Engine-Codes.com
Engine-Codes – Toyota – U0124 Toyota

U0124 Toyota Code - Lost Communication with Lateral Acceleration Sensor Module

Quick Answer

The U0124 diagnostic trouble code (DTC) for Toyota vehicles indicates that there is a communication failure between the engine control module (ECM) and the lateral acceleration sensor module. Common causes include Faulty Lateral Acceleration Sensor Module: The most common cause of the U0124 code is a malfunctioning lateral acceleration sensor module, Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and lateral acceleration sensor module can disrupt communication and trigger the code, ECM Malfunction: A malfunctioning ECM can also cause communication failures with the lateral acceleration sensor module. 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 Toyota indicates Lost Communication with Lateral Acceleration Sensor Module.
Common causes
Common causes include Faulty Lateral Acceleration Sensor Module: The most common cause of the U0124 code is a malfunctioning lateral acceleration sensor module, Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and lateral acceleration sensor module can disrupt communication and trigger the code, ECM Malfunction: A malfunctioning ECM can also cause communication failures with the lateral acceleration sensor module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0124 Toyota Description

The U0124 diagnostic trouble code (DTC) for Toyota vehicles indicates that there is a communication failure between the engine control module (ECM) and the lateral acceleration sensor module. The lateral acceleration sensor is a crucial component in the vehicle's stability control system, responsible for detecting the vehicle's lateral forces during cornering and making adjustments to ensure optimal stability and handling. When communication with this sensor is lost, it can affect the vehicle's ability to accurately control its stability, potentially leading to unsafe driving conditions.

OBDII Code U0124 Toyota - Lost Communication with Lateral Acceleration Sensor Module
U0124 Toyota Code - Lost Communication with Lateral Acceleration Sensor Module

Common Causes of U0124 Toyota

  1. Faulty Lateral Acceleration Sensor Module: The most common cause of the U0124 code is a malfunctioning lateral acceleration sensor module.
  2. Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and lateral acceleration sensor module can disrupt communication and trigger the code.
  3. ECM Malfunction: A malfunctioning ECM can also cause communication failures with the lateral acceleration sensor module.
  4. CAN Bus Communication Issues: Problems with the CAN bus system, such as shorts or open circuits, can prevent proper communication between the ECM and sensor module.

Symptoms of U0124 Toyota

  1. Illuminated Check Engine Light: The most common symptom associated with the U0124 code is the illumination of the check engine light on the dashboard.
  2. Stability Control Issues: Loss of communication with the lateral acceleration sensor module can result in erratic behavior of the vehicle's stability control system, leading to potential loss of control during cornering.
  3. Poor Handling: The vehicle may exhibit poor handling characteristics, especially during sharp turns or maneuvers.
  4. Reduced Traction Control: The traction control system may be affected, leading to reduced traction and stability on slippery or uneven road surfaces.

How to Fix U0124 Toyota

  1. Diagnose the Issue: Begin by using a diagnostic scan tool to retrieve the specific trouble code and identify the source of the communication failure.
  2. Inspect Wiring Connections: Check the wiring harness between the ECM and lateral acceleration sensor module for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  3. Test the Lateral Acceleration Sensor Module: Test the lateral acceleration sensor module to ensure it is functioning correctly. Replace the sensor if it is found to be faulty.
  4. Check the ECM: If all wiring connections are intact and the sensor module is functioning properly, inspect the ECM for any signs of malfunction. Replace the ECM if necessary.
  5. Clear the Code: Once the repairs are complete, clear the U0124 code from the ECM's memory using a diagnostic scan tool.

Cost to Fix U0124 Toyota

The cost of repairing a U0124 code in a Toyota vehicle can vary depending on the specific cause of the issue. In general, the cost of replacing a lateral acceleration sensor module can range from $200 to $500, including parts and labor. If wiring repairs or ECM replacement is required, the total repair cost may increase accordingly. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It is recommended to consult with a professional mechanic for a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for U0124 Toyota

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.

Need more information about the U0124 Toyota code?

Need more information on how to fix the U0124 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0124 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 Toyota Code

No Frequently Asked Questions about U0124 Toyota Code found.

Discuss the causes and fixes for U0124 Toyota OBDII Code

Submit a New Comment

Code U0124 Toyota comments

No comments found for this page.