Toyota LTA Malfunction Not Available

Toyota LTA Malfunction

LTA Malfunction is a warning message that comes up on Toyota Rav4, Highlander, and Camry when the (Lane Tracking Assist) stops working and is no longer available. There can several reasons why LTA malfunction comes up on a Toyota but a faulty ABS wheel speed sensor or a weak or dead car battery are two of the most common problems triggering the LTA warning on a Toyota.

LTA Message Meaning

A few common warning messages on Toyota equipped with the LTA system include.

  • LTA MALFUNCTION VISIT YOUR DEALER – this error means a problem with the LTA system. It is essential to check this issue by running a full system scan with the YOUCANIC scanner to find out what is causing the problem. This message is a general warning that the lane tracing assist system is not working correctly. You can contact your dealer to investigate the issue or use the YOUCANIC scanner to troubleshoot the problem yourself.
  • LTA UNAVAILABLE – means that the system has been temporarily disabled due to a malfunction in a sensor other than the front camera. You should turn off the lane assist function and try again later. It is important to address any issues with the lane tracing assist system as soon as possible to ensure it is functioning correctly.
  • LTA UNAVAILABLE AT CURRENT SPEED- if you receive a warning message stating that you are driving too fast to use lane tracing assist, the system is not currently able to function properly at your current speed. To use the lane assist function, you will need to slow down. It is important to follow all relevant speed limits and laws to ensure the safe operation of your vehicle and its systems.

What is Toyota LTA System?

Toyota LTA (Lane Tracing Assist) system uses a front camera to detect white or yellow lane lines while the vehicle is driving. If the system determines that the vehicle may stray from its current lane, it will warn the driver and make slight adjustments to the steering wheel to help keep the vehicle in its lane. While the dynamic radar cruise control with full-speed range is active, the LTA system will use the front camera and radar to detect preceding vehicles and make steering adjustments to maintain the vehicle’s lane position or what is also known as lane centering.

It is important to note that the LTA system is not a replacement for the driver’s attention and responsibility while driving. The LTA system does not take over control of the vehicle or reduce the need for the driver to monitor their surroundings constantly. The driver must always remain alert, in control of the vehicle, and be prepared to make steering adjustments as necessary to ensure safe operation. Do not rely solely on the LTA system to navigate and stay within your lane.

What does Toyota LTA malfunction mean?

Toyota LTA Malfunction Not Available

If you see the message ‘LTA Malfunction Visit Your Dealer,’ it means that the Lane Tracing Assist (LTA) system is not functioning properly. While the LTA is malfunctioning, your Toyota will not center itself autonomously if the car starts to drift from the lane.

You can take the vehicle to the dealer or diagnose it yourself with your YOUCANIC full system scanner. Common causes include faulty ABS wheel speed sensor, steering angle sensor, debris, or dirt on the front camera. If you see the message ‘LTA Unavailable,’ it means that the LTA system has been temporarily disabled due to a malfunction in a sensor other than the front camera.

If driving in snow or slippery roads due to low temperatures, it is recommended to turn off the LTA system using the switch on the dashboard or via the steering wheel controls.

Common Problems

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Several factors can cause a lane-keeping assist (LTA) system to malfunction on a Toyota; some of the most common problems include:

  • Incorrect sensor calibrations
  • ABS, VSC, TRAC, and PCS are not operating.
  • TRAC or VSC is not turned off.
  • The vehicle has a modified suspension or ride height.
  • Lost communication with Trailer Brake Control Module – DTC U01378
  • Light obstructs the view of the front camera.
  • Faulty ABS wheel speed sensor
  • The steering angle sensor needs recalibration or is defective.
  • The road lines are unclear, nonexistent, or consist of non-standard colors.
  • The lane is too narrow or wide.
  • The vehicle was affected by a strong wind.
  • Damage or obstructions to the sensors (such as dirt, snow, or ice)
  • The user has installed an aftermarket grille guard (bull bars, kangaroo bars, etc.).
  • Malfunctioning or damaged components of the LTA system
  • Interference from other electronic systems or devices
  • Incorrect or uneven tire pressure
  • Poor road conditions, such as faded lane lines or construction

There can be a lot of issues that can cause the Toyota LTA system to malfunction. To find out exactly why LTA malfunction is coming on, read the fault codes from all vehicle systems using a full system scanner.


If your Toyota is showing an LTA malfunction on the dashboard, you will need to perform a full system scan to find out what is causing the issue. Sometimes, the problem is simple, like a faulty ABS wheel speed sensor or resetting the steering angle sensor. While in more extreme cases, you may need to reflash the forward recognition camera and radar sensors which will need to be completed by a Toyota dealer.

Use the YOUCANIC scanner to perform a Health Check on the vehicle and clear any STORED or fault codes with a HISTORY state. After that, focus on resolving any fault codes with a CURRENT status. The LTA malfunction rarely comes up by itself. You will often get several other warning messages, such as Pre-Collision malfunction or ABS malfunction, traction control unavailable, and more. This often means that one issue or failed sensor is causing problems for several vehicle systems. Once you run a full system scan, you should have a better idea of what is going on with the vehicle.


  • Rushit Hila • ASE Certified

    Rushit Hila, an ASE-certified engineer (G1 Automotive Maintenance and Repair), brings over two decades of hands-on experience in the automotive world to his writing. With a strong educational background, including a Master of Science in Engineering and a Bachelor of Science in Engineering, he has honed his skills and expertise through years of practical work. As a respected authority in the field, Mr. Hila is dedicated to offering insightful and valuable content that resonates with both vehicle owners and mechanics.

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