Lexus NX300 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus NX300 and How to Fix Them

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Reviewed by
Bo Fader
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 Lexus NX300 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 Lexus NX300 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.

Troubleshooting Cruise Control Issues in a Lexus NX300

When troubleshooting cruise control issues in your Lexus NX300, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components first, such as the control module, sensors, and switches. Look for any visible signs of damage or wear that could indicate a malfunction. If these components appear to be functioning correctly, move on to inspecting the throttle system, as problems here can directly affect cruise control performance. Additionally, if you encounter the "Radar Cruise Control Unavailable" message, it's crucial to understand that this indicates a temporary unavailability of the system, often due to environmental factors or system resets. In such cases, patience is key; simply wait for the system to become operational again before further attempts. By following this methodical approach, you can effectively diagnose and potentially resolve cruise control issues, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Lexus NX300?

When dealing with cruise control malfunctions in a Lexus NX300, it's essential to understand the common problems that may arise. One significant factor could be a malfunction in the engine control unit (ECU) or the specific module responsible for the cruise control system, which can disrupt its functionality. Additionally, sensor blockage caused by debris or ice can hinder the adaptive cruise control and automatic emergency stopping features, making regular cleaning of the vehicle's sensors a crucial maintenance step. Another potential issue lies in the air intake vents of the hybrid battery; if these vents are dirty, they may trigger warning messages that indicate a need for inspection by a Lexus dealer. Lastly, technical glitches within the control module, sensors, or throttle can also contribute to cruise control failures. By being aware of these common problems, DIYers can effectively diagnose and address the issues, ensuring their Lexus NX300 operates smoothly.

Why is it Critical to Fix the Cruise Control in a Lexus NX300?

Neglecting to fix the cruise control in your Lexus NX300 can lead to serious safety risks and costly repairs. A malfunctioning cruise control system can result in erratic speed changes, increasing the likelihood of accidents, especially during long drives where maintaining a steady speed is essential. Additionally, if the cruise control is not functioning properly, it can negatively impact your vehicle's fuel efficiency, leading to excessive fuel consumption and potential engine strain. This not only affects your wallet but can also cause further damage to critical components, such as the throttle position sensor. Moreover, addressing cruise control issues promptly is vital for preventive maintenance; ignoring these problems can escalate into more extensive repairs that could have been avoided. Lastly, in some areas, having a functional cruise control system is a legal requirement, and failing to comply could result in fines or complications during vehicle inspections. Therefore, it is crucial to prioritize fixing your cruise control to ensure a safe, efficient, and legally compliant driving experience.

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