Lexus LS460 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus LS460 and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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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 LS460 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 LS460 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.

Troubleshooting Cruise Control Issues in a Lexus LS460

When troubleshooting cruise control issues in your Lexus LS460, it's essential to adopt a systematic diagnostic approach. Start by checking the control module, sensors, and throttle, as these components are often the culprits behind malfunctioning cruise control. If you notice hesitation or surging while driving, these symptoms may indicate a deeper issue with the cruise control system. A practical test involves attempting to engage the cruise control while keeping the brake pedal pressed with your left foot; if the system tries to set, this could point to a misadjusted brake switch. Additionally, if your vehicle features radar-controlled cruise control, ensure that the radar system is functioning correctly, as any disruptions can significantly impact performance. By following these steps, you can effectively narrow down the potential causes of your cruise control issues, allowing for a more targeted repair or, if necessary, a consultation with a professional mechanic for further assistance.

What Could Cause the Cruise Control to Malfunction in a Lexus LS460?

When dealing with cruise control malfunctions in a Lexus LS460, it's crucial to recognize the common problems that may arise. One frequent issue is a failed control module, which can disrupt the communication between the cruise control system and the vehicle's engine management. Additionally, faulty sensors or switches can prevent the system from engaging properly, leading to frustration during drives. Throttle actuation problems are another potential culprit; if the throttle body is not responding correctly, the cruise control may fail to maintain speed. Mechanical issues, such as a damaged cable or vacuum actuator, can also hinder the system's performance, as these components are essential for proper operation. Lastly, electrical problems, including wiring faults or sensor malfunctions, can create significant challenges. By understanding these common failure modes, DIYers can better diagnose and address the specific issues affecting their Lexus LS460's cruise control system.

Why is the Cruise Control Not Working in a Lexus LS460?

When the cruise control in your Lexus LS460 fails to operate, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and further vehicle damage. The malfunction could stem from a variety of sources, including a failed control module, sensor, or switch, which are essential for the system's operation. Additionally, throttle actuation problems may hinder the cruise control's functionality, making it imperative to check these components. Mechanical issues, such as a damaged cable or vacuum actuator, can also disrupt the system, particularly in older models. Furthermore, electrical malfunctions or sensor failures can prevent the cruise control from engaging, which could lead to erratic vehicle behavior on the road. Lastly, a malfunctioning engine control unit (ECU) or cruise control module can significantly impact performance. Given the potential consequences of these issues, including compromised safety and increased repair costs, it is advisable to diagnose and resolve the problem as soon as possible to ensure a safe and reliable driving experience.

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