2017 Lexus RX450h Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Lexus RX450h 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 2017 Lexus RX450h 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 2017 Lexus RX450h 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 2017 Lexus RX450h?

When troubleshooting the non-functioning cruise control in your 2017 Lexus RX450h, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, inspect the cruise control buttons on the steering wheel to ensure they are responsive and not stuck, as this can also prevent activation. Following this, verify the functionality of the speed sensor, which plays a crucial role in relaying the vehicle's speed to the cruise control system; a malfunction here can lead to issues. Additionally, examine the brake pedal switch, since the cruise control is designed to disengage when the brake is applied; a faulty switch may cause it to disengage unexpectedly. Lastly, inspect the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as these can impede communication between components. By methodically working through these steps, you can effectively identify and address the underlying issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2017 Lexus RX450h?

When troubleshooting the cruise control system in a 2017 Lexus RX450h, it's essential to consider several common problems that could be at play. A faulty speed sensor is often a primary culprit, as it plays a crucial role in relaying the vehicle's speed to the cruise control system; if it malfunctions, the system may fail to engage or maintain speed. Additionally, issues with the brake light switch can disrupt the cruise control function, since the system is designed to disengage when the brake pedal is pressed. Another potential issue is a malfunctioning throttle actuator, which controls the engine's throttle opening and is vital for maintaining speed. Electrical problems, such as wiring issues or blown fuses, can also hinder the cruise control's operation. Lastly, vacuum leaks in the engine can affect the system's performance, as cruise control relies on vacuum pressure to function correctly. By systematically checking these components, DIYers can effectively diagnose and address the issues preventing the cruise control from working properly.

How urgent is it to address the malfunctioning cruise control in a 2017 Lexus RX450h?

Addressing a malfunctioning cruise control in a 2017 Lexus RX450h is of utmost urgency due to the significant safety risks it poses. A faulty system can lead to unexpected acceleration or deceleration, which not only jeopardizes the driver’s control but also endangers other road users. Furthermore, if the cruise control fails to maintain a consistent speed, it can disrupt driving stability, making it difficult to navigate safely. Ignoring these symptoms can result in increased fuel consumption and may lead to more severe damage to the vehicle's engine or transmission, ultimately escalating repair costs. By promptly addressing the cruise control malfunction, you not only enhance your safety on the road but also protect your vehicle’s performance and longevity, making it a critical issue that should not be overlooked.

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