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.
2021 Toyota Prius LE AWD-eFACTORY OEM SERVICE PROCEDURE
Forward Recognition Camera System
FORWARD RECOGNITION CAMERA SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2015 - 12/2018]
| DTC Code | Description |
|---|---|
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| C1AA0 | Front Camera Module Circuit |
| C1AA1 | FCM Destination Information Unmatched |
| C1AA3 | Vehicle Speed Sensor Circuit |
| C1AA4 | Yaw Rate Sensor Circuit |
| C1AA5 | Yaw Rate Sensor Power Supply Voltage Circuit |
| C1AA6 | Yaw Rate Sensor Zero Point Malfunction |
| C1AA9 | Front Camera Module Beam Axis Not Adjusted |
| C1AAA | FCM Destination Information Uninitialized |
| C1AAE | Heater Circuit |
| U0101 | Lost Communication with TCM |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0142 | Lost Communication with Body Control Module "B" |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U0293 | Lost Communication with HV ECU |
| U1104 | Lost Communication with Driving Support ECU |
FORWARD RECOGNITION CAMERA SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2018 - 07/2020]
| DTC Code | Description |
|---|---|
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| C1AA0 | Front Camera Module Circuit |
| C1AA1 | FCM Destination Information Unmatched |
| C1AA3 | Vehicle Speed Sensor Circuit |
| C1AA4 | Yaw Rate Sensor Circuit |
| C1AA5 | Yaw Rate Sensor Power Supply Voltage Circuit |
| C1AA6 | Yaw Rate Sensor Zero Point Malfunction |
| C1AA9 | Front Camera Module Beam Axis Not Adjusted |
| C1AAA | FCM Destination Information Uninitialized |
| C1AAE | Heater Circuit |
| U0101 | Lost Communication with TCM |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0142 | Lost Communication with Body Control Module "B" |
| 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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