Subaru Justy Cruise Control Isn't Working

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

Troubleshooting Cruise Control Issues in a Subaru Justy

When troubleshooting cruise control issues in your Subaru Justy, it's essential to adopt a methodical diagnostic approach. Start by checking the cruise control fuse, as a blown fuse can often be the simplest fix. Next, inspect the brake pedal switch, which is crucial for the cruise control's operation; a malfunction here can prevent the system from engaging. If these initial checks do not resolve the issue, examine the throttle control system for any irregularities, as problems in this area can directly affect cruise control functionality. Additionally, consider the ABS system, as faults here may also interfere with cruise control operations. For older models, inspect the vacuum lines for any damage or leaks, as these can disrupt the system's performance. Lastly, be aware that engine-related issues, such as a check engine light, can impact cruise control; addressing these problems is vital for restoring full functionality. By following this structured approach, you can effectively diagnose and potentially resolve cruise control issues in your Subaru Justy before seeking professional assistance.

What Could Cause the Cruise Control to Malfunction in a Subaru Justy?

When dealing with cruise control malfunctions in a Subaru Justy, it's essential to consider several common problems that could be at fault. A blown fuse or a defective brake pedal switch is often the first thing to check, as these components are crucial for the cruise control system's operation. Additionally, issues with the throttle control system or the anti-lock braking system (ABS) can disrupt the functionality of cruise control, making it vital to inspect these systems as well. For older Subaru Justy models, a broken vacuum line may be the source of the problem, as these lines are integral to maintaining proper pressure for the cruise control to function. If your vehicle is equipped with the Subaru EyeSight suite, be aware that any malfunctions in the camera system that detects surrounding vehicles can also impact cruise control performance. Lastly, don't overlook the possibility of a faulty brake light, a malfunctioning brake switch, or even engine-related issues, as these can all contribute to cruise control failure. By systematically checking these components, DIYers can effectively diagnose and potentially resolve cruise control issues in their Subaru Justy.

Why is the Cruise Control Not Working in a Subaru Justy?

When the cruise control in your Subaru Justy is not functioning, it is crucial to address the issue without delay. Ignoring symptoms such as the system failing to engage can lead to unsafe driving conditions, particularly on long trips where maintaining a steady speed is essential for safety and fuel efficiency. Common culprits behind cruise control failure include a blown fuse, a defective brake pedal switch, or issues with the throttle control system. If the brake pedal switch is malfunctioning, the vehicle may mistakenly believe the brakes are engaged, preventing the cruise control from activating. Additionally, in older models, a broken vacuum line can disrupt the system's operation, as cruise control often relies on vacuum pressure to maintain throttle control. Given that these problems can not only affect your driving experience but also pose significant safety risks, it is advisable to have your vehicle inspected by a professional as soon as possible to diagnose and rectify the underlying issues. Taking prompt action can help prevent further complications and ensure your Subaru Justy remains safe and reliable on the road.

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Subaru Justy Cruise Control Issues & Repairs | RepairPal