensor

2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor

3. Open or short in wire harness

4. Improperly connected connector, deformation or corrosion of terminals

5. Front speed sensor RH

6. Brake booster with master cylinder (Skid control ECU)

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C1465/32 Front Speed Sensor LH Circuit

511

512

513

514

516

517

518

1. Open or short in speed sensor

2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor

3. Open or short in wire harness

4. Improperly connected connector, deformation or corrosion of terminals

5. Front speed sensor LH

6. Brake booster with master cylinder (Skid control ECU)

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C1466/33 Rear Speed Sensor RH Circuit

521

522

523

524

526

527

528

1. Open or short in speed sensor

2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor

3. Open or short in wire harness

4. Improperly connected connector, deformation or corrosion of terminals

5. Rear speed sensor RH

6. Brake booster with master cylinder (Skid control ECU)

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C1467/34 Rear Speed Sensor LH Circuit

531

532

533

534

536

537

538

1. Open or short in speed sensor

2. Improperly installed speed sensor, or abnormal clearance between sensor and rotor

3. Open or short in wire harness

4. Improperly connected connector, deformation or corrosion of terminals

5. Rear speed sensor LH

6. Brake booster with master cylinder (Skid control ECU)

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U0124/95 Lost Communication with Lateral Acceleration Sensor Module

591

592

1. CAN communication line (CAN No. 1 bus)

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

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VSC DTC
DTC Code Detection Item INF Code Trouble Area See page
43 ABS Control System Malfunction - ABS control system

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45 Electronically Controlled Brake System Malfunction - Electronically controlled brake system

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C1210/36 Zero Point Calibration of Yaw Rate Sensor Undone -

1. Zero point calibration undone

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

(Perform zero point calibration and check for DTCs. If no DTCs are output again, the sensor is normal.)

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C1231/31 Steering Angle Sensor Circuit Malfunction

701

702

703

 Steering angle sensor internal malfunction

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C1234/34 Yaw Rate Sensor Malfunction

711

712

713

714

 Yaw rate and acceleration sensor internal malfunction

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C1290/66 Steering Angle Sensor Zero Point Malfunction 751

1. Yaw rate and acceleration sensor zero point calibration incomplete

2. Poor adjustment of the center position of the steering wheel

3. Poor adjustment of front wheel alignment

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C1310/51 Malfunction in HV system - Power management control ECU

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C1380/64 Stop Light Control Relay Malfunction

761

762

1. Stop light switch

2. Stop light switch circuit

3. Stop light control relay

4. Stop light control relay circuit

5. Brake booster with master cylinder (Skid control ECU)

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C1439/66 Steering Angle Sensor Initialization Incomplete 752

1. Steering angle sensor

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

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C1440/98 Unusual Bank Angle Detected - Yaw rate and acceleration sensor

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C1443/34 Invalid Data Received from Yaw Rate Sensor 715 Yaw rate and acceleration sensor

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C1445/66 Vehicle Driven with Steering Angle Sensor not Initialized 753

1. Steering angle sensor

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

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U0123/62 Lost Communication with Yaw Rate Sensor Module

731

732

1. CAN communication line (CAN No. 1 bus)

2. Yaw rate and acceleration sensor

3. Brake booster with master cylinder (Skid control ECU)

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U0126/63 Lost Communication with Steering Angle Sensor Module

741

742

1. CAN communication line (CAN No. 1 bus)

2. Steering angle sensor

3. Brake booster with master cylinder (Skid control ECU)

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Electronically Controlled Brake System DTC
DTC Code Detection Item INF Code Trouble Area See page
36 ABS Control System Malfunction - ABS control system

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C1202/68 Master Reservoir Level Malfunction 371

1. Low brake fluid level

2. Brake fluid leaks

3. Brake master cylinder reservoir (Brake fluid level warning switch) internal open circuit

4. Brake master cylinder reservoir (Brake fluid level warning switch) internal short circuit

5. Open in wire harness

6. Short in wire harness

7. Brake disc rotor excessive wear

8. Brake booster with master cylinder (Skid control ECU)

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C1203/95 ECM Communication Circuit Malfunction -

1. The wrong ECU or sensor was installed

2. Brake booster with master cylinder (Skid control ECU)

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C1211/25 SLA Linear Solenoid

21

22

23

24

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1212/26 SLR Linear Solenoid

31

32

33

34

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1214/62 Hydraulic Control System Malfunction

431

432

433

434

435

436

437

438

1. Brake fluid leaks

2. Brake disc rotor excessive wear

3. Brake booster with master cylinder (Brake actuator)

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C1225/31 SA1 Solenoid Circuit

41

42

43

44

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1226/32 SA2 Solenoid Circuit

51

52

53

54

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1227/33 SA3 Solenoid Circuit

61

62

63

64

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1228/34 STR Solenoid Circuit

71

72

73

74

1. Supply voltage reduced

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1242/42 Open in IG1 / IG2 Power Source Circuit

111

112

1. Open or short in IG1 circuit

2. Open or short in IG2 circuit

3. Improperly connected connector, deformation or corrosion of terminals

4. Entry and start system (IG start circuit)

5. Auxiliary battery

6. Hybrid control system (Charging circuit)

7. Brake booster with master cylinder (Skid control ECU)

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C1246/46 Master Cylinder Pressure Sensor Malfunction

201

202

203

204

207

1. Brake pedal stroke sensor

2. Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1247/47 Stroke Sensor Malfunction

211

212

213

214

215

218

219

223

1. Open or short in brake pedal stroke sensor power supply circuit

2. Open or short in wire harness

3. Improperly connected connector, deformation or corrosion of terminals

4. Brake pedal stroke sensor

5. Brake booster with master cylinder (Skid control ECU)

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C1249/49 Open in Stop Light Switch Circuit 231

1. STOP fuse

2. Stop light switch

3. Stop light switch circuit

4. Brake booster with master cylinder (Skid control ECU)

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C1252/52 Brake Booster Pump Motor on Time Abnormally Long 311

1. Short in motor circuit or motor monitor circuit

2. Motor relay stuck

3. Accumulator pressure sensor malfunction in brake actuator

4. Brake booster with master cylinder (Skid control ECU)

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C1253/53 Pump Motor Relay Malfunction

321

322

323

324

325

326

327

328

329

1. Open or short in motor circuit or motor monitor circuit

2. Brake booster with master cylinder (Skid control ECU)

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C1256/56 Accumulator Low Pressure 341

1. Accumulator pressure dropped due to frequent brake pedal operation (not a malfunction)

2. Pump motor malfunction

3. Accumulator deterioration

4. Accumulator pressure sensor

5. Supply voltage reduced

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C1257/57 Power Supply Drive Circuit

361

362

 Brake booster with master cylinder (Skid control ECU)

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C1259/58 HV System Regenerative Malfunction - Power management control ECU

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C1300 Skid Control ECU Malfunction - Brake booster with master cylinder (Skid control ECU)

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C1311/11 Open in Main Relay 1 Circuit 1

1. Open or short in ABS main relay circuit

2. Brake booster with master cylinder (Skid control ECU)

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C1312/12 Short in Main Relay 1 Circuit 2

1. Short in ABS main relay circuit

2. ABS main relay internal stuck

3. Brake booster with master cylinder (Skid control ECU)

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C1345/66 Linear Solenoid Valve Offset Learning Undone - Perform linear valve offset learning and check for DTCs. If no DTCs are output again, the valve is normal.

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C1352/21 FR Solenoid

11

12

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1353/23 RR Solenoid

15

16

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1356/22 FL Solenoid

13

14

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1357/24 RL Solenoid

17

18

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1364/61 Wheel Cylinder Pressure Sensor Malfunction

421

422

423

424

426

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1365/54 Accumulator Pressure Sensor Malfunction

331

332

333

334

 Brake booster with master cylinder (Skid control ECU or brake actuator)

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C1368/67 Linear Solenoid Valve Offset Malfunction -

1. Perform linear valve offset learning and check for DTCs. If no DTCs are output again, the valve is normal.

2. Brake booster with master cylinder (Brake actuator)

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C1391/69 Accumulator Leak Malfunction 351

1. Brake fluid leaks

2. Brake booster with master cylinder (Brake actuator)

(Malfunctioning internal seal, low gas pressure in accumulator, etc.)

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C1392/48 Stroke Sensor Zero Point Calibration Undone -

1. Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete)

2. Brake booster with master cylinder (Skid control ECU)

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C1451/72 Motor Drive Permission Malfunction -

1. Brake fluid leaks

2. Air bleeding not performed

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U0073/94 Control Module Communication Bus OFF

461

462

463

464

465

466

1. CAN communication line (CAN No. 1 bus)

2. Yaw rate and acceleration sensor

3. Steering angle sensor

4. Brake booster with master cylinder (Skid control ECU)

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U0293/59 Communication Error from HV ECU

411

412

413

1. CAN communication line (Power management bus)

2. Power management control ECU

3. Brake booster with master cylinder (Skid control ECU)

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ABS and Electronically Controlled Brake System DTC
DTC Code Detection Item INF Code Trouble Area See page
C1241/41 Low Battery Positive Voltage

101*1

102*1

551*2

552*2

553*2

1. Improperly connected connector, deformation or corrosion of terminals

2. Auxiliary battery

3. Hybrid control system (Charging circuit)

4. Brake booster with master cylinder (Skid control ECU)

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*1: Electronically Controlled Brake System DTC

*2: ABS DTC

ABS Test Mode DTC
DTC Code Detection Item INF Code Trouble Area See page
C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC) -

1. Front speed sensor RH

2. Sensor installation

3. Speed sensor rotor

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C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) -

1. Front speed sensor LH

2. Sensor installation

3. Speed sensor rotor

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C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) -

1. Rear speed sensor RH

2. Sensor installation

3. Speed sensor rotor

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C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) -

1. Rear speed sensor LH

2. Sensor installation

3. Speed sensor rotor

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C1275/75 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) -

1. Front speed sensor RH

2. Speed sensor rotor

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C1276/76 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) -

1. Front speed sensor LH

2. Speed sensor rotor

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C1277/77 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) -

1. Rear speed sensor RH

2. Speed sensor rotor

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C1278/78 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) -

1. Rear speed sensor LH

2. Speed sensor rotor

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C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC) -

1. Sensor installation

2. Yaw rate and acceleration sensor

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C1281/81 Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) -

1. Stop light switch

2. Regulator pressure sensor

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Electronically Controlled Brake System Test Mode DTC
DTC Code Detection Item INF Code Trouble Area See page
C1346/71 Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC) -

1. Brake pedal stroke sensor

2. Brake pedal stroke sensor circuit

Click here