2008 Toyota Prius Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 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 2008 Toyota Prius cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 2008 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 why the cruise control isn't working on a 2008 Toyota Prius?

To effectively diagnose why the cruise control isn't functioning on your 2008 Toyota Prius, start with a systematic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the clock spring, as it is a common culprit for control malfunctions in this model. Next, examine the mechanical components, such as the vacuum actuator and throttle cable, for any signs of damage that could hinder operation. Additionally, check for minor faults like blown fuses or worn switches, which are often overlooked but can easily disrupt the cruise control system. If these initial checks do not resolve the issue, it may be prudent to consult a professional mechanic for a thorough diagnosis and cost estimate. Remember, using a malfunctioning cruise control can pose safety risks, so it’s best to refrain from using it until the problem is addressed. By following this diagnostic approach, you can efficiently identify and potentially resolve the issue with your vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in a 2008 Toyota Prius?

Addressing a malfunctioning cruise control in your 2008 Toyota Prius should be considered a priority, as neglecting this issue can lead to significant safety risks and discomfort during driving. A malfunctioning system can result in erratic speed changes, which may be particularly dangerous in varying traffic conditions or on highways where maintaining a steady speed is crucial. Additionally, the convenience of long-distance travel is compromised when the cruise control fails, making it more tiring to drive. Simple diagnostic steps, such as checking the cruise control fuse, can often reveal straightforward issues that can be easily resolved. However, if the problem stems from more complex components like the control module or sensors, professional assistance may be necessary to ensure the system is restored to full functionality. Timely attention to this issue not only enhances your driving experience but also contributes to the overall safety of you and your passengers, making it essential to address any cruise control malfunctions as soon as they arise.

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