2018 Toyota Highlander Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2018 Toyota Highlander and How to Fix Them

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Reviewed by
Bo Fader
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 2018 Toyota Highlander 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 2018 Toyota Highlander 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.

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 2018 Toyota Highlander?

To effectively diagnose a cruise control issue in your 2018 Toyota Highlander, begin with the simplest checks to avoid unnecessary complications. Start by inspecting the cruise control fuse; a blown fuse is a common culprit that can easily disrupt functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are responsive and not stuck, as faulty buttons can prevent the system from engaging. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes that may indicate specific issues within the cruise control system. Following this, assess the speed sensors, which are vital for the cruise control's operation; malfunctioning sensors can lead to erratic behavior. Additionally, inspect the wiring and connections for any signs of damage or corrosion, as poor connections can hinder performance. If all else fails, test the cruise control module itself, as a defective module can be the root of the problem. Should the issue persist after these steps, it may be time to consult a professional mechanic who specializes in cruise control systems for further diagnosis and repair. By following this structured approach, you can systematically identify and address the cruise control issue in your Highlander.

What are the common problems that could cause the cruise control to stop working in a 2018 Toyota Highlander?

When the cruise control in your 2018 Toyota Highlander 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 brake light switch, which is crucial for the cruise control system as it disengages the system when the brake pedal is pressed. If this switch is malfunctioning, it may prevent the cruise control from engaging at all. Another potential issue could be related to the speed sensor; if this component fails, the cruise control will struggle to maintain a constant speed, leading to erratic behavior or complete failure. Additionally, a blown fuse can disrupt the electrical flow to the cruise control system, rendering it inoperable. Throttle control malfunctions can also impact cruise control functionality, as they are integral to maintaining speed. Lastly, problems with the Electronic Control Module (ECM) can affect various vehicle functions, including cruise control, and may require more in-depth diagnostics. By identifying these common issues, you can take the first steps toward resolving the problem and restoring your Highlander's cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2018 Toyota Highlander?

When it comes to a malfunctioning cruise control system in a 2018 Toyota Highlander, the urgency to address the issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating a significant safety hazard for both the driver and other road users. Ignoring these symptoms not only increases the risk of accidents but can also result in more extensive damage to the vehicle's electronic systems, leading to costly repairs down the line. For DIY enthusiasts, it is crucial to recognize that while some troubleshooting may be possible, the complexity of modern vehicle systems often necessitates professional inspection and repair to ensure safety and proper functionality. Therefore, taking prompt action to diagnose and resolve cruise control issues is essential for maintaining safe driving conditions and preventing further complications.

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