2019 Lexus IS350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2019 Lexus IS350 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2019 Lexus IS350 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 2019 Lexus IS350 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 steps should I take to diagnose the cruise control issue in my 2019 Lexus IS350?

When diagnosing the cruise control issue in your 2019 Lexus IS350, it's essential to adopt a systematic approach that begins with the simplest solutions 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 to ensure they are operational, since faulty buttons can lead to engagement problems. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into any underlying issues affecting the cruise control system. Additionally, verify that the speed sensors are functioning correctly, as they are critical for maintaining the desired speed. Don't overlook the brake and clutch switches, as malfunctioning components here can prevent the cruise control from engaging or disengaging properly. Finally, conduct a thorough inspection of the wiring and connections associated with the cruise control system, looking for any signs of damage or corrosion that could hinder performance. By following this structured diagnostic approach, you can effectively identify and address the root cause of the cruise control malfunction in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2019 Lexus IS350?

When the cruise control in your 2019 Lexus IS350 ceases to function, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the primary culprits is a faulty cruise control switch, which may fail to engage or disengage the system properly. Additionally, a blown fuse can disrupt the electrical flow necessary for the cruise control to operate, so checking the fuses is a good first step. Another potential issue is a malfunctioning speed sensor, which is crucial for maintaining the desired speed; if it’s not working correctly, the cruise control may not function as intended. Furthermore, the brake light switch plays a vital role in the system, as it is designed to deactivate cruise control when the brake pedal is pressed; if this switch is faulty, it can prevent activation. Lastly, problems with the throttle actuator can hinder the system's ability to adjust speed accurately. By systematically checking these components, you can identify and address the issue, potentially restoring your cruise control functionality without the need for professional assistance.

How urgent is it to address the malfunctioning cruise control in my 2019 Lexus IS350?

When it comes to the malfunctioning cruise control in your 2019 Lexus IS350, the urgency of addressing this issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating hazardous driving conditions that could result in accidents. Moreover, such issues may signal deeper problems within your vehicle's electronic systems or sensors, which can compromise overall performance and safety. Ignoring these symptoms not only risks your safety but can also lead to increased fuel consumption and potential damage to other vehicle components. By addressing the malfunction promptly, you can prevent further damage and potentially save on costly repairs down the line. Therefore, it is crucial to have the issue diagnosed and repaired by a qualified mechanic as soon as possible to ensure your safety and the optimal functioning of your vehicle.

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2019 Lexus IS350 Cruise Control Not Working: Causes & Fixes