Why does my Subaru shut off when I stop?

If your Subaru is shutting off when you come to a stop, it could be due to an issue with the engine idling system. This is a common problem that can occur in some Subaru models, and it's often caused by a malfunctioning component or a problem with the engine's computer system.

Potential Causes of Subaru Stalling at Stops

There are several potential reasons why your Subaru might be shutting off when you stop driving:

• Idle Control Valve (ICV) Issues: The ICV is responsible for regulating the engine's idle speed. If the ICV is malfunctioning, it can cause the engine to stall when you come to a stop.


• Vacuum Leaks: Vacuum leaks in the engine's intake system can disrupt the air-fuel mixture, leading to stalling at idle. This can be caused by worn or damaged hoses, gaskets, or other components.li>
  
• Fuel System Problems: Issues with the fuel pump, fuel injectors, or fuel pressure regulator can cause the engine to stall when idling.


• Engine Computer (ECM) Malfunction: If the engine's computer is not properly controlling the engine's idle speed, it can result in the engine stalling when you stop.


• Worn or Damaged Spark Plugs: Faulty spark plugs can cause misfiring and stalling, especially at idle.

If your Subaru is consistently shutting off when you stop, it's important to have it diagnosed and repaired by a qualified mechanic to identify and address the underlying issue.

Troubleshooting and Repair Steps

To diagnose and fix the problem, a mechanic will typically follow these steps:

1. Perform a thorough inspection of the engine and its components, including the ICV, vacuum system, fuel system, and engine computer.


2. Use diagnostic tools to check for any trouble codes or other indications of a problem in the engine's computer system.


3. Test the ICV and other components to determine if they are functioning properly.


4. Check for any vacuum leaks or other issues in the intake system.


5. Inspect and potentially replace any faulty components, such as the ICV, spark plugs, or fuel system parts.


6. Reprogram or reset the engine computer if necessary to ensure proper idle speed control.

By addressing the underlying cause of the stalling issue, a qualified mechanic should be able to resolve the problem and prevent your Subaru from shutting off when you come to a stop.

Why does my Subaru stall when I come to a stop?

The top reasons why your Subaru may stall include a dirty air filter, a bad fuel pump, a faulty ignition system, clogged fuel injectors, a dirty throttle body, and a faulty mass airflow sensor. To prevent stalling, it's important to have your car regularly maintained and inspected by a professional.

How do I stop my Subaru from automatically turning off?

To stop your Subaru from automatically turning off, press the "A" with a circle icon button on your dashboard or touchscreen, which temporarily disables the feature for that drive. If you want to disable it permanently, you can either get used to pressing the button each time you start the car or purchase and install an aftermarket "auto stop eliminator" module that does it for you. 
Temporarily disable the feature 

• Locate the button: Find the button with an "A" inside a circle icon on your dashboard or center console. Some models have it on a physical panel, while others have it on the touchscreen. 
• Press the button: Press the button to turn the system off. An amber light with the same icon will appear on your dash to confirm the feature is off. 
• Note: The auto start/stop system will re-enable itself automatically the next time you turn the car off and on, so you will need to press the button again for each drive. 

Permanently disable the feature 

• Purchase an eliminator module: You can buy an aftermarket module designed to permanently disable the auto start/stop feature. 
• Install the module: The installation process typically involves removing the existing auto start/stop button and replacing it with the new module, which plugs into the existing wiring harness behind the dashboard. 
• Consider your model: Before buying, ensure the specific module is compatible with your Subaru's make, model, and year. Some kits are available from retailers like Amazon and 4D Tech, and they often have instructions and a list of compatible vehicles. 

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Why does my Subaru turn off when I stop?

Your Subaru is likely turning off when you stop due to the Auto Start/Stop system, which is a fuel-saving feature that shuts off the engine at a complete stop and restarts it when you release the brake. If this is not your intended behavior, or if the engine is shutting off unexpectedly when not at a stop, it could indicate a faulty part such as the battery, alternator, idle air control valve, or a sensor, particularly if the EyeSight system also disables. 
If this is happening as designed

• It's the Auto Start/Stop system: This is a standard feature on many newer Subarus designed to save fuel and reduce emissions by turning off the engine when you are at a standstill. 
• The system is working correctly: The engine will turn back on automatically when you take your foot off the brake. 
• You can turn it off manually: There is a button with an "A" and a circling arrow icon, often on the touchscreen, to temporarily disable the feature. The system will reactivate the next time you start the car. 

This video demonstrates how to turn off the Auto Start/Stop feature on a 2025 Subaru Forester Touring: 47sAlex PrestigiacomoYouTube · Nov 14, 2024
If it's not working as expected or is happening unexpectedly 

• Check the battery and charging system: A weak battery or a faulty alternator can prevent the engine from restarting correctly. This is a common issue and a good first thing to check. 
• Inspect the idle air control (IAC) valve: A dirty or malfunctioning IAC valve is a primary cause of stalling at idle because it can't properly regulate airflow to keep the engine from stalling. 
• Look for sensor issues: Problems with sensors, such as a faulty crankshaft position sensor, mass airflow sensor, or even the brake light switch, can cause the engine to shut down unexpectedly. 
• Consider other potential issues: Other problems could include a clogged fuel filter, faulty fuel pump, or an issue with the engine control module (PCM). 

This video explains the Subaru Auto Start/Stop system, including how to disable it: 1mAlex PrestigiacomoYouTube · Aug 28, 2024
What to do

1. Confirm if the Auto Start/Stop system is the cause: Observe your car. If the engine only turns off when you are completely stopped and comes back on when you touch the brake pedal, it is likely working as designed. If it happens at other times, or if the engine doesn't restart, it may be a fault. 
2. Temporarily disable the feature: Use the on-screen button to turn off the Auto Start/Stop system to see if the issue persists. If it doesn't turn off unexpectedly anymore, the problem is within that system, though it's still best to have any underlying fault identified. 
3. Take it to a mechanic: If the problem continues, or if it's turning off unexpectedly, it's best to have a professional inspect the vehicle to diagnose the specific component causing the problem.