2015 Lexus IS250 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Lexus IS250 and How to Fix Them

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Reviewed by
Andrew Hajjar
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 2015 Lexus IS250 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 2015 Lexus IS250 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.

What are the steps to diagnose the cruise control issue in a 2015 Lexus IS250?

To effectively diagnose a cruise control issue in a 2015 Lexus IS250, it's essential to adopt a systematic approach that begins with the simplest potential problems before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel for any signs of sticking or malfunction, as these controls are crucial for operation. If these initial checks do not reveal the issue, utilize an OBD-II scanner to identify any error codes that may indicate specific problems within the cruise control system. Following this, examine the cruise control module for any visible damage or loose connections, ensuring it is securely attached. Additionally, testing the cruise control actuator is vital, as it plays a key role in maintaining the vehicle's speed. Finally, verify the functionality of the vehicle speed sensor, as an inaccurate signal can lead to cruise control malfunctions. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue in your Lexus IS250.

What are the common problems that could cause the cruise control to stop working in a 2015 Lexus IS250?

When troubleshooting the cruise control system in a 2015 Lexus IS250, it's essential to understand the common problems that may lead to its malfunction. One of the primary culprits is a faulty cruise control switch, which can hinder the system's ability to engage or disengage as intended. Additionally, a blown fuse within the cruise control circuit can disrupt its functionality, making it crucial to check the fuse box for any issues. Another significant factor is the speed sensor; if it is malfunctioning, it can prevent the cruise control from maintaining the desired speed. Furthermore, a malfunctioning brake light switch can cause the cruise control to disengage unexpectedly when the brakes are applied, leading to potential safety concerns. Lastly, issues with the throttle actuator, which controls the engine's throttle response, can also impact the cruise control's performance. By diagnosing these common issues, you can effectively restore the cruise control functionality in your Lexus IS250, ensuring a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in a 2015 Lexus IS250?

When dealing with a malfunctioning cruise control in a 2015 Lexus IS250, it is crucial to recognize the urgency of the situation. While it may not seem like an immediate emergency, neglecting this issue can lead to significant safety risks, such as unexpected acceleration or deceleration, which can endanger both the driver and other road users. Additionally, a faulty cruise control system can adversely affect fuel efficiency, resulting in higher fuel costs and a less enjoyable driving experience. Therefore, addressing the malfunction promptly is essential not only for maintaining the functionality of this feature but also for ensuring a safe and efficient driving environment. By prioritizing repairs, you can enhance your vehicle's performance and enjoy a smoother ride, making it a worthwhile investment of your time and resources.

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2015 Lexus IS250 Cruise Control Issues & Repair Guide