2015 Lexus CT200h Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2015 Lexus CT200h

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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 2015 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 2015 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.

What are the steps to diagnose the non-functioning cruise control in a 2015 Lexus CT200h?

To effectively diagnose the non-functioning cruise control in your 2015 Lexus CT200h, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse in the fuse box, as a blown fuse can often be the simplest explanation for the issue. Next, examine the cruise control buttons on the steering wheel to ensure they are not stuck or malfunctioning. Following this, check the speed sensors, which are vital for cruise control operation, to confirm they are functioning correctly. Utilizing an OBD-II scanner can provide valuable insights by revealing any error codes related to the cruise control system. Additionally, verify that the brake lights are operational, as a failure here can inadvertently disengage the cruise control. If these preliminary checks do not resolve the issue, proceed to test the cruise control module to ensure it is sending the correct signals. Lastly, inspect the wiring and connections for any signs of damage or looseness that could disrupt the system. If the problem persists after these steps, seeking assistance from a professional mechanic may be necessary for a thorough diagnosis and repair. This methodical approach not only helps in identifying the root cause but also saves time and resources in the troubleshooting process.

What are the common problems that could cause the cruise control to stop working in a 2015 Lexus CT200h?

When troubleshooting cruise control issues in a 2015 Lexus CT200h, it's essential to consider several common problems that may be at play. One of the first components to check is the brake light switch, as a malfunction here can prevent the cruise control from engaging; this switch is designed to deactivate the system when the brake pedal is pressed. Additionally, the speed sensor plays a crucial role in maintaining a constant speed, and any faults in this sensor can lead to cruise control failure. It's also wise to inspect the fuses related to the cruise control system, as a blown fuse can completely disable its functionality. Furthermore, the throttle actuator, which regulates engine speed, may also be malfunctioning, impacting the cruise control's performance. Lastly, issues with the Electronic Control Module (ECM) can disrupt various vehicle functions, including cruise control. By systematically checking these components, DIYers can often identify the root cause of the problem and take appropriate steps to restore their cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2015 Lexus CT200h?

When it comes to your 2015 Lexus CT200h, addressing a malfunctioning cruise control system is not just a matter of convenience; it is a critical safety concern. A properly functioning cruise control system allows for a consistent speed, which can significantly reduce driver fatigue during long journeys. However, if this system fails, it can lead to erratic speed changes that may catch you off guard, especially in high-traffic situations or on highways. This unpredictability not only endangers your safety but also that of other road users. Moreover, neglecting to fix the issue can exacerbate the problem, potentially leading to more extensive and costly repairs down the line. Therefore, it is essential to prioritize the repair of your cruise control system to ensure a safe driving experience and to protect your vehicle from further complications. Taking prompt action can save you time, money, and, most importantly, keep you safe on the road.

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