subaru cruise control flashing check engine light

Experiencing a flashing cruise control light alongside a check engine light in your Subaru can be concerning. This issue can indicate several underlying problems that may affect your vehicle's performance and safety. In this comprehensive guide, we will explore the reasons behind this warning, how to diagnose the issue, and what steps you can take to resolve it. Whether you're a seasoned Subaru owner or new to the brand, understanding these warning signals can help you maintain your vehicle effectively.

Understanding the Cruise Control System in Subaru Vehicles

The cruise control system in Subaru vehicles is designed to maintain a steady speed without requiring the driver to keep their foot on the accelerator. This feature is particularly useful for long highway drives, helping to reduce fatigue and improve fuel efficiency. However, when the cruise control light begins to flash, it often indicates that the system is not functioning correctly.

How the Cruise Control System Works

Subaru's cruise control system utilizes various sensors and electronic components to monitor vehicle speed and maintain it at a set level. When activated, the system takes over the throttle control, allowing the vehicle to coast at a constant speed. The system is designed to disengage automatically if it detects any issues, such as a malfunctioning sensor or a problem with the engine.

Common Causes of Flashing Cruise Control Light

A flashing cruise control light is often a sign that the system has detected a malfunction. Here are some common causes:

Engine Problems: A malfunctioning engine can cause the cruise control system to disengage. This could be due to issues like poor fuel quality, a clogged fuel filter, or engine misfires.
Faulty Sensors: The cruise control system relies on various sensors, such as the throttle position sensor and vehicle speed sensor. If any of these sensors fail, the system may not function correctly.
Transmission Issues: Problems with the transmission can also affect the cruise control system. If the transmission is slipping or has low fluid levels, it may cause the cruise control light to flash.
Electrical Problems: Wiring issues or a failing battery can disrupt the cruise control system’s operation, leading to a flashing light.

Check Engine Light: What Does It Mean?

The check engine light is another critical warning that should not be ignored. It can indicate a wide range of issues, from minor to severe. When the check engine light illuminates alongside the flashing cruise control light, it often signifies a more serious problem that requires immediate attention.

Common Reasons for the Check Engine Light to Illuminate

Understanding the potential reasons for the check engine light can help you address the issue promptly. Here are some common triggers:

Loose or Damaged Gas Cap: A loose or cracked gas cap can cause fuel vapor to leak, triggering the check engine light.
Oxygen Sensor Failure: The oxygen sensor monitors the exhaust gases and helps the engine control module adjust the air-fuel mixture. A faulty sensor can lead to poor fuel economy and increased emissions.
Catalytic Converter Issues: A failing catalytic converter can significantly impact vehicle performance and may lead to engine damage if not addressed.
Ignition System Problems: Issues with spark plugs, ignition coils, or wiring can cause misfires, triggering the check engine light.

Why a Flashing Cruise Control Light and Check Engine Light Together are Concerning

When both the cruise control light and check engine light are flashing, it indicates that the vehicle's onboard diagnostics system has detected a critical issue that could affect the engine's performance and safety. Ignoring these warnings could lead to more severe damage and costly repairs.

Potential Risks of Ignoring the Warning Lights

Ignoring the flashing cruise control light and check engine light can have several consequences:

Decreased Performance: Your vehicle may experience reduced power, acceleration, and fuel efficiency.
Increased Emissions: A malfunctioning engine can lead to higher emissions, which may cause your vehicle to fail an emissions test.
Safety Hazards: Issues with the engine or transmission can lead to dangerous driving conditions, increasing the risk of accidents.

Diagnosing the Issue: Steps to Take

If you notice a flashing cruise control light and a check engine light, it’s essential to diagnose the issue as soon as possible. Here are the steps you can take:

1. Check for Diagnostic Trouble Codes (DTCs)

The first step in diagnosing the problem is to check for any diagnostic trouble codes (DTCs) using an OBD-II scanner. These codes provide insight into what might be wrong with your vehicle. Many auto parts stores offer free scanning services, or you can purchase an OBD-II scanner for personal use.

2. Inspect the Gas Cap

A loose or damaged gas cap is a common issue that can trigger the check engine light. Inspect the cap for any cracks or damage and ensure it is securely tightened.

3. Examine the Engine Compartment

Open the hood and visually inspect the engine compartment for any obvious signs of trouble, such as loose wires, damaged hoses, or fluid leaks. Pay particular attention to the throttle position sensor and other relevant components.

4. Check Fluid Levels

Low fluid levels can lead to various issues, including problems with the transmission and engine. Ensure that your oil, coolant, and transmission fluid levels are within the recommended range.

When to Seek Professional Help

While some minor issues can be addressed at home, others require the expertise of a professional mechanic. If you're unable to diagnose the issue or if the problem persists after taking initial steps, it’s best to seek professional help.

Choosing the Right Mechanic

Finding a reputable mechanic is crucial for ensuring your vehicle gets the care it needs. Consider the following when choosing a mechanic:

Certifications: Look for mechanics who are ASE certified or have specific training in Subaru vehicles.
Reviews and Recommendations: Check online reviews and ask for recommendations from friends or family.
Warranty and Guarantees: Ensure that the mechanic offers warranties on their work and parts.

Preventative Maintenance Tips

Preventing issues with the cruise control system and check engine light can save you time and money in the long run. Here are some tips to keep your Subaru running smoothly:

1. Regularly Scheduled Maintenance

Adhering to the manufacturer's recommended maintenance schedule is vital for keeping your vehicle in top condition. Regular oil changes, fluid checks, and inspections can help prevent problems before they arise.

2. Use Quality Parts and Fluids

When replacing parts or fluids, always opt for high-quality products that meet or exceed OEM specifications. This can help ensure optimal performance and longevity.

3. Stay Informed

Stay informed about any recalls or common issues related to your specific Subaru model. Joining online forums or communities can provide valuable insights and tips from other Subaru owners.

Conclusion

Experiencing a flashing cruise control light alongside a check engine light in your Subaru can be alarming, but understanding the potential causes and solutions can help you address the issue effectively. Remember to take the necessary diagnostic steps and seek professional help when needed. By staying proactive about your vehicle’s maintenance, you can ensure a safe and enjoyable driving experience.

If you found this guide helpful, consider sharing it with other Subaru owners who might be facing similar issues. For more information on Subaru maintenance and troubleshooting, visit Subaru's official website or check out Edmunds Car Maintenance for additional resources.