2019 Lexus RX350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2019 Lexus RX350 and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2019 Lexus RX350 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 2019 Lexus RX350 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.

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 2019 Lexus RX350?

When faced with a non-functioning cruise control in your 2019 Lexus RX350, start by checking the cruise control fuse, as a blown fuse can often be the simplest explanation for the issue. Next, ensure that the cruise control settings are properly configured; sometimes, the system may not engage if the settings are incorrect. If these initial checks do not resolve the problem, use a diagnostic scanner to look for any error codes that could indicate a deeper issue within the cruise control system. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as stuck or broken buttons can prevent the system from operating. Finally, test the cruise control to see if it engages at all, even if it fails to maintain speed, as this can provide valuable information about the nature of the problem. By following these steps, you can effectively narrow down the potential causes of the cruise control malfunction and take the necessary actions to fix it.

What are the common problems that could cause the cruise control to stop working in a 2019 Lexus RX350?

When troubleshooting cruise control issues in a 2019 Lexus RX350, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake pedal switch, which is crucial for disengaging the cruise control when the brake is applied; if this switch malfunctions, it can prevent the system from engaging properly. Additionally, issues with the speed sensor can disrupt the cruise control's ability to maintain a steady speed, leading to erratic performance. A blown fuse related to the cruise control system can also be a straightforward yet often overlooked reason for failure. Furthermore, problems with the throttle control system can hinder the cruise control's effectiveness in maintaining speed. Lastly, if the Electronic Control Module (ECM) is experiencing issues, it can significantly impact the cruise control functionality, as the ECM manages various vehicle systems. For DIY enthusiasts, understanding these potential issues can guide you in diagnosing the problem, but consulting a qualified mechanic is advisable for a thorough inspection and repair.

How urgent is it to address the non-functioning cruise control in a 2019 Lexus RX350?

When it comes to the non-functioning cruise control in a 2019 Lexus RX350, addressing the issue promptly is crucial for both safety and vehicle performance. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper electronic or sensor-related problems that could affect other critical systems in your vehicle. Ignoring this issue could lead to more significant complications, potentially compromising your vehicle's overall functionality and safety on the road. By taking immediate action to diagnose and repair the cruise control, you not only enhance your driving experience but also mitigate the risk of encountering more severe mechanical failures down the line. Therefore, if you notice any irregularities with your cruise control, it is advisable to investigate and resolve the issue as soon as possible to ensure your Lexus RX350 remains safe and reliable.

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2019 Lexus RX350 Cruise Control Issues & Repair Estimates