Experiencing a check engine light (CEL) alongside a flashing cruise control light in your Subaru WRX can be concerning. This combination typically indicates that the vehicle's Engine Control Unit (ECU) has detected a problem that needs attention.

Causes of Check Engine Light and Flashing Cruise Control

The simultaneous occurrence of these warning lights can stem from various issues, including:

  • Loose or Missing Gas Cap: One of the most common reasons for this alert is a loose or missing gas cap. This can lead to fuel evaporation and trigger the CEL while also causing the cruise control light to flash.

  • Engine Misfire: A misfire in one or more cylinders can cause the ECU to enter "limp mode," which is a protective measure that limits engine performance to prevent further damage. This is often signaled by both lights turning on.

  • Neutral Safety Switch Issues: In some models, problems with the neutral safety switch can also trigger these warning lights. This switch ensures the vehicle can only start in neutral or park, and faults here can lead to unexpected behavior.

  • Exhaust System Problems: Issues such as a faulty catalytic converter or exhaust leaks can also cause the check engine light to illuminate while affecting cruise control functionality.

Immediate Actions to Take

If you find yourself in this situation, consider the following steps:

1. Check the Gas Cap: Ensure that your gas cap is secure. If it’s missing or loose, replace it and see if the lights turn off after driving for a while.

2. Read Diagnostic Codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the ECU. This will help identify the specific issue causing the warning lights.

3. Inspect for Misfires: If you suspect a misfire, check ignition components such as spark plugs and coils, as these are common culprits.

4. Visit a Mechanic: If the issue persists after checking these items, it’s advisable to take your vehicle to a certified mechanic or Subaru dealer for further diagnosis and repair.

Understanding Limp Mode

When both lights are activated, your WRX may enter "limp mode." This mode limits engine power and performance to protect against potential damage. It’s crucial to address the underlying issue promptly to avoid further complications.

FAQs About Subaru WRX Warning Lights

    • What does it mean if my cruise control light is flashing?
      A flashing cruise control light typically indicates an issue with the engine or transmission that needs immediate attention.
    • Can I drive my WRX with these warning lights on?
      While you may be able to drive short distances, it's not recommended as it could lead to further damage.
    • How do I reset the check engine light?
      You can reset it by disconnecting the battery for about 10 minutes; however, it's best to address the root cause first.