2019 Toyota Prius C Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2019 Toyota Prius C 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2019 Toyota Prius C 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 2019 Toyota Prius C 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 initial diagnostic steps to take when the cruise control isn't working on a 2019 Toyota Prius C?

When faced with a malfunctioning cruise control system in your 2019 Toyota Prius C, 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; a faulty button can prevent the system from engaging. It's also crucial to verify the functionality of the speed sensor, as any malfunction here can disrupt the cruise control's operation. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into specific issues affecting the system. Additionally, ensure that the brake lights are functioning correctly, as they are integral to the cruise control's operation; faulty brake lights can inadvertently disable the system. Finally, examine the wiring connections associated with the cruise control for any signs of damage or looseness, as poor connections can lead to operational failures. By following these steps, you can effectively diagnose and address the cruise control issues in your Prius C, potentially saving time and money on repairs.

What are the common problems that could cause the cruise control to stop working in a 2019 Toyota Prius C?

When troubleshooting cruise control issues in a 2019 Toyota Prius C, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake pedal switch, which is crucial for disengaging the cruise control when the brake is applied; if this switch malfunctions, it can prevent the system from engaging properly. Additionally, speed sensor issues can disrupt the cruise control's functionality, as the system relies on accurate speed readings to maintain the desired speed. A blown fuse related to the cruise control system can also lead to a complete failure of the feature, while problems with the throttle actuator can hinder the system's ability to control engine speed effectively. Lastly, if the Electronic Control Module (ECM) encounters issues, it can impact various vehicle functions, including cruise control. If you experience any of these problems, it's advisable to consult a qualified mechanic for a thorough inspection and diagnosis to ensure your cruise control system is restored to proper working order.

How urgent is it to address the malfunctioning cruise control in my 2019 Toyota Prius C?

Addressing a malfunctioning cruise control system in your 2019 Toyota Prius C is crucial for several reasons. First and foremost, a faulty cruise control can lead to unexpected acceleration or deceleration, significantly increasing the risk of accidents on the road. This safety concern should not be taken lightly, as it can endanger not only your life but also the lives of others. Additionally, a malfunctioning system can negatively impact your vehicle's fuel efficiency, leading to higher fuel costs and a less enjoyable driving experience. Over time, neglecting this issue may result in further damage to your vehicle's systems, which could necessitate more extensive and costly repairs. Therefore, it is essential to address any cruise control malfunctions promptly to ensure your safety, maintain optimal fuel efficiency, and protect the overall health of your vehicle.

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2019 Toyota Prius C Cruise Control Issues & Repair Costs