Toyota Prius Prime Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Toyota Prius Prime and How to Fix Them

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Reviewed by
Aisha
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 Toyota Prius Prime 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 Toyota Prius Prime 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 Toyota Prius Prime

When troubleshooting cruise control issues in your Toyota Prius Prime, start by checking the simplest components first. Begin with the fuses and switches, as these are often the culprits behind malfunctioning systems. If these appear intact, inspect the brake light switch and the AC recirc button, as they can inadvertently affect cruise control functionality. Next, examine the throttle position sensor, since a failure here can lead to erratic engine behavior and impact cruise control performance. If these checks do not resolve the issue, consult the Repair Manual for a detailed Problem Symptoms Table that outlines more complex problems, such as control module or ECM failures. Understanding the features of your cruise control system, including how to properly engage the dynamic radar cruise control, can also aid in identifying operational issues. By following this structured approach, you can effectively diagnose and potentially resolve cruise control problems in your Prius Prime.

Troubleshooting Cruise Control Issues in a Toyota Prius Prime

When dealing with cruise control issues in your Toyota Prius Prime, it's essential to understand the common problems that may arise. A malfunctioning control module, faulty sensors, or defective switches can lead to cruise control failures, preventing the system from maintaining a steady speed. Additionally, throttle actuation problems can disrupt the functionality of cruise control, making it crucial to check these components. If you see a warning message like "Cruise Control is Unavailable," a simple reset by turning the system off and back on may resolve the issue. It's also wise to inspect for blown fuses or faulty switches, as these can often be the culprits behind cruise control malfunctions. For those experiencing issues with dynamic cruise control, activating the "constant speed" feature by holding the cruise control main switch for a few seconds can sometimes restore functionality. By systematically addressing these common problems, you can enhance your driving experience and ensure that your cruise control system operates smoothly.

Why is the Cruise Control Not Working in a Toyota Prius Prime?

When the cruise control in your Toyota Prius Prime malfunctions, it’s crucial to address the issue promptly to avoid potential safety risks and further damage to the vehicle. A blown fuse is a common culprit that can easily be checked and replaced, but neglecting this simple fix could lead to more complex electrical problems. Additionally, if the control module, sensors, or switches are failing, they may not only disrupt cruise control functionality but could also affect other systems in your car, leading to costly repairs. Throttle actuation issues can compromise your vehicle's performance, making it essential to investigate these symptoms without delay. Furthermore, a malfunctioning clock spring can impact various controls, including the cruise system, and ignoring this could result in more extensive repairs down the line. Lastly, ensuring that your cruise control settings are compatible with your driving mode is vital; failing to do so may lead to unexpected behavior while driving. By taking the time to troubleshoot these potential issues, you can maintain the safety and reliability of your Prius Prime, ensuring a smoother and more secure driving experience.

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