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.
2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A01 | Driving Support ECU |
| C1A02 | Vehicle Information Not Obtained |
| C1A03 | Driving Support ECU Internal Logical Error |
| C1A05 | Stop Light Switch Circuit |
| C1A06 | Stop Light Switch Input Circuit |
| C1A0A | Front Radar Sensor Region Code Mismatch |
| C1A0C | Object Recognition Camera Region Code Mismatch |
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| C1A20 | Object Recognition ECU |
| C1A22 | Object Recognition Camera Incorrect Axial Gap |
| C1A23 | Object Recognition Camera Initialization Incomplete |
| C1A40 | ENG / EHV Device |
| C1A41 | Brake Request Value Mismatch between ENG / EHV and Driving Support ECU |
| C1A4A | Skid Control Buzzer Circuit |
| C1A4B | Stop Light Relay Circuit |
| C1A50 | Brake System |
| P1615 | Communication Error from Distance Control ECU to HV ECU |
| U0122 | Lost Communication with Vehicle Dynamics Control Module |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U0293 | Lost Communication with HV ECU |
| U1104 | Lost Communication with Driving Support ECU |
| U1119 | Lost Communication with Object Recognition ECU (CAN) |
Factory Service Tools
Use the Manual With the Right Hardware
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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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