2017 Lexus IS350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Lexus IS350 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
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 2017 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 2017 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 are the steps to diagnose the non-functioning cruise control in a 2017 Lexus IS350?

To effectively diagnose the non-functioning cruise control in your 2017 Lexus IS350, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the fuse box, as a blown fuse can easily disrupt the system. Next, examine the cruise control buttons on the steering wheel to ensure they are operational and not stuck, as this can prevent engagement. Following this, check the speed sensors for any dirt or damage, since these components are crucial for the cruise control's functionality. Utilizing an OBD-II scanner can help you identify any error codes that may indicate specific issues within the cruise control system. Additionally, verify that the brake lights are functioning properly, as a faulty brake light switch can inhibit cruise control activation. If these preliminary checks do not resolve the issue, proceed to test the cruise control module to confirm it is receiving power and sending signals correctly. Should the problem persist after these steps, it may be necessary to consult a professional mechanic or dealership for a more thorough diagnosis and repair. This methodical approach not only saves time but also enhances your chances of identifying the root cause of the problem efficiently.

What are the common problems that could cause the cruise control to stop working in a 2017 Lexus IS350?

When dealing with a malfunctioning cruise control system in a 2017 Lexus IS350, it's essential to understand the common problems that could be at play. One frequent issue is a faulty brake pedal switch, which can disrupt the system's ability to engage or disengage properly. Additionally, speed sensor problems can lead to incorrect speed readings, further complicating the functionality of cruise control. A blown fuse is another simple yet often overlooked culprit that can prevent the system from operating as intended. Furthermore, a malfunctioning throttle actuator may hinder the cruise control's ability to maintain the desired speed, while issues with the Electronic Control Module (ECM) can affect various vehicle functions, including cruise control. If you find yourself facing this issue, it's wise to consult a qualified mechanic who can accurately diagnose and resolve the specific problem affecting your vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2017 Lexus IS350?

When it comes to the malfunctioning cruise control in your 2017 Lexus IS350, the urgency of addressing the issue cannot be overstated. A faulty cruise control system poses significant safety risks, as it can lead to unexpected changes in speed, making it difficult to maintain control of your vehicle, particularly in high-traffic situations. This unpredictability increases the likelihood of accidents, which can have serious consequences not only for you but also for other road users. Moreover, neglecting this issue can adversely affect your vehicle's overall performance and efficiency, leading to a less enjoyable driving experience. Additionally, what may start as a minor malfunction could escalate into more severe damage to your vehicle's systems, resulting in costly repairs down the line. Therefore, it is crucial to prioritize the repair of your cruise control system to ensure your safety, maintain optimal vehicle performance, and avoid unnecessary expenses.

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