Why is my Subaru Legacy cruise control not working?
The cruise control system in your Subaru Legacy is a convenient feature that allows you to maintain a steady speed without constantly pressing the accelerator. However, when it stops working, it can be frustrating and inconvenient. In this article, we’ll explore the common reasons why your Subaru Legacy’s cruise control might not be functioning and what you can do to address the issue.
Common Reasons for Cruise Control Failure
There are several potential causes for your Subaru Legacy’s cruise control to stop working. These issues can range from simple fixes to more complex mechanical or electrical problems. Below are the most common reasons:
- Faulty Brake Light Switch: The cruise control system is designed to disengage when you press the brake pedal. If the brake light switch is malfunctioning, it may send incorrect signals to the cruise control system, causing it to stop working.
- Blown Fuse: A blown fuse in the cruise control circuit can prevent the system from functioning. Checking and replacing the fuse is a simple first step.
- Clutch Pedal Switch (Manual Transmission): For manual transmission models, a faulty clutch pedal switch can disable the cruise control system.
- Speed Sensor Issues: The cruise control relies on the vehicle’s speed sensor to maintain a consistent speed. If the sensor is damaged or malfunctioning, the system may not work properly.
- Vacuum Leaks (Older Models): In older Subaru Legacy models with vacuum-operated cruise control, a vacuum leak can cause the system to fail.
- Check Engine Light: If your Subaru Legacy’s check engine light is on, the cruise control system may be disabled as a safety precaution. This could indicate a broader issue with the engine or emissions system.
Steps to Diagnose and Fix the Problem
If your Subaru Legacy’s cruise control isn’t working, follow these steps to diagnose and potentially fix the issue:
- Step 1: Check the Brake Lights: Verify that your brake lights are functioning properly. If they’re not, the brake light switch may need to be replaced.
- Step 2: Inspect the Fuses: Locate the fuse box and check the fuse for the cruise control system. Replace it if it’s blown.
- Step 3: Scan for Error Codes: Use an OBD-II scanner to check for error codes. This can help identify issues with the speed sensor, engine, or other components.
- Step 4: Examine the Clutch or Brake Pedal Switch: If you have a manual transmission, inspect the clutch pedal switch. For automatic transmissions, check the brake pedal switch.
- Step 5: Look for Vacuum Leaks: For older models, inspect the vacuum lines for cracks or leaks and replace them if necessary.
- Step 6: Consult a Professional: If you’re unable to identify or fix the problem, it’s best to bring your vehicle to a trusted auto repair shop for a thorough diagnosis and repair.
When to Seek Professional Help
While some cruise control issues can be resolved with basic troubleshooting, others may require advanced tools and expertise. If you’ve tried the steps above and your cruise control still isn’t working, it’s time to consult a professional mechanic. At Kevin’s Autos, we specialize in diagnosing and repairing cruise control systems, ensuring your Subaru Legacy is back on the road with all its features functioning properly.
Don’t hesitate to contact us for assistance. Our experienced team is here to help with all your auto repair needs!
Frequently Asked Questions
How much does it cost to fix cruise control?
The average cost for a Cruise Control Module Replacement is between $630 and $643. Labor costs are estimated between $50 and $63 while parts are typically priced around $581. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
Why is my Subaru cruise control not working?
If it's blown, you could try replacing the fuse and testing the cruise control. That could be enough to have you cruising in comfort once again! If not, it could be because of a faulty speed sensor. If your speedometer is also acting up, this is a likely culprit.
Is it expensive to fix cruise control?
The average cost for a Cruise Control Module Replacement is between $630 and $643. Labor costs are estimated between $50 and $63 while parts are typically priced around $581. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
How do I know if my cruise control fuse is blown?
Probe the back side of each fuse. There are two places on the back side of each fuse to probe; if the test light does not light on both sides of the fuse you will find that the fuse is most likely blown.
How to reset cruise control?
If you notice that your speed fluctuates after setting it, your system may be malfunctioning. To determine if you have a problem, try resetting the system. To do this, turn the cruise control off by disengaging the switch in your car. Next, turn the system on again, set a speed, and reapply cruise control.
What are the symptoms of a blown fuse?
The most likely blown car fuse symptoms are related to electrical functions not working at all. That's almost always one specific system affected, with acute signs like: Power door locks not cycling. One or more power windows not going up or down.
What does it cost to fix cruise control?
The average cost for a Cruise Control Module Replacement is between $630 and $643. Labor costs are estimated between $50 and $63 while parts are typically priced around $581. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
What is the main cause of cruise control not working?
The speed sensor is broken.
These include regulating the fuel flow and ignition timing, indicating the speed that your car is travelling, and operating the cruise control system. If the speed sensor stops functioning properly, the cruise control will stop working.
What sensor controls cruise control?
Speed and distance sensors.
ACC uses information from two sensors: a distance sensor that monitors the gap to the car ahead and a speed sensor that automatically accelerates and decelerates your car. ACC uses information from these sensors to adjust your speed and maintain the set distance from the car in front of you.
Can a blown fuse cause cruise control to stop working?
Common causes for your vehicle's cruise control to not work include: Bad Fuse - Common cause of failed cruise control system. When the fuse of the cruise control blows, the cruise control will stop working altogether.
