2001 Subaru Legacy Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2001 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 2001 Subaru Legacy 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.

What are the initial steps to diagnose the non-functioning cruise control in a 2001 Subaru Legacy?

To effectively diagnose the non-functioning cruise control in a 2001 Subaru Legacy, begin with a systematic approach that prioritizes simpler fixes. Start by checking the cruise control fuse, as a blown fuse can often be the culprit behind the system's failure. Refer to your owner's manual for the fuse box diagram to locate the specific fuse associated with the cruise control. If the fuse is intact, proceed to inspect the cruise control switch and the clutch pedal safety switch, as these components can also hinder functionality. Next, verify the cruise control module, sensor, and switch for any signs of failure, as these are common issues in Subaru vehicles. Additionally, examine the throttle actuation system, since problems here can directly affect cruise control performance. Finally, check the vacuum hose connected to the cruise servo to ensure it maintains a proper vacuum; testing for air suction can help identify leaks or blockages. If these initial steps do not resolve the issue, it may be time to consult a factory-trained technician for a more thorough diagnosis. This methodical approach not only saves time but also enhances your understanding of the vehicle's systems, making it easier to identify and resolve the problem.

What common issues cause cruise control failure in a 2001 Subaru Legacy?

When dealing with cruise control failure in a 2001 Subaru Legacy, it's essential to understand the common problems that may be at play. One frequent issue is a malfunctioning control module, which can disrupt the entire cruise control system. Additionally, problems with the throttle position sensor can lead to erratic behavior, as the engine's computer may overcompensate by injecting excess fuel, often resulting in black exhaust. Furthermore, faulty switches or sensors can prevent the cruise control from engaging or maintaining speed. Throttle actuation issues are also notable, as they can hinder the system's ability to respond correctly to driver inputs. By identifying these potential failure modes, DIYers can better diagnose the problem and take the necessary steps to restore their vehicle's cruise control functionality.

How urgent is it to repair the non-functioning cruise control in a 2001 Subaru Legacy?

While the non-functioning cruise control in your 2001 Subaru Legacy may not present an immediate safety hazard, it is important to recognize the potential inconveniences it can cause, especially during long drives. If the issue stems from minor problems like a blown fuse or a faulty brake pedal switch, you might find it manageable to delay repairs. However, if the malfunction is linked to more critical components such as the throttle control system or vacuum lines, neglecting these issues could lead to more significant problems down the line, potentially affecting vehicle performance and safety. Therefore, while the urgency may vary based on your driving habits, addressing the cruise control issue sooner rather than later can enhance your overall driving experience and prevent further complications.

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