2015 Scion TC Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Scion tC 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 2015 Scion tC 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 Scion tC 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 2015 Scion tC?

To effectively diagnose a cruise control issue in a 2015 Scion tC, it is essential to adopt a systematic approach that begins with the simplest checks before progressing to more complex diagnostics. Start by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are not stuck or damaged, as this can prevent proper operation. Following this, check the speed sensors, which play a crucial role in the cruise control system; any malfunction here can lead to issues. Utilizing a diagnostic scanner to scan for error codes can provide valuable insights into any underlying problems. Additionally, inspect the vacuum lines for leaks, as compromised lines can significantly affect performance. Finally, test the cruise control module to confirm it is functioning correctly. If these steps do not resolve the issue, consulting a mechanic with expertise in Scion vehicles is recommended for further diagnosis and repair. This methodical approach not only helps in identifying the problem but also ensures that you address the most common issues first, potentially saving time and effort.

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

When troubleshooting cruise control issues in a 2015 Scion tC, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake pedal switch, which is designed to disengage the cruise control when the brake is applied; if this switch malfunctions, it can prevent the system from engaging. Another frequent issue is a malfunctioning speed sensor, as this component is crucial for maintaining the vehicle's set speed. Additionally, a blown fuse can disrupt the cruise control system, so checking the relevant fuses is a good first step. Problems with the throttle actuator, which regulates the engine's throttle, can also hinder cruise control functionality. Furthermore, issues with the Electronic Control Module (ECM) can affect various vehicle systems, including cruise control. Lastly, vacuum leaks in the engine can interfere with the cruise control's operation, making it vital to inspect for any leaks. By identifying and addressing these common problems, drivers can effectively troubleshoot and restore their cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2015 Scion tC?

When it comes to a malfunctioning cruise control in a 2015 Scion tC, urgency is paramount. Ignoring this issue can lead to serious safety risks, such as unexpected acceleration or deceleration, which could result in accidents or dangerous driving conditions. Additionally, a malfunctioning cruise control diminishes the comfort and convenience that this feature is designed to provide, particularly during long drives. Beyond immediate safety concerns, neglecting the problem can adversely affect the overall performance and efficiency of your vehicle, potentially leading to more extensive and costly repairs down the line. Furthermore, in many regions, driving a vehicle with known mechanical issues may violate road safety regulations, exposing you to legal repercussions. Therefore, it is crucial to have the cruise control system diagnosed and repaired by a qualified mechanic as soon as possible to ensure a safe and enjoyable driving experience.

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2015 Scion tC Cruise Control Issues & Solutions | RepairPal