2020 Lexus NX300h Cruise Control Isn't Working

Fixing cruise control issues in your 2020 Lexus NX300h for restored functionality

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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 2020 Lexus NX300h 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 NX300h 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 steps should I take to diagnose the cruise control issue in my 2020 Lexus NX300h?

When diagnosing the cruise control issue in your 2020 Lexus NX300h, it's essential to adopt a systematic approach that begins with the simplest checks before progressing to more complex diagnostics. Start by examining the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on your steering wheel to ensure they are operational, since faulty buttons can lead to engagement problems. Following this, verify the speed sensor's performance, as it plays a crucial role in maintaining your vehicle's speed; any malfunction here can directly affect cruise control operation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into specific issues within the cruise control system. Additionally, ensure that your brake lights are functioning correctly, as they are interconnected with the cruise control system and can cause it to disengage unexpectedly if faulty. Don't overlook the vacuum lines associated with the cruise control system; any leaks or damage can significantly impair its performance. If, after these checks, the issue remains unresolved, it may be time to consult a professional mechanic or an authorized Lexus service center for a comprehensive diagnosis and repair. By following this structured diagnostic approach, you can effectively identify and address the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Lexus NX300h?

When troubleshooting cruise control issues in a 2020 Lexus NX300h, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty speed sensor, which can disrupt the system's ability to maintain the desired speed. Additionally, a malfunctioning brake light switch may cause the cruise control to disengage unexpectedly, even when the brakes are not applied. It's also worth checking for a blown fuse, as this can prevent the cruise control from operating altogether. Problems with the throttle control system, particularly a faulty throttle position sensor, can hinder the cruise control's performance as well. Lastly, any electrical issues, such as damaged wiring or a malfunctioning control module, can lead to significant operational failures. By systematically examining these areas, DIYers can effectively diagnose and potentially fix the cruise control system in their Lexus NX300h.

How urgent is it to address the malfunctioning cruise control in my 2020 Lexus NX300h?

Addressing a malfunctioning cruise control in your 2020 Lexus NX300h is crucial for maintaining both safety and vehicle performance. A faulty system can lead to unexpected acceleration or deceleration, significantly increasing the risk of accidents on the road. Moreover, the inconvenience of a malfunctioning cruise control can detract from the comfort of long drives, making highway travel less enjoyable. Ignoring this issue not only compromises your driving experience but can also lead to higher fuel consumption due to inconsistent speed management. Additionally, delaying repairs may result in more severe damage to the vehicle's systems, ultimately leading to costly repairs. Therefore, it is essential to prioritize the repair of your cruise control system to ensure your safety, enhance your driving comfort, and protect your investment in the vehicle.

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