2020 Lexus RC F Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Lexus RC F 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 2020 Lexus RC F 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 2020 Lexus RC F 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 steps should I take to diagnose the cruise control issue in my 2020 Lexus RC F?

When diagnosing a cruise control issue in your 2020 Lexus RC F, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily rectifiable problem. Next, examine the cruise control buttons on your steering wheel to ensure they are functioning correctly, since faulty buttons can lead to operational failures. After that, verify the performance of the speed sensor, which is essential for maintaining the desired speed. Utilizing an OBD-II scanner can help you identify any error codes that may indicate specific issues within the cruise control system. Additionally, check that all brake lights are operational, as any malfunction can disrupt the cruise control functionality. It's also important to inspect the vacuum lines for any leaks or damage, as these can significantly impact the system's performance. If you've gone through these steps and the issue persists, testing the cruise control module itself may be necessary, as it is responsible for controlling the entire system. By following this structured diagnostic process, you can effectively pinpoint and resolve the underlying cause of the cruise control problem in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Lexus RC F?

When troubleshooting the cruise control system in a 2020 Lexus RC F, it's essential to understand the common problems that may lead to its failure. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can interfere with cruise control functionality, as the system is designed to disengage when the brake pedal is pressed. A blown fuse related to the cruise control system can also cause it to malfunction, cutting off power to essential components. Furthermore, a malfunction in the throttle control mechanism can hinder the cruise control's ability to sustain a consistent speed. Lastly, issues with the electronic control module (ECM), which oversees various vehicle functions including cruise control, can lead to operational failures. If you experience any of these issues, it is advisable to consult a qualified mechanic for a thorough inspection and diagnosis.

How urgent is it to address the non-functioning cruise control in a 2020 Lexus RC F?

When it comes to a non-functioning cruise control in a 2020 Lexus RC F, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potentially more extensive vehicle damage. A malfunctioning cruise control system often signals underlying issues within the vehicle's electronic systems or sensors, which, if left unchecked, could escalate into more serious problems that require costly repairs. Moreover, the convenience of cruise control, especially during long drives, is compromised, leading to increased driver fatigue and reduced fuel efficiency. Therefore, it is crucial for DIY enthusiasts to prioritize the inspection and repair of the cruise control system to ensure not only the vehicle's optimal performance but also the safety and comfort of all passengers. Taking prompt action can prevent minor issues from developing into major headaches down the road.

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