2016 Lexus IS300 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2016 Lexus IS300 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 2016 Lexus IS300 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 2016 Lexus IS300 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2016 Lexus IS300?

When troubleshooting the non-functional cruise control in your 2016 Lexus IS300, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown fuse can often be the simplest explanation for the issue. Next, inspect the cruise control switch on the steering wheel to ensure it is not stuck or damaged, as this can prevent the system from engaging. If these initial checks do not resolve the problem, use a diagnostic scanner to look for any error codes that may indicate underlying issues within the vehicle's onboard computer. Additionally, verify the functionality of the brake pedal switch, which is crucial for disengaging the cruise control when the brakes are applied. Following this, examine the vehicle speed sensor to confirm it is accurately sending signals to the cruise control system. Finally, test the cruise control module itself to ensure it is receiving power and operating correctly. By following these steps in order, you can effectively 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 2016 Lexus IS300?

When troubleshooting cruise control issues in a 2016 Lexus IS300, it's essential to consider several common problems that may be at play. One of the first areas to check is the brake pedal switch, as a faulty switch can prevent the cruise control from engaging or disengaging correctly. Additionally, speed sensor malfunctions can lead to inaccurate speed readings, which may disrupt the cruise control's functionality. It's also wise to inspect the vehicle's fuses, as a blown fuse in the cruise control system can render the feature inoperative. Another critical component to examine is the throttle actuator; if it is malfunctioning, it may fail to maintain the desired speed. Lastly, issues with the Electronic Control Module (ECM) can interfere with communication between the cruise control system and the engine, leading to further complications. By systematically checking these components, DIYers can often identify and resolve the underlying issues affecting their cruise control system.

How urgent is it to address the non-functioning cruise control in a 2016 Lexus IS300?

Addressing a non-functioning cruise control in a 2016 Lexus IS300 is crucial for both safety and driving comfort. When this feature fails, it not only diminishes the convenience of maintaining a steady speed during long drives but also raises concerns about underlying electronic issues that could affect other vehicle systems. Ignoring the problem can lead to increased driver fatigue and a reliance on manual acceleration, which may become hazardous, especially on highways. Moreover, a malfunctioning cruise control could indicate deeper mechanical or electronic faults that, if left unchecked, might escalate into more significant repairs. Therefore, it is essential to prioritize the inspection and repair of the cruise control system to ensure a safe and enjoyable driving experience. Taking prompt action not only restores functionality but also safeguards against potential safety risks associated with unexpected failures while driving.

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