2018 Lexus LC500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2018 Lexus LC500 and How to Fix Them

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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 LC500 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 LC500 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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 steps should I take to diagnose the cruise control issue in my 2018 Lexus LC500?

When diagnosing the cruise control issue in your 2018 Lexus LC500, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, examine the cruise control buttons on the steering wheel for any signs of sticking or malfunction, which could prevent proper operation. Utilizing an OBD-II scanner to check for error codes is a crucial step, as these codes can pinpoint specific problems within the system. Following this, assess the speed sensors, since their proper functioning is vital for cruise control to operate effectively. Additionally, inspect the wiring connections associated with the cruise control system for any damage or corrosion that could hinder performance. Finally, test the cruise control module itself to ensure it is working correctly, as a faulty module can be the root cause of the issue. By following this structured diagnostic approach, you can efficiently identify and address the cruise control problem in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2018 Lexus LC500?

When troubleshooting cruise control issues in a 2018 Lexus LC500, it's essential to understand the common problems that may lead to its malfunction. One frequent culprit is a faulty speed sensor, which can disrupt the system's ability to maintain the desired speed. Additionally, a malfunctioning brake light switch can cause the cruise control to disengage unexpectedly, even when the brakes are not applied. Problems with the throttle control system, such as a defective throttle position sensor, can also hinder the cruise control's performance. Electrical issues, including blown fuses or wiring faults, may further complicate the situation, while vacuum leaks in the engine can adversely affect overall performance, impacting the cruise control's functionality. If you encounter these issues, it's advisable to consult a qualified mechanic for a thorough inspection and accurate diagnosis to restore your cruise control system effectively.

How urgent is it to address the malfunctioning cruise control in my 2018 Lexus LC500?

When it comes to the malfunctioning cruise control in your 2018 Lexus LC500, the urgency of addressing the issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating a significant safety hazard on the road. This unpredictability not only compromises your safety but also that of other drivers. Additionally, neglecting cruise control problems can detract from your overall driving experience, making it inconvenient to use this feature when needed. Beyond immediate safety concerns, ignoring these symptoms may result in increased fuel consumption and potential damage to other vehicle components, leading to more extensive and costly repairs down the line. Therefore, it is crucial to have the issue diagnosed and repaired by a qualified mechanic as soon as possible, ensuring that your driving experience remains smooth, safe, and efficient.

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