2017 Lexus RC350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Lexus RC350 and How to Fix Them

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Reviewed by
Devin Cabugcal
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 RC350 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 RC350 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 steps to diagnose the cruise control issue in a 2017 Lexus RC350?

To effectively diagnose a cruise control issue in a 2017 Lexus RC350, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable problem that can disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can lead to engagement issues. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into any underlying problems, allowing you to target specific components that may be malfunctioning. Following this, inspect the speed sensors, as they play a crucial role in the cruise control system; if they are not functioning correctly, the system may fail to engage. Additionally, verify the operation of the brake and clutch switches, since any malfunction here can disable the cruise control. Finally, conduct a thorough inspection of the wiring and connections associated with the cruise control system, looking for any signs of damage or loose connections that could be causing the issue. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control problem in your Lexus RC350.

What are the common problems that could cause the cruise control to stop working in a 2017 Lexus RC350?

When troubleshooting cruise control issues in a 2017 Lexus RC350, it's essential to understand the common problems that may lead to its malfunction. One frequent culprit is a faulty cruise control switch, which can hinder the system's ability to engage or disengage as intended. Additionally, a malfunctioning speed sensor can disrupt the system's capacity to maintain a consistent speed, while issues with the brake light switch may cause the cruise control to disengage unexpectedly when the brakes are applied. Another potential problem lies with the throttle actuator, which can affect the system's ability to adjust speed accurately. Lastly, electrical problems such as wiring issues or blown fuses can also interfere with the cruise control's operation. By identifying and addressing these common issues, you can effectively restore the functionality of the cruise control system in your vehicle.

How urgent is it to address the non-functioning cruise control in a 2017 Lexus RC350?

When it comes to a non-functioning cruise control in a 2017 Lexus RC350, the urgency of addressing the problem cannot be overstated. Cruise control is not just a luxury; it plays a crucial role in maintaining a steady speed, which can significantly reduce driver fatigue during long trips and enhance fuel efficiency. However, if this feature fails, it may signal deeper issues within the vehicle's electronic systems or sensors, potentially affecting other critical components. Ignoring a malfunctioning cruise control could lead to more severe problems down the line, including safety risks that could compromise your driving experience. Moreover, timely diagnosis and repair can prevent unexpected breakdowns, ensuring that your vehicle remains reliable and safe on the road. Therefore, it is advisable to prioritize the repair of your cruise control system to maintain the overall performance and safety of your Lexus RC350.

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