Lexus RX450hL Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus RX450hL 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 RX450hL 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 RX450hL 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 RX450hL

When troubleshooting cruise control issues in your Lexus RX450hL, begin by checking the most accessible components. Start with the control module, sensor, and throttle, as these are often the primary culprits behind cruise control malfunctions. If you notice intermittent functionality, inspect the cruise control switch and its related components, as they may require attention. Next, examine the fuse and brake system; a blown fuse or a faulty brake light switch can disrupt the cruise control system's operation. Pay particular attention to the brake pedal switch, as a failure here can prevent cruise control from engaging even if the brake lights are operational. Lastly, before diving into the more complex dynamic radar cruise control system, ensure that the pre-collision system is functioning correctly, as issues here can also impact cruise control performance. By following this diagnostic approach, you can effectively identify and resolve the underlying issues affecting your vehicle's cruise control system.

What Could Cause the Cruise Control to Malfunction in a Lexus RX450hL?

When dealing with cruise control malfunctions in a Lexus RX450hL, it's essential to consider several common problems that could be affecting the system. One of the first things to check is the fuses related to the cruise control system; a blown fuse can interrupt the power supply and prevent the system from functioning. Additionally, the brake pedal sensor plays a crucial role in engaging cruise control, so if this sensor is defective, it may hinder the system's operation. Another area to investigate is the throttle control system, as any issues here can directly impact cruise control functionality. Furthermore, problems with the Anti-lock Braking System (ABS) can also interfere with cruise control, as the two systems are interconnected. Lastly, for older models, a broken vacuum line may be a potential cause of malfunction. By systematically checking these components, DIYers can effectively diagnose and resolve cruise control issues in their Lexus RX450hL.

Why is the Cruise Control Not Working in a Lexus RX450hL?

When the cruise control in your Lexus RX450hL is not functioning, it is crucial to address the issue without delay, as neglecting it can lead to safety risks and further damage to your vehicle. Common culprits include a failed control module, sensor, or switch, which can disrupt the entire cruise control system. Additionally, throttle actuation problems may prevent the system from engaging properly, while damaged mechanical components in older models can exacerbate the situation. A blown fuse or a defective brake pedal switch are also frequent offenders that can interrupt cruise control functionality. Moreover, issues with the throttle control system or the ABS can significantly impact performance. By diagnosing and resolving these issues promptly, you not only ensure your safety on the road but also maintain the overall health of your vehicle, preventing more costly repairs down the line.

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