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 RX 350 Base, FWDFACTORY OEM SERVICE PROCEDURE
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [09/2015 - 08/2019]
| 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 |
| P057113 | Brake Switch "A" Circuit Open |
| P057162 | Brake Switch "A" Signal Compare Failure |
| P057504 | Cruise Control System Internal Failure |
| P057549 | Cruise Control Internal Electronic Failure |
| P157800 | Brake System |
| P160700 | Cruise Control Input Processor |
| P163081 | Communication Error from VSC to ECM Invalid Serial Data Received |
| P163181 | Communication Error from ECM to VSC Invalid Serial Data Received |
| U0100 | Lost Communication with ECM / PCM "A" |
| U010087 | Lost Communication With ECM/PCM "A" Missing Message |
| U012287 | Lost Communication with Vehicle Dynamics Control Module Missing Message |
| 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 |
| U1104 | Lost Communication with Driving Support ECU |
| U110487 | Lost Communication with Driving Support ECU Missing Message |
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - [08/2019 - ]
| DTC Code | Description |
|---|---|
| P057113 | Brake Switch "A" Circuit Open |
| P057162 | Brake Switch "A" Signal Compare Failure |
| P057504 | Cruise Control System Internal Failure |
| P057549 | Cruise Control Internal Electronic Failure |
| P157800 | Brake System |
| P160700 | Cruise Control Input Processor |
| P163081 | Communication Error from VSC to ECM Invalid Serial Data Received |
| P163181 | Communication Error from ECM to VSC Invalid Serial Data Received |
| U010087 | Lost Communication with ECM/PCM "A" Missing Message |
| U010087 | Lost Communication with ECM/PCM "A" Missing Message |
| U010487 | Lost Communication with Cruise Control Module Missing Message |
| U012287 | Lost Communication with Vehicle Dynamics Control Module Missing Message |
| 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 |
| 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 |
| U040181 | Invalid Data Received from ECM/PCM "A" Invalid Serial Data Received |
| U110687 | Lost Communication with Electric Parking Brake Module Missing Message |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.