2020 Subaru Legacy Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Subaru Legacy 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2020 Subaru Legacy 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.

What steps should I take to diagnose the cruise control issue in my 2020 Subaru Legacy?

To effectively diagnose the cruise control issue in your 2020 Subaru Legacy, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, examine the cruise control buttons on your steering wheel to ensure they are responsive and not malfunctioning. Following this, verify the operation of the speed sensor, which is essential for the cruise control system to function correctly. If these initial checks do not reveal the problem, utilize an OBD-II scanner to identify any error codes that may indicate specific issues. Additionally, ensure that your brake lights are functioning properly, as a faulty brake light switch can prevent the cruise control from engaging. Finally, inspect the vacuum lines for any leaks or damage, as these can significantly impact the performance of the cruise control system. By following this structured diagnostic approach, you can efficiently identify and address the underlying issues affecting your vehicle's cruise control.

What are the common problems that could cause the cruise control to stop working in a 2020 Subaru Legacy?

When the cruise control in your 2020 Subaru Legacy ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue. One of the first things to check is the fuse associated with the cruise control system; a blown fuse can easily disrupt its operation. Additionally, the brake pedal switch plays a crucial role, as it is designed to deactivate the cruise control when the brake is pressed. If this switch is faulty, it may prevent the system from engaging. Another potential culprit is the speed sensor; if it malfunctions, the cruise control may struggle to maintain a consistent speed. Furthermore, issues with the throttle control system can also impact the cruise control's performance, leading to erratic behavior or complete failure. Lastly, a defective cruise control module can be the root of the problem, as it is responsible for the overall functionality of the system. By systematically checking these components, you can identify the cause of the cruise control failure and take the necessary steps to repair it, ensuring a smoother driving experience.

How urgent is it to address the non-functioning cruise control in a 2020 Subaru Legacy?

When it comes to a non-functioning cruise control in your 2020 Subaru Legacy, understanding the urgency of the situation is crucial for both safety and vehicle performance. While the immediate risk may not seem severe, neglecting this issue can lead to a less enjoyable driving experience, particularly on long trips where cruise control is most beneficial. The convenience of maintaining a steady speed not only reduces driver fatigue but also enhances fuel efficiency, making it an essential feature for many drivers. Furthermore, ignoring the malfunction could signal underlying problems within the vehicle's electrical system, which may escalate if left unaddressed. Therefore, while it may not require immediate action, it is wise to investigate the issue sooner rather than later. A timely inspection can help ensure that your cruise control system operates smoothly, preserving both your comfort and the overall health of your vehicle.

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