2019 Lexus ES300h Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2019 Lexus ES300h 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 ES300h 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 ES300h 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 2019 Lexus ES300h?

To effectively diagnose a cruise control issue in a 2019 Lexus ES300h, 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 in the fuse box, 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, as faulty buttons can lead to engagement issues. Utilizing an OBD-II scanner to check for error codes is a crucial step, as these codes can reveal specific malfunctions within the cruise control system. Following this, verify the functionality of the vehicle's speed sensors, since they are integral to the cruise control's operation. Additionally, examine the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as these can impede performance. Finally, test the cruise control module itself to confirm it is working correctly, as a malfunctioning module can prevent the system from engaging or maintaining speed. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue.

What are the common problems that could cause the cruise control to stop working in a 2019 Lexus ES300h?

When troubleshooting the cruise control system in a 2019 Lexus ES300h, it's essential to understand the common problems that may lead to its malfunction. One frequent issue is a faulty speed sensor, which can disrupt the system's ability to detect the vehicle's speed accurately, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can interfere with cruise control functionality, as the system is designed to disengage when the brake pedal is pressed. A blown fuse related to the cruise control system can also cause it to stop working altogether. Furthermore, a malfunction in the throttle control, such as a faulty throttle position sensor, can hinder the system's ability to maintain speed effectively. Lastly, any electrical issues, including wiring problems or a malfunctioning control module, can lead to the cruise control becoming inoperable. By identifying these potential issues, DIY enthusiasts can better diagnose and address the problems affecting their vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2019 Lexus ES300h?

When it comes to the malfunctioning cruise control in your 2019 Lexus ES300h, the urgency of addressing this issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating a significant safety risk while driving. This unpredictability not only compromises your control over the vehicle but can also endanger other road users. Furthermore, cruise control problems can detract from your overall driving experience, making it difficult to maintain a consistent speed, especially during long highway drives. Ignoring these symptoms may also result in increased fuel consumption, as inconsistent speed can lead to higher operational costs over time. Additionally, timely intervention can prevent further damage to your vehicle's systems, potentially saving you from more extensive and costly repairs down the line. Therefore, it is crucial to have any cruise control issues diagnosed and repaired by a qualified technician as soon as possible to ensure your safety and the longevity of your vehicle.

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