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
Lane-Keeping Assist System
LANE-KEEPING ASSIST SYSTEM DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A01 | Driving Support ECU |
| C1A02 | Vehicle Information Not Obtained |
| C1A05 | Stop Light Switch Circuit |
| C1A06 | Stop Light Switch Input Circuit |
| C1A0C | Object Recognition Camera Region Code Mismatch |
| C1A20 | Object Recognition ECU |
| C1A22 | Object Recognition Camera Incorrect Axial Gap |
| C1A23 | Object Recognition Camera Initialization Incomplete |
| C1A45 | Vehicle Speed Sensor |
| C1A46 | Yaw Rate Sensor |
| C1A4A | Skid Control Buzzer Circuit |
| C1A70 | Power Steering Control System |
| C1A71 | Power Steering Control Torque |
| U0122 | Lost Communication with Vehicle Dynamics Control Module |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0131 | Lost Communication with Power Steering Control Module |
| 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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