Lexus RC200t Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Lexus RC200t and How to Fix Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Lexus RC200t 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 RC200t 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 RC200t

When troubleshooting cruise control issues in your Lexus RC200t, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse in the fuse box, as a blown fuse is one of the most straightforward problems to resolve. If the fuse is intact, inspect the brake lights and the brake switch, as these components are crucial for the proper functioning of the cruise control system. A malfunctioning brake switch can inadvertently disable cruise control, so ensure it operates correctly. If the "check engine" light is illuminated, this could indicate a more serious underlying issue that may affect the cruise control. In such cases, using an OBD-II scanner can help identify specific error codes that guide further troubleshooting. If these initial checks do not resolve the issue, it may be time to consult a professional mechanic, especially if the problem involves complex electrical systems. Regular maintenance and prompt attention to warning lights can help prevent future cruise control failures, ensuring a safer driving experience.

What Could Cause the Cruise Control to Malfunction in a Lexus RC200t?

When dealing with cruise control malfunctions in a Lexus RC200t, it's crucial to understand the common problems that may arise. One of the first areas to investigate is the electrical system, particularly the fuses, as a blown fuse can disrupt the power supply to the cruise control, rendering it inoperable. Additionally, the brake pedal position sensor plays a vital role; if it fails, the system may not engage properly. Another potential issue lies within the throttle body, where malfunctions can hinder the cruise control's functionality. It's also important to check the PRNDL or shifter position switch, as problems here can prevent the cruise control from activating. The brake pedal switch is another critical component; if it is faulty, the cruise control may not turn on at all. Lastly, engine-related issues, including problems with the engine control unit (ECU), can significantly impact the cruise control system. By systematically examining these components, DIYers can effectively diagnose and address the underlying causes of cruise control malfunctions in their Lexus RC200t.

Why is the Cruise Control Not Working in a Lexus RC200t?

When your Lexus RC200t's cruise control fails, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and potentially more significant vehicle problems. Common culprits include a malfunctioning control module, faulty sensors, or issues with the throttle actuation system, all of which can disrupt the cruise control's functionality. Additionally, a blown fuse or a defective brake pedal switch may prevent the system from engaging, while problems with the throttle control or ABS could also contribute to the malfunction. In older models, a broken vacuum line might be the reason behind the failure. Furthermore, if the engine control unit (ECU) has a history of trouble codes, especially related to emissions, it can directly impact the cruise control system. It’s also essential to check for faulty brake lights or a malfunctioning brake switch, as these can trigger safety mechanisms that disable cruise control. By systematically checking these components, you can effectively troubleshoot the issue, ensuring your vehicle remains safe and reliable on the road.

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