2020 Lexus LS500h Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2020 Lexus LS500h

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Reviewed by
Devin Cabugcal
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 LS500h 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 LS500h 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.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2020 Lexus LS500h?

When faced with a non-functioning cruise control in your 2020 Lexus LS500h, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse; a blown fuse can often be the simplest explanation for the issue. Next, ensure that the cruise control settings are correctly configured according to your vehicle's manual, as incorrect settings can prevent the system from engaging. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying problems. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as these controls are crucial for operation. Finally, don't overlook the brake pedal switch; a faulty switch can disrupt the cruise control functionality. By following these steps, you can effectively narrow down the potential causes of the problem and take the necessary actions to restore your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2020 Lexus LS500h?

When troubleshooting the cruise control system in a 2020 Lexus LS500h, several common problems may be at play. One of the primary culprits is a faulty speed sensor, which can hinder the system's ability to accurately gauge the vehicle's speed, resulting in failure to engage or maintain speed. Additionally, issues with the brake light switch can lead to unexpected disengagement of the cruise control when the brake pedal is pressed, even if this action is unintentional. Another potential issue is a malfunctioning throttle actuator, which can disrupt the system's ability to maintain the desired speed. Electrical problems, such as blown fuses or wiring issues, can also prevent the cruise control from functioning properly. Lastly, vacuum leaks within the cruise control system can interfere with its operation. For those looking to DIY, it's advisable to check these components systematically to identify and resolve the issue effectively.

How urgent is it to address the malfunctioning cruise control in my 2020 Lexus LS500h?

Addressing the malfunctioning cruise control in your 2020 Lexus LS500h is of utmost importance due to the significant safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, which can create dangerous driving conditions and increase the likelihood of accidents. Furthermore, a faulty cruise control system can detract from the overall driving experience, making it inconvenient and frustrating to maintain a consistent speed. Ignoring these symptoms not only compromises your safety but can also lead to higher fuel consumption as the vehicle struggles to maintain speed. Additionally, delaying repairs may result in more extensive damage to the vehicle's systems, ultimately leading to increased repair costs. Therefore, it is crucial to have the issue diagnosed and repaired by a qualified technician as soon as possible to ensure your safety and the optimal performance of your Lexus LS500h.

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