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Engine-Codes – Generic – U0124

U0124 Code - Lost Communication with Lateral Acceleration Sensor Module

Quick Answer

The U0124 code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the lateral acceleration sensor module. Common causes include Faulty lateral acceleration sensor module, Wiring or connection issues between the ECM and lateral acceleration sensor module, Corrosion or damage to the sensor module connectors. 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 indicates Lost Communication with Lateral Acceleration Sensor Module.
Common causes
Common causes include Faulty lateral acceleration sensor module, Wiring or connection issues between the ECM and lateral acceleration sensor module, Corrosion or damage to the sensor module connectors.
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 05, 2024
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Code U0124 Description

The U0124 code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the lateral acceleration sensor module. The lateral acceleration sensor measures the vehicle's side-to-side movement, providing important data for stability control systems. When communication is lost with this sensor module, it can lead to issues with the vehicle's stability control, traction control, and potentially affect the overall handling and safety of the vehicle.

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

Common Causes of U0124

  1. Faulty lateral acceleration sensor module.
  2. Wiring or connection issues between the ECM and lateral acceleration sensor module.
  3. Corrosion or damage to the sensor module connectors.
  4. ECM software or hardware issues.
  5. Electrical interference or signal disruption.

Symptoms of U0124

  1. Illumination of the traction control or stability control warning light on the dashboard.
  2. Reduced traction control or stability control performance.
  3. Unpredictable handling or steering behavior.
  4. Harsh shifting from the transmission.
  5. Loss of power or acceleration.

How to Fix U0124

  1. Begin by performing a visual inspection of the wiring and connectors between the ECM and lateral acceleration sensor module. Repair or replace any damaged wiring or connectors.
  2. Use a diagnostic scan tool to check for any stored trouble codes in the ECM and lateral acceleration sensor module. Clear the codes and retest the vehicle.
  3. If the issue persists, test the lateral acceleration sensor module itself for proper operation. Replace the sensor module if necessary.
  4. Check the ECM for any software updates or reprogramming that may be required to improve communication with the sensor module.
  5. After completing the repairs, perform a test drive to ensure that the traction control and stability control systems are functioning correctly.

Cost to Fix U0124

The cost of repairing a lost communication issue with the lateral acceleration sensor module can vary depending on the specific cause of the problem. In general, the cost of replacing the lateral acceleration sensor module can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or ECM reprogramming are necessary. It's recommended to consult with a qualified mechanic or dealership for a more precise estimate based on the vehicle's make and model. Labor rates at auto repair shops typically range from $80 to $150 per hour.

What does this mean?

Tech Notes for U0124

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.

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Code U0124 Information for Specific Makes

  • U0124 Lexus — Lost Communication with Lateral Acceleration Sensor Module
  • U0124 Toyota — Lost Communication with Lateral Acceleration Sensor Module
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.

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