2021 Lexus LX570 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Lexus LX570

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2021 Lexus LX570 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2021 Lexus LX570 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What steps should I take to diagnose the non-functioning cruise control in my 2021 Lexus LX570?

When diagnosing the non-functioning cruise control in your 2021 Lexus LX570, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily rectifiable problem. Next, examine the cruise control buttons on your steering wheel for any signs of damage or obstruction, as these can hinder the system's engagement. Following this, verify the functionality of the speed sensor, which is critical for cruise control operation; any malfunction here can disrupt the system. Additionally, check the brake pedal switch, as a faulty switch may inadvertently disengage the cruise control when the brakes are applied. If these initial checks do not reveal the issue, utilize an OBD-II scanner to identify any error codes that could indicate specific problems within the cruise control system. Should these steps fail to resolve the issue, consulting a professional mechanic or visiting a dealership for a comprehensive inspection is advisable to ensure your vehicle is properly diagnosed and repaired. This methodical approach not only saves time but also enhances the likelihood of identifying the root cause of the cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2021 Lexus LX570?

When troubleshooting the cruise control system in a 2021 Lexus LX570, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can hinder the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can disrupt cruise control functionality, as the system is designed to disengage when the brake pedal is pressed. Another potential culprit is a malfunction in the throttle control system, which may involve a faulty throttle position sensor or actuator, affecting the system's speed maintenance capabilities. Electrical issues, such as blown fuses or wiring problems, can also impede the cruise control's operation, as can vacuum leaks that result in a loss of pressure within the system. By identifying and addressing these common issues, you can effectively restore the cruise control functionality in your Lexus LX570.

How urgent is it to address the malfunctioning cruise control in a 2021 Lexus LX570?

When it comes to the malfunctioning cruise control in a 2021 Lexus LX570, the urgency of addressing the issue cannot be overstated. Cruise control is designed to enhance driving comfort by maintaining a consistent speed, especially during long journeys. However, if this system fails, it can lead to erratic vehicle behavior, such as sudden acceleration or deceleration, which poses significant safety risks not only to the driver but also to passengers and other road users. Ignoring these symptoms can result in dangerous driving conditions and may even lead to accidents. Furthermore, a malfunctioning cruise control can detract from the overall driving experience, making it less enjoyable and more stressful. Therefore, it is crucial for DIY enthusiasts to prioritize the repair of this system to ensure both safety and optimal vehicle performance. Taking prompt action can prevent further complications and contribute to a safer driving environment.

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2021 Lexus LX570 Cruise Control Issues & Repair Guide