2018 Lexus LS500h Cruise Control Isn't Working

Fix Cruise Control Issues in Your 2018 Lexus LS500h for Restored Functionality

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Reviewed by
Aisha
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 2018 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 2018 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-functional cruise control in a 2018 Lexus LS500h?

When faced with a non-functional cruise control in your 2018 Lexus LS500h, start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, verify the functionality of the cruise control switch; a malfunctioning switch may prevent the system from engaging. It's also crucial to inspect the speed sensors, as any issues here can directly affect cruise control performance. Utilizing a diagnostic scanner to check for error codes can provide further insights into potential problems. Lastly, ensure that your brake lights are working correctly, since a faulty brake light switch can interfere with cruise control functionality. By systematically addressing these areas, you can effectively diagnose and potentially resolve the issue with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2018 Lexus LS500h?

When troubleshooting cruise control issues in a 2018 Lexus LS500h, it's important to consider several common problems that could be at play. One of the primary culprits is a faulty speed sensor, which is crucial for the system to maintain the desired speed accurately. If the speed sensor is malfunctioning, it may not relay the correct information to the cruise control system, leading to erratic behavior. Another potential issue is the brake light switch; if this switch is defective, it can cause the cruise control to disengage unexpectedly, even when the brakes are not applied. Additionally, problems with the throttle control system, such as a malfunctioning throttle position sensor, can hinder the cruise control's ability to maintain speed. Electrical issues, including blown fuses or wiring problems, can also disrupt the system's functionality. Lastly, vacuum leaks in the engine can affect the cruise control's operation by preventing the engine from maintaining a steady speed. By understanding these common problems, DIY enthusiasts can perform preliminary checks and potentially resolve the issue before consulting a mechanic.

How urgent is it to address the malfunctioning cruise control in a 2018 Lexus LS500h?

When it comes to a malfunctioning cruise control in your 2018 Lexus LS500h, the urgency to address the issue cannot be overstated. Ignoring symptoms such as erratic speed control or unresponsive settings can lead to serious safety risks, including unexpected acceleration or deceleration that could result in accidents. Moreover, a faulty cruise control system can significantly detract from your driving experience, making long trips less enjoyable and more stressful. Timely intervention not only enhances your vehicle's performance but also prevents potential damage to the cruise control system itself, which could lead to more costly repairs down the line. Additionally, if your vehicle is still under warranty, addressing the issue promptly may allow you to take advantage of coverage, saving you from unexpected expenses. Therefore, it is crucial to prioritize the repair of your cruise control system to ensure both your safety and the longevity of your vehicle.

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2018 Lexus LS500h Cruise Control Issues & Fix Guide