2018 Lexus GS450h Cruise Control Isn't Working

Fix cruise control issues in your 2018 Lexus GS450h for restored functionality.

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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 2018 Lexus GS450h 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 GS450h 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 are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2018 Lexus GS450h?

When troubleshooting the non-functioning cruise control in a 2018 Lexus GS450h, start with the simplest solutions before moving on to more complex diagnostics. Begin by checking the cruise control fuse in the fuse box; a blown fuse can easily disrupt the system. Next, ensure that the cruise control settings are correctly configured according to the vehicle's manual, as incorrect settings can prevent activation. If these initial checks do not resolve the issue, use a diagnostic scanner to look for any error codes that may indicate specific problems within the cruise control system. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as these controls are essential for operation. It’s also important to test the brake pedal switch, since cruise control disengages when the brake is applied; a faulty switch could be the culprit. Finally, verify the functionality of the vehicle speed sensor, as it is critical for the cruise control system to operate correctly. By following these steps, you can effectively diagnose and potentially resolve the cruise control issue in your Lexus GS450h.

What are the common problems that could cause the cruise control to stop working in a 2018 Lexus GS450h?

When dealing with cruise control malfunctions in a 2018 Lexus GS450h, it's essential to understand the common problems that may arise. One frequent culprit is a faulty cruise control switch, which can hinder the system's ability to engage or disengage as intended. Additionally, a blown fuse within the cruise control circuit can disrupt its operation entirely, making it crucial to check the fuse box for any issues. Another significant factor is the speed sensor; if it malfunctions, the cruise control may struggle to maintain a consistent speed, leading to erratic behavior. Furthermore, the brake light switch plays a vital role in the cruise control system, as it is designed to deactivate the cruise control when the brakes are applied. If this switch is faulty, it can prevent the cruise control from functioning correctly. Lastly, a failure in the throttle actuator can impede the system's ability to adjust speed accurately. By understanding these common problems, DIYers can effectively troubleshoot and potentially resolve cruise control issues in their Lexus GS450h.

How urgent is it to address the malfunctioning cruise control in my 2018 Lexus GS450h?

Addressing the malfunctioning cruise control in your 2018 Lexus GS450h is of utmost importance due to the immediate safety risks it poses. A faulty cruise control system can lead to unexpected acceleration or deceleration, increasing the likelihood of accidents on the road. Moreover, neglecting this issue can exacerbate the problem, potentially causing damage to other vehicle systems, which may result in more extensive and costly repairs down the line. Beyond safety and repair costs, a properly functioning cruise control system enhances your driving experience by providing comfort and efficiency during long trips. Therefore, it is crucial to prioritize the repair of your cruise control to ensure not only your safety but also the longevity and performance of your vehicle.

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2018 Lexus GS450h Cruise Control Issues & Repair Costs