2006 Lexus RX400h Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2006 Lexus RX400h 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 2006 Lexus RX400h 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 2006 Lexus RX400h 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 steps to diagnose the non-functioning cruise control in a 2006 Lexus RX400h?

To effectively diagnose the non-functioning cruise control in your 2006 Lexus RX400h, begin with a systematic approach that prioritizes simpler checks before moving on to 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 issue that can disrupt the system. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can prevent the system from engaging. Following this, verify the functionality of the speed sensor, since a malfunction here can directly impact cruise control performance. It's also crucial to check the brake pedal switch, which is designed to disengage the cruise control when the brake is applied; a faulty switch can inadvertently disable the system. If these initial checks do not reveal the problem, use a diagnostic scanner to look for any error codes that may indicate specific issues within the cruise control system. Finally, assess the cruise control module itself to ensure it is sending the correct signals; a defective module may require replacement. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2006 Lexus RX400h?

When troubleshooting the cruise control system in a 2006 Lexus RX400h, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty brake light switch, which is crucial for the cruise control's operation; if this switch malfunctions, it may prevent the system from engaging properly, as it is designed to deactivate when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to erratic behavior or complete failure of the cruise control. Another factor to investigate is the presence of vacuum leaks in the engine, as these can hinder the cruise control's performance by affecting its ability to maintain speed. Furthermore, a defective cruise control module may also be responsible for the system's malfunction, as it is the central component that controls cruise functions. Lastly, electrical problems, such as blown fuses or damaged wiring, can significantly impact the cruise control system's operation. By systematically checking these areas, DIYers can effectively diagnose and resolve issues with the cruise control in their Lexus RX400h.

How urgent is it to address the non-functioning cruise control in a 2006 Lexus RX400h?

When considering the urgency of fixing a non-functioning cruise control in a 2006 Lexus RX400h, it's essential to recognize that while this issue may not present an immediate safety hazard, it still warrants prompt attention. A malfunctioning cruise control can detract from the overall driving experience, particularly on long journeys where maintaining a consistent speed is crucial for comfort and fatigue reduction. Ignoring this problem could lead to increased driver frustration and potentially higher fuel consumption due to erratic speed management. Moreover, ensuring that all vehicle systems, including cruise control, are functioning properly contributes to the overall safety and reliability of your vehicle. Therefore, while it may not be as critical as addressing brake or engine failures, timely diagnosis and repair of the cruise control system can enhance your driving experience and prevent further complications down the road. For DIY enthusiasts, understanding the importance of this system can motivate you to investigate and resolve the issue sooner rather than later, ensuring a smoother and more enjoyable ride.

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