2012 Toyota Prius Cruise Control Not Working

Common Causes of Cruise Control Malfunctions in Your 2012 Toyota Prius 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 2012 Toyota Prius 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 2012 Toyota Prius 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 2012 Toyota Prius?

When diagnosing a cruise control issue in a 2012 Toyota Prius, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the fuses associated with the cruise control system to ensure they are intact, as a blown fuse can easily disrupt functionality. Next, verify that the vehicle is in the correct gear and that the brake light switch is operational, as these basic settings can often be the root of the problem. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into specific issues, such as communication failures with the steering angle sensor. Inspecting the dynamic radar cruise control sensor for cleanliness and obstructions is also crucial, along with ensuring that all related connections and sensors are secure. A weak 12V battery can lead to various malfunctions, so confirm its condition as well. If the cruise control switch or the clock spring in the steering wheel is suspected to be faulty, testing or replacing these components may be necessary. Sometimes, simply resetting the system by holding the cruise control main switch can resolve the issue. Additionally, consider any recent maintenance that may have affected sensor alignment. For further guidance, consulting the owner's manual or online resources can provide model-specific troubleshooting steps. If these methods do not yield results, seeking professional diagnosis from a qualified mechanic or Toyota dealership may be the best course of action to ensure a thorough evaluation and repair.

What are the common problems that could cause the cruise control to stop working in a 2012 Toyota Prius?

When the cruise control in your 2012 Toyota Prius ceases to function, several common issues may be at play. One of the primary culprits is a damaged or faulty brake pedal switch, which can mistakenly signal that the brake is engaged, thus disabling the cruise control. Additionally, a blown fuse in the cruise control system can interrupt its operation; checking and replacing the fuse may resolve the issue, but if it blows again, further electrical diagnostics may be necessary. Another potential problem is a damaged speed sensor, which is crucial for providing accurate speed readings to the cruise control system. If the speed sensor is malfunctioning, it can also affect the speedometer, indicating a need for immediate attention. Furthermore, issues with the clock spring, which connects the steering wheel controls to the vehicle's electrical system, can hinder the functionality of the cruise control buttons. In some cases, dynamic radar or sensor issues may arise, particularly in models equipped with advanced cruise control features, where obstructions or sensor malfunctions can prevent operation. Lastly, it’s essential to consider user error or incorrect mode settings, as certain driving modes may disable cruise control. By systematically checking these areas, you can effectively diagnose and potentially fix the cruise control issues in your Prius.

How urgent is it to address the non-functioning cruise control in a 2012 Toyota Prius?

When dealing with a non-functioning cruise control in a 2012 Toyota Prius, it's essential to understand the urgency of the situation. While the cruise control feature itself may not seem critical to immediate safety, the underlying issues that could be causing the malfunction warrant prompt attention. For instance, a faulty brake pedal switch can lead to inconsistent brake light operation, which is vital for safe communication with other drivers. Similarly, a damaged speed sensor may not only affect cruise control but also compromise the accuracy of your speedometer, potentially leading to speeding violations or accidents. Additionally, a blown fuse could indicate broader electrical problems that might impact other essential vehicle systems. Therefore, while you may not need to rush to a mechanic, it is advisable to diagnose and address the issue sooner rather than later to prevent further complications and ensure your vehicle operates safely and efficiently. Taking proactive steps can save you from more significant repairs down the line and enhance your overall driving experience.

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Diagnosing Cruise Control Problems in 2012 Toyota Prius