2005 Scion TC Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Scion tC and How to Fix Them

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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 2005 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 2005 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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 non-functional cruise control in a 2005 Scion tC?

When troubleshooting the non-functional cruise control in your 2005 Scion tC, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can prevent the system from engaging. Following this, verify the speed sensor, which is crucial for the cruise control to maintain speed; a faulty sensor can disrupt the entire system. Additionally, examine the brake pedal switch, since the cruise control is designed to disengage when the brake is applied, and a malfunction here can lead to issues. If these initial checks do not resolve the problem, consider using a diagnostic scanner to identify any error codes that may indicate specific faults within the system. Lastly, inspect the vacuum lines connected to the cruise control system for any leaks or damage, as these can also cause malfunctions. By following these steps, you can effectively diagnose and potentially resolve the cruise control issues in your Scion tC.

What are the common problems that could cause the cruise control to stop working in a 2005 Scion tC?

When dealing with a malfunctioning cruise control system in a 2005 Scion tC, it's essential to understand the common problems that could be at play. One of the primary culprits is a faulty brake pedal switch, which is designed to disengage the cruise control when the brake is pressed; if this switch fails, it can prevent the system from engaging. Another frequent issue is a defective speed sensor, which disrupts the communication between the vehicle's speed system and the cruise control, leading to erratic behavior. Additionally, a blown fuse in the cruise control circuit can halt its operation entirely, making it crucial to check and replace any blown fuses. Vacuum leaks in the engine can also impact the cruise control's ability to maintain speed, so inspecting vacuum lines for leaks is a wise step. Furthermore, a malfunctioning cruise control module may require replacement to restore functionality. Lastly, various electrical issues, including wiring problems or a faulty cruise control switch, can contribute to the system's failure. By systematically addressing these potential issues, DIYers can effectively troubleshoot and resolve the cruise control problems in their Scion tC.

How urgent is it to address the malfunctioning cruise control in a 2005 Scion tC?

Addressing the malfunctioning cruise control in a 2005 Scion tC is of utmost urgency due to the significant safety risks it poses. A faulty cruise control system can lead to unexpected acceleration or deceleration, which not only jeopardizes the driver’s control over the vehicle but also endangers other road users. This is particularly critical during highway driving, where maintaining a consistent speed is essential for safe navigation. Furthermore, neglecting this issue can adversely affect the vehicle's overall performance, leading to inconsistent speed control and potential strain on the engine, which may result in costly repairs down the line. Additionally, it is important to consider the legal ramifications; driving a vehicle with known mechanical issues could violate road safety regulations, potentially resulting in fines or penalties. Therefore, it is highly advisable to promptly address any cruise control malfunctions to ensure safety, maintain optimal vehicle performance, and comply with legal standards. Regular maintenance and timely repairs are key to preventing accidents and ensuring the reliability of your vehicle on the road.

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