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 MANUALSTOYOTA2012PRIUS THREEREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLELECTRONICALLY CONTROLLED BRAKE SYSTEM (EXCEPT PLUG-IN) (DIAGNOSTIC CODES & SYMPTOM TESTS)
2012 Toyota Prius Three
Electronically Controlled Brake System (Except Plug-In) (Diagnostic Codes & Symptom Tests)
2012 Toyota Prius ThreeSECTION Electronically Controlled Brake System (Except Plug-In) (Diagnostic Codes & Symptom Tests)
- Electronically Controlled Brake System
- DTC 36: ABS Control System Malfunction; DTC 43: ABS Control System Malfunction
- DTC 42: Electronically Controlled Brake System Malfunction; DTC 45: Electronically Controlled Brake System Malfunction
- DTC C1202/68: Master Reservoir Level Malfunction
- DTC C1203/95: ECM Communication Circuit Malfunction
- DTC C1210/36: Zero Point Calibration of Yaw Rate Sensor Undone; DTC C1336/98: Zero Point Calibration of Acceleration Sensor Undone
- DTC C1211/25: SLA Linear Solenoid; DTC C1212/26: SLR Linear Solenoid; DTC C1225/31: SA1 Solenoid Circuit; DTC C1226/32: SA2 Solenoid Circuit; DTC C1227/33: SA3 Solenoid Circuit; DTC C1228/34: STR Solenoid Circuit; DTC C1352/21: FR Solenoid; DTC C1353/23: RR Solenoid; DTC C1356/22: FL Solenoid; DTC C1357/24: RL Solenoid
- DTC C1214/62: Hydraulic Control System Malfunction
- DTC C1231/31: Steering Angle Sensor Circuit Malfunction
- DTC C1234/34: Yaw Rate Sensor Malfunction; DTC C1243/43: Acceleration Sensor Stuck Malfunction; DTC C1244/44: Open or Short in Acceleration Sensor Circuit; DTC C1245/45: Acceleration Sensor Output Malfunction; DTC C1279/79: Acceleration Sensor Output Voltage Malfunction (Test Mode DTC); DTC C1381/97: Acceleration Sensor Power Supply Voltage Malfunction
- DTC C1235/35: Foreign Object is Attached on Tip of Front Speed Sensor RH; DTC C1236/36: Foreign Object is Attached on Tip of Front Speed Sensor LH; DTC C1238/38: Foreign Object is Attached on Tip of Rear Speed Sensor RH; DTC C1239/39: Foreign Object is Attached on Tip of Rear Speed Sensor LH; DTC C1275/75: Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1276/76: Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1277/77: Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1278/78: Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
- DTC C1241/41: Low Battery Positive Voltage; DTC C1242/42: Open in IG1 / IG2 Power Source Circuit
- DTC C1246/46: Master Cylinder Pressure Sensor Malfunction; DTC C1281/81: Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC); DTC C1364/61: Wheel Cylinder Pressure Sensor Malfunction
- DTC C1247/47: Stroke Sensor Malfunction; DTC C1346/71: Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC); DTC C1392/48: Stroke Sensor Zero Point Calibration Undone
- DTC C1249/49: Open in Stop Light Switch Circuit
- DTC C1252/52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253/53: Pump Motor Relay Malfunction
- DTC C1256/56: Accumulator Low Pressure
- DTC C1257/57: Power Supply Drive Circuit
- DTC C1259/58: HV System Regenerative Malfunction; DTC C1310/51: Malfunction in HV system
- DTC C1271/71: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1464/31: Front Speed Sensor RH Circuit; DTC C1465/32: Front Speed Sensor LH Circuit
- DTC C1273/73: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274/74: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466/33: Rear Speed Sensor RH Circuit; DTC C1467/34: Rear Speed Sensor LH Circuit
- DTC C1290/66: Steering Angle Sensor Zero Point Malfunction
- DTC C1300: Skid Control ECU Malfunction
- DTC C1311/11: Open in Main Relay 1 Circuit; DTC C1312/12: Short in Main Relay 1 Circuit
- DTC C1345/66: Linear Solenoid Valve Offset Learning Undone; DTC C1368/67: Linear Solenoid Valve Offset Malfunction
- DTC C1365/54: Accumulator Pressure Sensor Malfunction
- DTC C1380/64: Stop Light Control Relay Malfunction
- DTC C1391/69: Accumulator Leak Malfunction
- DTC C1439/66: Steering Angle Sensor Initialization Incomplete; DTC C1445/66: Vehicle Driven with Steering Angle Sensor not Initialized
- DTC C1440/98: Unusual Bank Angle Detected
- DTC C1442/44: Invalid Data Received from Acceleration Sensor; DTC C1443/34: Invalid Data Received from Yaw Rate Sensor
- DTC C1451/72: Motor Drive Permission Malfunction
- DTC U0073/94: Control Module Communication Bus OFF; DTC U0123/62: Lost Communication with Yaw Rate Sensor Module; DTC U0124/95: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126/63: Lost Communication with Steering Angle Sensor Module; DTC U0293/59: Communication Error from HV ECU
- Symptom Tests
- Circuit Tests
RENDER: 1.0x
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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.