2023 Subaru Legacy Cruise Control Isn't Working

Troubleshooting Common Issues with Cruise Control in Your 2023 Subaru Legacy 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 2023 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 are the initial steps to diagnose the cruise control issue in a 2023 Subaru Legacy?

To effectively diagnose cruise control issues in your 2023 Subaru Legacy, begin with the simplest checks to rule out common problems. Start by inspecting the cruise control fuse; a blown fuse can easily disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can prevent engagement. Utilizing an OBD-II scanner is a crucial step to identify any error codes that may indicate specific malfunctions within the cruise control system. Additionally, verify the functionality of the vehicle speed sensor, as it is essential for the cruise control to operate correctly. Lastly, check the brake lights and the brake light switch, since any malfunction here can inhibit the cruise control from engaging. By following this structured approach, you can systematically identify and address the root cause of the cruise control issue, making your DIY diagnosis more efficient and effective.

What are the common problems that could cause the cruise control to stop working in a 2023 Subaru Legacy?

When your 2023 Subaru Legacy's cruise control stops functioning, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit 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 altogether. Another potential issue is related to the speed sensor; if this component is not accurately relaying speed information, the cruise control may fail to maintain a constant speed. Additionally, a blown fuse in the cruise control circuit can disrupt its operation, so checking the fuses is a simple first step. Throttle control malfunctions, often stemming from a faulty throttle position sensor, can also hinder the cruise control's ability to function properly. Lastly, vacuum leaks in the engine can affect the performance of the cruise control system, leading to erratic behavior or complete failure. By systematically checking these components, you can effectively troubleshoot and potentially resolve the cruise control issues in your Subaru Legacy.

How urgent is it to address the malfunctioning cruise control in a 2023 Subaru Legacy?

When it comes to a malfunctioning cruise control in your 2023 Subaru Legacy, the urgency to address the issue cannot be overstated. A faulty cruise control system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which significantly increases the risk of accidents on the road. Ignoring these symptoms not only jeopardizes your safety but can also result in more severe complications, including damage to other vehicle systems that may require costly repairs down the line. Therefore, it is crucial to act swiftly by either conducting a thorough inspection yourself or seeking assistance from a qualified mechanic. By prioritizing the repair of your cruise control system, you ensure not only your safety but also the longevity and reliability of your vehicle.

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