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 Plug-inFACTORY 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 |
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| 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 |
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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