AutoCodes – Lexus – U0124 Lexus

U0124 Lexus Code - Lost Communication with Lateral Acceleration Sensor Module

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Lateral Acceleration Sensor Module, Lateral Acceleration Sensor Module harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0124 Lexus indicates Lost Communication with Lateral Acceleration Sensor Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Lateral Acceleration Sensor Module, Lateral Acceleration Sensor Module harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,009

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0124 Lexus Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Lateral Acceleration Sensor Module has not been received.

OBDII Code U0124 Lexus - Lost Communication with Lateral Acceleration Sensor Module - AutoCodes.com — U0124 Lexus Code - Lost Communication with Lateral Acceleration Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0124 Lexus?

Faulty Controller Area Network (CAN) Communication System
Faulty Lateral Acceleration Sensor Module
Lateral Acceleration Sensor Module harness is open or shorted
Lateral Acceleration Sensor Module circuit poor electrical connection

How to Fix the DTC U0124 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0124 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0124 Lexus Code

1. What are the common symptoms of OBDII code U0124 in a Lexus related to Lost Communication with Lateral Acceleration Sensor Module?

- Common symptoms include the ABS warning light, traction control light, or stability control light illuminating on the dashboard. The vehicle may also experience issues with the ABS system or stability control system.

2. What are the possible causes of the OBDII code U0124 in a Lexus?

- Possible causes include a malfunctioning lateral acceleration sensor module, damaged wiring or connectors leading to the sensor, or communication issues within the vehicle's network.

3. How can I diagnose the issue causing the OBDII code U0124 in my Lexus?

- Diagnosing the issue may involve using a diagnostic scanner to retrieve the specific trouble codes, checking the lateral acceleration sensor module for proper functionality, inspecting wiring and connectors for damage, and testing communication between modules.

4. Can I continue driving my Lexus with the U0124 code related to Lost Communication with Lateral Acceleration Sensor Module?

- It is not recommended to drive the vehicle with this code present, as it can affect the operation of important safety systems like ABS and stability control. It is advised to address the issue promptly.

5. How can I repair the U0124 code in my Lexus caused by Lost Communication with Lateral Acceleration Sensor Module?

- Repair options may include replacing the lateral acceleration sensor module, repairing or replacing damaged wiring and connectors, resetting the codes, or reprogramming the affected modules.

6. Will resetting the trouble codes make the U0124 code related to Lost Communication with Lateral Acceleration Sensor Module disappear permanently?

- Resetting the codes may temporarily clear the warning lights, but if the underlying issue causing the code is not resolved, the code is likely to reappear once the system detects the problem again.

7. Is the U0124 code in a Lexus related to Lost Communication with Lateral Acceleration Sensor Module a common issue?

- While it may not be as common as some other OBDII codes, issues with communication or malfunction of the lateral acceleration sensor module can occur in Lexus vehicles, particularly in older models or those with high mileage.

8. Can a DIY enthusiast repair the U0124 code in a Lexus or is it best left to professionals?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue causing the U0124 code. However, due to the complexity of electronic systems in modern vehicles, it is often recommended to seek professional help for accurate diagnosis and repair.

9. Are there any preventive maintenance tips to avoid encountering the U0124 code in a Lexus?

- Regular inspection of the vehicle's sensors, wiring, and connectors can help prevent issues like the U0124 code. Keeping up with scheduled maintenance and addressing any warning lights promptly can also help prevent more serious problems.

10. How long does it typically take to repair the U0124 code related to Lost Communication with Lateral Acceleration Sensor Module in a Lexus?

- The repair time can vary depending on the exact cause of the issue. Simple repairs like replacing a sensor or connector may take a few hours, while more complex issues requiring module reprogramming or extensive wiring repair could take longer and may require professional expertise.