Toyota LTA Malfunction: What You Need to Know

Have you encountered a Toyota Lane Tracing Assist (LTA) malfunction? You’re not alone, as some Toyota owners have reported similar issues that may be affecting their vehicle’s safety features.

In this article, we’ll explore the causes and fixes for such malfunctions, providing you with valuable insights to address and prevent any potential problems.

Understanding the LTA system and its potential issues is crucial for maintaining the effectiveness of your car’s safety features and ensuring a smooth driving experience.

What is Toyota LTA System

The Toyota LTA (Lane Tracing Assist) system is a feature designed to provide a safer and more comfortable driving experience. This system is part of Toyota Safety Sense (TSS), which is a suite of advanced driver assistance technologies.

When activated, the LTA system monitors the road markings and helps you stay centered in your lane. If your vehicle starts to drift out of its lane, LTA gently corrects your steering to keep you in the center of the lane. This is especially useful during long drives or when you’re juggling multiple tasks while on the road.

To turn on or off the Toyota LTA system, you can typically find the activation button on the vehicle’s steering wheel or within its settings menu. It’s essential to familiarize yourself with its features before using them, as the system may have limitations or perform differently under certain conditions. You can find more detailed information on turning the LTA system on and off in Toyota’s Quick Reference Guide video.

Remember, the LTA system is designed as a support function and should not be solely relied upon to stay within your lane. Always maintain full control over your vehicle and keep your attention on the road.

Symptoms of LTA Malfunction

Lane Trace Assist Issues

If you’re experiencing LTA malfunction in your Toyota, you might notice issues with the Lane Trace Assist system. Your vehicle may not be able to detect lane markings properly or may fail to keep your vehicle centered within the lanes. This can make it difficult to maintain safe driving on the road.

Radar Sensor Issues

Another sign of LTA malfunction can be problems with the radar sensor. Your vehicle may not accurately sense the distance and speed of other vehicles around you, which is crucial for maintaining a safe following distance. If you find that your vehicle is not responding appropriately to the vehicles in front of you, this could be an indication of a radar sensor issue.

MID Display Warnings

You might also see warning messages on your Multi-Information Display (MID). For example, some 2022 model year Toyota Tundra SR grade vehicles may display a warning message “LTA Malfunction – Visit Your Dealer” and Diagnostic Trouble Code (DTC) U013787- “Lost Communication with Trailer Brake Control Module Missing Message”. These warning messages are an important indication that you should consult a professional to diagnose and fix the problem with your vehicle’s LTA system.

Effect on Lane Centering

LTA malfunction can impact your Toyota’s lane centering capabilities. When the Lane Tracing Assist system is not functioning properly, it may not guide your vehicle correctly between lane lines during your journeys. This could lead to a less comfortable and less safe driving experience.

Maintaining proper lane centering is important for your safety and that of other road users. When LTA malfunctions, it might be caused by several factors, such as a faulty ABS wheel speed sensor or a weak or dead car battery. Being aware of these common issues allows you to troubleshoot effectively and get the LTA system working again in your Toyota.

It’s crucial to monitor your vehicle’s LTA performance and pay attention to any warnings or alerts that your vehicle might display. If you notice any irregularities or difficulties with lane centering, it’s a good idea to have your Toyota vehicle checked by a professional mechanic to address the underlying problem causing the LTA malfunction.

Windshield Impact on LTA Malfunction

Your Toyota’s Lane Tracing Assist (LTA) system relies on cameras and sensors to monitor the road conditions and keep your vehicle in the center of the lane. The performance of the LTA system can be affected by the condition of your windshield.

If your windshield is dirty or obstructed in any way, it may cause the LTA system to malfunction. For example, dirt, snow, or ice on the camera lens can prevent it from gathering accurate data. To prevent this, ensure that your windshield is clean and free of debris or obstructions.

Another factor affecting your LTA system’s performance could be the condition of the windshield itself. If there are cracks, chips, or other damage on the surface, they might interfere with the system’s ability to properly function. In such cases, it’s important to get your windshield repaired or replaced as necessary.

Lastly, if your Toyota LTA system is still malfunctioning despite having a clean and undamaged windshield, there might be other causes, such as malfunctioning components, interference from other electronic systems, or poor road conditions. In these situations, consulting your Toyota dealership or a qualified mechanic for further diagnosis would be beneficial.

How to Fix Toyota LTA Malfunction

When you encounter an LTA malfunction in your Toyota vehicle, it’s essential to identify and fix the issue as soon as possible. This section will guide you through some diagnostic steps and troubleshooting tips to help get your Lane Tracing Assist system back up and running.

Diagnostic Steps

Before jumping to conclusions, it’s crucial to gather more information about the malfunction. Implement the following diagnostic steps:

  1. Read error codes: Use a diagnostic tool to read any stored DTCs related to LTA malfunction, such as DTC U013787. Error codes provide valuable information about the specific issue affecting your system.
  2. Perform a Health Check: If you have access to Toyota Techstream, perform a Health Check to gather more detailed information about your vehicle’s systems.
  3. Test drive: Look for any obvious signs of poor LTA performance during a test drive, such as your vehicle not following clearly marked lanes.

Once you’ve collected relevant information about the LTA malfunction, it’s time to identify the root cause and implement necessary fixes.

Troubleshooting Tips

Consider the following troubleshooting tips to help fix common issues related to LTA malfunctions:

  1. Recalibrate the camera: Ensure that your vehicle’s front camera is calibrated correctly. If LTA performance seems off even on clearly marked lanes, ask your dealership to recalibrate the camera.
  2. Check the sensor: Ensure that the sensors responsible for LTA are clean and free of any obstructions. Any dirt, snow, or ice can hinder the system’s performance.
  3. Ensure ideal conditions: LTA functions optimally under ideal conditions, which include clear lane markings, good weather, and daylight driving. If your LTA system malfunctions under such conditions, it’s time to consult a professional mechanic or your local dealership.

If you’ve tried these troubleshooting tips, and the problem persists, it’s recommended to visit your local dealership for further analysis and repairs, as doing so may prevent more severe issues in the long run.


In conclusion, Toyota LTA malfunctions can be caused by various factors such as a faulty ABS wheel speed sensor, steering angle sensor, or debris on the front camera. To resolve any issues, diagnose the problem using a reliable diagnostic tool, or visit your dealer for assistance.

  • Eric Williams

    I'm the founder of Daily Car Tips. I wrote articles in the automotive industry for more than 10 years, published in USA and Europe. I love sharing my knowledge and insights with fellow enthusiasts. Join me on this journey as we explore the exciting world of cars together!

    View all posts