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 MANUALSTOYOTA2019PRIUS C LREPAIR AND DIAGNOSISRESTRAINTSRESTRAINTS CONTROL SYSTEMSPRE-COLLISION SYSTEM - DIAGNOSTIC CODES & CIRCUIT TESTS
2019 Toyota Prius C L
Pre-Collision System - Diagnostic Codes & Circuit Tests
2019 Toyota Prius C LSECTION Pre-Collision System - Diagnostic Codes & Circuit Tests
- Pre-Collision System
- DTC C1AA3: Vehicle Speed Sensor Circuit [11/2015 - ]
- DTC C1AA4: Yaw Rate Sensor Circuit; DTC C1AA5: Yaw Rate Sensor Power Supply Voltage Circuit [11/2015 - ]
- DTC C1AA7: Skid Control Buzzer Circuit [11/2015 - 06/2017]
- DTC C1AA8: Front Camera Module Incorrect Axial Gap; DTC C1AA9: Front Camera Module Beam Axis Not Adjusted [11/2015 - ]
- DTC C1AAA: FCM Destination Information Uninitialized [11/2015 - ]
- DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U023A: Lost Communication with Front Camera Module; DTC U0293: Lost Communication with Hybrid Control Module [11/2015 - ]
- DTC C1A47: Steering Angle Sensor [11/2015 - ]
- DTC C1A48: G Sensor [11/2015 - ]
- DTC C1A4B: Stop Light Relay Circuit [11/2015 - ]
- DTC C1A50: Brake System Malfunction [11/2015 - ]
- DTC C1A62: Brake Control Signal Malfunction [11/2015 - ]
- DTC C1AA0: Front Camera Module Circuit [11/2015 - 06/2017]
- DTC C1A63: Other System Malfunction [11/2015 - ]
- DTC C1AAF: Heater Activation Relay Open [06/2017 - ]
- DTC C1AA0: Front Camera Module Circuit [06/2017 - ]
- Circuit Tests
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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.