2020 Lexus ES300h Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2020 Lexus ES300h and How to Fix Them

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Reviewed by
Bo Fader
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 2020 Lexus ES300h 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 2020 Lexus ES300h 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 cruise control issue in my 2020 Lexus ES300h?

When diagnosing the cruise control issue in your 2020 Lexus ES300h, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex solutions. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, since malfunctioning buttons can lead to issues. Utilizing an OBD-II scanner to check for error codes is a crucial step, as these codes can reveal underlying problems affecting the cruise control system. Additionally, verify the condition of the speed sensors, which are vital for accurate operation; faulty sensors can significantly impair cruise control performance. Don’t overlook the importance of inspecting the wiring and connections for any signs of damage or corrosion, as these can hinder communication between components. Finally, if all preliminary checks do not resolve the issue, consider testing the cruise control module itself, as it may require diagnosis or replacement. By following this structured approach, you can effectively identify and address the root cause of the cruise control problem in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Lexus ES300h?

When troubleshooting the cruise control system in a 2020 Lexus ES300h, 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 detect the vehicle's speed accurately, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can disrupt the cruise control operation, as the system is designed to disengage when the brake pedal is pressed. Another potential culprit is a malfunctioning throttle actuator, which controls the engine's throttle opening and is crucial for maintaining speed. If the cruise control module itself is defective, it may require replacement or repair to restore functionality. Lastly, electrical problems such as wiring issues or blown fuses can also impede the cruise control system's performance. By identifying and addressing these common issues, you can effectively diagnose and repair the cruise control system in your Lexus ES300h, ensuring a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in my 2020 Lexus ES300h?

Addressing the malfunctioning cruise control in your 2020 Lexus ES300h is of utmost urgency due to the potential safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, significantly increasing the likelihood of accidents. Moreover, neglecting this issue can compromise your vehicle's performance, leading to further damage that may require costly repairs. Timely intervention not only ensures that your vehicle operates as intended but also helps maintain its resale value, as prospective buyers are more likely to be deterred by unresolved issues. Ultimately, resolving the cruise control malfunction promptly provides peace of mind, allowing you to drive confidently, knowing that your vehicle is safe and reliable. Therefore, it is crucial to prioritize this repair to safeguard your driving experience and the integrity of your vehicle.

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