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 Lexus GX 460 BaseFACTORY OEM SERVICE PROCEDURE
Pre-Collision System
PRE-COLLISION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A01 | Driving Support ECU |
| C1A02 | Vehicle Information Not Obtained |
| 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 |
| C1A46 | Yaw Rate Sensor |
| C1A47 | Steering Angle Sensor |
| C1A4A | Skid Control Buzzer Circuit |
| C1A4B | Stop Light Relay Circuit |
| C1A50 | Brake System Malfunction |
| C1A63 | Other System Malfunction |
| C1A64 | Brake Control Signal Mismatch |
| C1AA0 | Front Camera Module Circuit |
| C1AA8 | Front Camera Module Incorrect Axial Gap |
| C1AA9 | Front Camera Module Beam Axis Not Adjusted |
| C1AAE | Heater Circuit |
| U0100 | Lost Communication with ECM / PCM "A" |
| U0125 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U023A | Lost Communication with Front Camera Module |
| U1002 | Lost Communication with Gateway Module |
| U1104 | Lost Communication with Driving Support ECU |
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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