2021 Lexus ES300h Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2021 Lexus ES300h 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 2021 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 2021 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 initial diagnostic steps to troubleshoot the cruise control issue in a 2021 Lexus ES300h?

When troubleshooting the cruise control issue in your 2021 Lexus ES300h, begin by ensuring that the cruise control settings are properly configured and activated. This simple step can often resolve the problem if the system is inadvertently turned off or not set correctly. Next, inspect the cruise control buttons on the steering wheel for any signs of damage or debris that could hinder their operation; a quick cleaning might restore functionality. It's also essential to verify the speed sensor, as this component is crucial for maintaining a constant speed; any malfunctions here can directly impact cruise control performance. Additionally, check the relevant fuses to ensure none are blown, as this could interrupt the system's operation. If these initial checks do not yield results, using a diagnostic scanner to scan for error codes can provide insights into any underlying issues. Lastly, inspect the wiring and connections associated with the cruise control system for any loose or damaged components, and if necessary, consider testing the cruise control module itself for faults. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2021 Lexus ES300h?

When the cruise control in your 2021 Lexus ES300h ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit is a faulty speed sensor, which is essential for the cruise control system to accurately gauge your vehicle's speed. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Another common issue is related to the brake light switch; if this switch is defective, it may not signal the cruise control to disengage when the brake pedal is pressed, leading to operational problems. Additionally, a malfunction in the throttle control system, such as a faulty throttle position sensor, can disrupt the cruise control's ability to maintain speed. Electrical problems, including blown fuses or wiring issues, can also prevent the cruise control from working correctly. Lastly, vacuum leaks in the engine can affect the necessary vacuum pressure for the cruise control system to function properly. By identifying these potential issues, you can take the first steps toward troubleshooting and possibly fixing the cruise control system in your vehicle.

How urgent is it to address the malfunctioning cruise control in my 2021 Lexus ES300h?

Addressing a malfunctioning cruise control system in your 2021 Lexus ES300h is crucial for several reasons. First and foremost, a faulty cruise control can lead to unexpected acceleration or deceleration, significantly increasing the risk of accidents on the road. This safety concern is compounded during long drives or highway travel, where consistent speed is essential for comfort and control. Additionally, neglecting this issue can result in higher fuel consumption, as the vehicle struggles to maintain a steady pace. Over time, the underlying problems may worsen, leading to more extensive damage to the vehicle's systems and ultimately resulting in higher repair costs. Therefore, it is imperative to prioritize the repair of your cruise control system to ensure not only your safety but also the longevity and efficiency of your Lexus ES300h.

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