Toyota Prius C Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Toyota Prius C 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 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 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.

Troubleshooting Cruise Control Issues in a Toyota Prius C

When troubleshooting cruise control issues in your Toyota Prius C, begin by examining the most accessible components. Start with the brake light switch, as a malfunction here can prevent the cruise control from engaging. Next, check the AC recirc button and the clock spring, as these can also impact the system's functionality. If these initial checks do not resolve the issue, inspect the wiring harnesses for any disconnections or damage, as well as the fuses related to the cruise control system. Should these steps not yield results, consider the possibility of faulty switches, relays, or even speed sensor problems, which may require more in-depth diagnostics. Keep an eye out for symptoms such as dashboard indicators not functioning correctly, as these can provide clues to the underlying issue. If the problem persists after these checks, it may be time to consult a qualified mechanic for a thorough diagnosis, ensuring your vehicle remains safe and reliable on the road.

What Could Cause Cruise Control Issues in a Toyota Prius C?

When troubleshooting cruise control issues in a Toyota Prius C, it's essential to be aware of several common problems that may affect the system's functionality. Start by inspecting the cruise control fuse, as a blown fuse can render the system inoperable. Next, consider the possibility of malfunctioning components such as the control module, sensors, or switches, which are vital for the cruise control's operation. A faulty throttle position sensor can also lead to complications, causing the engine's computer to mismanage fuel delivery and potentially resulting in black exhaust emissions. Additionally, issues with the speed sensor or defective switches can further complicate the situation. In some cases, more intricate problems involving the control module or engine control module (ECM) may be the root cause. By familiarizing yourself with these common failure modes, you can effectively diagnose and resolve cruise control issues in your Toyota Prius C, enhancing your overall driving experience.

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

When the cruise control in your Toyota Prius C is not functioning, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks during long drives. Common culprits include a failed control module, sensor, or switch, which can disrupt the system's operation. Additionally, throttle actuation problems may prevent the cruise control from engaging properly. A blown fuse is another frequent cause that can easily be overlooked, yet it’s a simple fix that can restore functionality. Furthermore, issues with the brake light switch or clock spring cable can also interfere with cruise control, particularly if other steering wheel functions are affected. By identifying and resolving these issues quickly, you not only enhance your driving experience but also ensure your safety on the road.

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