Subaru Check Engine Cruise Control Flashing

Experiencing a flashing check engine light along with your cruise control light can be quite alarming for Subaru owners. This article will delve into the potential causes of these warning lights, what they mean, and how to address them effectively. Understanding these indicators is crucial for maintaining your vehicle's performance and ensuring your safety on the road.

Understanding the Check Engine Light in Your Subaru

The check engine light (CEL) in your Subaru is part of the On-Board Diagnostics II (OBD-II) system, which monitors various engine components and systems. When the CEL illuminates or flashes, it indicates that the vehicle's computer has detected a problem that requires attention. A flashing check engine light, in particular, signifies a more severe issue, often related to engine misfires or other critical malfunctions.

What Causes the Check Engine Light to Flash?

There are several reasons why the check engine light may flash in your Subaru. Here are some of the most common causes:

• Engine Misfire: A misfire occurs when the air-fuel mixture in the engine does not ignite correctly. This can lead to unburned fuel entering the exhaust system, causing damage to the catalytic converter.
• Faulty Spark Plugs or Ignition Coils: Worn or damaged spark plugs or ignition coils can lead to misfires, triggering the check engine light.
• Fuel System Issues: Problems with fuel injectors or fuel pumps can disrupt the air-fuel mixture, leading to poor engine performance and a flashing light.
• Exhaust System Problems: Issues such as a blocked catalytic converter can also cause the check engine light to flash.
• Sensor Malfunctions: Various sensors, including the oxygen sensor or mass airflow sensor, play critical roles in engine performance. If they fail, it can trigger the CEL.

The Role of Cruise Control in Subaru Vehicles

Cruise control is a convenient feature that allows drivers to maintain a steady speed without having to keep their foot on the accelerator. In Subaru vehicles, the cruise control system is closely linked to the engine's performance and can be affected by various factors that trigger the check engine light.

Why Does the Cruise Control Light Flash Alongside the Check Engine Light?

When the check engine light flashes, the cruise control system may deactivate as a safety precaution. This is because if the engine is experiencing issues, maintaining a constant speed could exacerbate the problem. Therefore, if you notice both lights flashing, it’s essential to take the situation seriously.

What to Do When You See a Flashing Check Engine and Cruise Control Light

Seeing both lights flash can be concerning, but it's important to stay calm and take the appropriate steps to diagnose and resolve the issue. Here are some recommended actions:

1. Pull Over Safely

If you are driving when the lights begin to flash, find a safe place to pull over. Continuing to drive with a flashing check engine light can lead to severe engine damage, especially if the issue is related to misfires.

2. Check for Obvious Issues

Before seeking professional help, check for any visible problems under the hood, such as loose or disconnected hoses, leaks, or damaged wiring. While you may not be able to diagnose the problem yourself, identifying any obvious issues can help a mechanic narrow down the cause.

3. Use an OBD-II Scanner

If you have access to an OBD-II scanner, you can retrieve the diagnostic trouble codes (DTCs) from your vehicle. These codes can provide insight into what might be causing the lights to flash. Many auto parts stores offer free scanning services, or you can purchase a scanner for personal use.

4. Consult a Professional Mechanic

If the lights continue to flash after you’ve checked for obvious issues or if you’ve retrieved DTCs that you don’t understand, it’s time to consult a professional mechanic. They can perform a thorough diagnosis and determine the root cause of the problem.

Common Diagnoses for Flashing Check Engine and Cruise Control Lights

When you take your Subaru to a mechanic, they may perform a series of tests and inspections to identify the underlying issue. Here are some common diagnoses that could be made:

1. Ignition System Problems

As mentioned earlier, faulty spark plugs or ignition coils are common culprits for engine misfires. Mechanics will check these components first to ensure they are functioning correctly.

2. Fuel System Issues

Mechanics will inspect the fuel system, including fuel injectors and the fuel pump, to determine if they are delivering the right amount of fuel to the engine. Any blockages or failures can lead to performance issues.

3. Exhaust System Inspection

A blocked catalytic converter can cause back pressure in the exhaust system, leading to poor engine performance and triggering the lights. Mechanics will perform tests to check for clogs or failures in the exhaust system.

4. Sensor Failures

The O2 and mass airflow sensors are critical for maintaining the correct air-fuel mixture. Mechanics will test these sensors to ensure they are operating within the correct parameters.

Preventive Measures for Subaru Owners

While some issues may be unavoidable, there are several preventive measures that Subaru owners can take to minimize the risk of encountering a flashing check engine light and cruise control problems:

1. Regular Maintenance

Following your vehicle's maintenance schedule is crucial. Regular oil changes, air filter replacements, and inspections can help keep your engine running smoothly.

2. Monitor Fluid Levels

Ensure that your engine oil, coolant, and other fluid levels are within the recommended range. Low fluid levels can lead to overheating and other issues that may trigger warning lights.

3. Use Quality Fuel

Using high-quality fuel can help maintain engine performance and longevity. Avoid using low-grade fuel, which may contain impurities that can clog fuel injectors and damage the engine.

Conclusion

Seeing a flashing check engine light along with your cruise control light can be alarming, but understanding the potential causes and knowing how to respond can help you address the issue effectively. Remember to pull over safely, check for obvious issues, and consult a professional mechanic as needed. By taking preventive measures and maintaining your Subaru, you can help ensure a smooth and safe driving experience.

If you're experiencing these warning lights, don’t hesitate to take action. Your safety and your vehicle's performance depend on it. For more information on Subaru maintenance and troubleshooting, visit Subaru's official website or consult resources like Edmunds for expert automotive advice.

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