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 NX 300h BaseFACTORY OEM SERVICE PROCEDURE
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION[10/2014 - 09/2017]
| 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 |
| C1A51 | Electric Parking Brake System Malfunction |
| C1A52 | Driving Support ECU Communication Abnormal |
| 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 Hybrid Vehicle Control System |
| U1104 | Lost Communication with Driving Support ECU |
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2017 - 05/2019]
| 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 |
| C1A4A | Skid Control Buzzer Circuit |
| C1A52 | Driving Support ECU Communication Abnormal |
| P0571 | Brake Switch "A" Circuit |
| P0575 | Cruise Control Input Circuit |
| P1578 | Brake System |
| P1630 | Communication Error from VSC to HV ECU |
| P1631 | Communication Error from HV ECU to VSC |
| U0104 | Lost Communication with Cruise Control Module |
| U0122 | Lost Communication With Vehicle Dynamics Control Module |
| 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 |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U1104 | Lost Communication with Driving Support ECU |
| U1104 | Lost Communication with Driving Support ECU |
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [05/2019 - ]
| DTC Code | Description |
|---|---|
| P0571 | Stop Light Switch Circuit |
| P0575 | Cruise Control Input Circuit |
| P1578 | Brake System |
| P1630 | Communication Error from VSC to HV ECU |
| P1631 | Communication Error from HV ECU to VSC |
| U0104 | Lost Communication with Cruise Control Module |
| U0122 | Lost Communication with Vehicle Dynamics Control Module |
| U012587 | Lost Communication with Multi-axis Acceleration Sensor Module Missing Message |
| U012687 | Lost Communication with Steering Angle Sensor Module Missing Message |
| U012987 | Lost Communication with Brake System Control Module Missing Message |
| U015587 | Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message |
| U023587 | Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
| U029387 | Lost Communication with Hybrid Powertrain Control Module Missing Message |
| U030051 | Internal Control Module Software Incompatibility Not Programmed |
| U030057 | Internal Control Module Software Incompatibility Invalid/Incompatible Software Component |
| U031851 | Software Incompatibility with Brake System Control Module Not Programmed |
| U031857 | Software Incompatibility with Brake System Control Module Invalid/Incompatible Software Component |
| U032251 | Software Incompatibility with Body Control Module Not Programmed |
| U032257 | Software Incompatibility with Body Control Module Invalid/Incompatible Software Component |
| U059481 | Invalid Data Received from Hybrid Powertrain Control Module Invalid Serial Data Received |
| U110687 | Lost Communication with Electric Parking Brake Module Missing Message |
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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