Lexus CT200h Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus CT200h 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 Lexus CT200h 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 Lexus CT200h 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.

Troubleshooting Cruise Control Issues in a Lexus CT200h

When troubleshooting cruise control issues in your Lexus CT200h, begin by checking the basics to rule out simple problems. Start with the control module, sensor, and throttle, as these components are often the culprits behind malfunctioning cruise control. Ensure that the cruise control is properly set and that you understand how to cancel it, as incorrect operation can sometimes be mistaken for a fault. If your vehicle is equipped with Dynamic Radar Cruise Control, familiarize yourself with its features, as improper use can lead to confusion regarding functionality. Pay attention to any intermittent engagement issues, which may be linked to the engine braking "B" setting; this can prevent the cruise control from activating even if the indicator light is illuminated. If you notice inconsistent functionality, it may be beneficial to consult with a dealer for a more thorough diagnosis, especially if the problem persists after checking these initial areas. By systematically addressing these aspects, you can effectively narrow down the cause of the cruise control issue and work towards a resolution.

What Could Cause the Cruise Control to Malfunction in a Lexus CT200h?

When dealing with cruise control malfunctions in a Lexus CT200h, it's essential to consider several common problems that could be at play. A failed control module, sensor, or switch can disrupt the system's functionality, making it crucial to inspect these components for any signs of wear or damage. Additionally, throttle actuation issues may arise, which can prevent the cruise control from engaging properly. A malfunctioning throttle position sensor is another potential culprit; if it fails, the engine's computer may mismanage fuel delivery, leading to noticeable black exhaust emissions. Furthermore, problems with the engine control unit (ECU) or the module responsible for cruise control can also hinder performance. Utilizing a diagnostic tool to clear any error codes in these modules can often resolve the issue. Lastly, it's important to check specific settings, such as the engine braking "B" setting, as these can also affect cruise control engagement. By understanding these common problems, DIY enthusiasts can effectively troubleshoot and potentially resolve cruise control issues in their Lexus CT200h.

Why is the Cruise Control Not Working in a Lexus CT200h?

When the cruise control in your Lexus CT200h is not functioning, it is crucial to address the issue without delay. Ignoring symptoms such as unexpected disengagement or failure to engage can lead to unsafe driving conditions, particularly on long trips where maintaining speed is essential for safety. A malfunctioning cruise control system may indicate underlying problems, such as a faulty cruise control switch or issues with the speed sensor, which can compromise your vehicle's overall performance. Additionally, a malfunctioning brake light switch or blown fuse can not only disrupt the cruise control but also affect other critical systems in your car. By promptly diagnosing and resolving these issues, you not only enhance your driving experience but also prevent potential damage to your vehicle, ensuring that you remain safe on the road. Therefore, if you notice any irregularities with your cruise control, it is advisable to consult a qualified mechanic to identify and rectify the problem swiftly.

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