2020 Toyota Prius Prime Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Toyota Prius Prime and How to Fix Them

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Reviewed by
Devin Cabugcal
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 2020 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 2020 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.

What steps should I take to diagnose the cruise control issue in my 2020 Toyota Prius Prime?

When diagnosing a cruise control issue in your 2020 Toyota Prius Prime, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by examining the cruise control fuse, as a blown fuse is a common and easily fixable problem that can disrupt the system's functionality. Next, inspect the cruise control buttons on your steering wheel to ensure they are working properly, since malfunctioning buttons can prevent the system from engaging. Utilizing an OBD-II scanner to check for error codes is also essential, as these codes can pinpoint specific issues within the cruise control system. Additionally, verify the operation of the speed sensors, which are vital for the cruise control to function correctly. Pay attention to the wiring connections associated with the cruise control system; any loose or damaged wires can lead to significant malfunctions. Finally, if all other components appear to be in good condition, test the cruise control module itself, as a failure here can be the source of your troubles. By systematically following these steps, you can effectively diagnose and resolve the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Toyota Prius Prime?

When the cruise control in your 2020 Toyota Prius Prime ceases to function, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the primary culprits is a faulty brake light switch, which is crucial for the cruise control system as it disengages when the brake pedal is pressed. If this switch is malfunctioning, it may prevent the cruise control from engaging at all. Another potential issue is related to the speed sensor; if this component is not accurately relaying speed information, the cruise control may struggle to maintain a constant speed. Additionally, the throttle actuator plays a vital role in controlling engine speed, and any malfunction here can lead to cruise control failure. Electrical problems, such as blown fuses or damaged wiring, can also disrupt the system's functionality. Lastly, software glitches within the vehicle's onboard computer can occasionally cause the cruise control to misbehave. By identifying these common issues, you can take the first steps toward diagnosing and resolving the cruise control problems in your Prius Prime.

How urgent is it to address the malfunctioning cruise control in a 2020 Toyota Prius Prime?

When dealing with a malfunctioning cruise control in a 2020 Toyota Prius Prime, the urgency of addressing the issue cannot be overstated. A faulty cruise control system can lead to unexpected acceleration or deceleration, creating significant safety risks on the road. This unpredictability not only endangers the driver and passengers but also poses a threat to other road users. Additionally, a malfunctioning system can disrupt the driving experience, making it challenging to maintain a consistent speed, which can be frustrating and negatively impact fuel efficiency. Promptly addressing the issue is crucial for maintaining the vehicle's optimal performance and preventing further damage to the cruise control system or related components. It is advisable to conduct a diagnostic check with a qualified mechanic to identify the root cause of the malfunction. If the vehicle is still under warranty, seeking assistance from an authorized Toyota service center is recommended to ensure that repairs are covered. Overall, prioritizing the repair of a malfunctioning cruise control system is essential for ensuring safety, enhancing driving comfort, and preserving the vehicle's performance.

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