How to Lock a Subaru While It’s Running

Locking your Subaru while the engine is running is possible and safe with the right steps. Whether you’re using a key fob, keyless entry, or remote start, this guide covers everything you need to know to keep your vehicle secure without turning off the engine.

Key Takeaways

• Use the key fob to lock doors remotely: Press the lock button on your Subaru key fob while the engine is running to secure all doors instantly.
• Enable keyless entry locking: On models with keyless access, simply walk away with the fob or press the door handle button to lock the car automatically.
• Remote start allows locking from a distance: Start your Subaru remotely and lock it using the fob’s lock button—ideal for pre-heating or cooling your vehicle.
• Manual locking is an option: If the fob isn’t working, use the manual lock switch inside the car or the physical key blade.
• Security features prevent theft: Subaru’s immobilizer system ensures the engine won’t restart without the correct key, even if someone breaks in.
• Always verify the lock: After locking, check that all doors and the trunk are secure by tugging on the handles.
• Avoid leaving valuables in plain sight: Even when locked, keep personal items out of view to deter break-ins.

Why You Might Want to Lock a Running Subaru

Have you ever needed to step away from your Subaru for a moment—maybe to grab something from the house or help a friend—but didn’t want to turn off the engine? Whether you’re warming up the car on a cold morning, cooling it down in summer, or just running a quick errand, leaving your Subaru running while you’re away can be convenient. But safety and security are top concerns. The good news? You can lock your Subaru while it’s running, and it’s easier than you might think.

Many Subaru owners aren’t aware that their vehicle supports this feature, especially with modern keyless entry and remote start systems. Whether you drive a 2020 Outback, a 2023 Forester, or an older Impreza, most Subaru models allow you to lock the doors while the engine remains on. This is particularly useful in extreme weather, when you want to maintain cabin temperature, or when you’re parked in a safe location and just need a quick break. However, it’s important to do it correctly to avoid accidentally locking yourself out or compromising your vehicle’s security.

Understanding Subaru’s Locking Systems

Before diving into the steps, it helps to understand how Subaru’s locking and ignition systems work. Subaru vehicles are equipped with advanced security features designed to protect both the vehicle and its occupants. These include electronic immobilizers, keyless entry systems, and remote start capabilities—all of which play a role in locking a running car.

Key Fob and Remote Functions

Your Subaru key fob is more than just a key—it’s a remote control for your vehicle. Most fobs have four main buttons: lock, unlock, trunk release, and panic alarm. The lock button is your go-to for securing the car, even when the engine is running. When you press it, the doors lock electronically, and the hazard lights usually flash once to confirm the action. Some newer models also emit a beep or display a message on the dashboard.

One common misconception is that you can’t lock the car if the engine is on. That’s not true. As long as the key fob is inside the vehicle or within range, you can lock the doors remotely. However, if the fob is outside and the engine is running, the car may not allow you to lock it via the fob for safety reasons—this prevents accidental lockouts. But there are workarounds, which we’ll cover later.

Keyless Access with Push-Button Start

If your Subaru has keyless access (also known as “Smart Key” or “Passive Entry”), you can lock the car simply by walking away with the fob in your pocket or bag. Most models automatically lock when you’re about 6–10 feet away from the vehicle. This feature uses sensors in the door handles to detect the fob’s presence. When you walk away, the system recognizes that the key is no longer nearby and triggers the lock sequence.

You can also manually lock the car by pressing the small button on the door handle. This is especially useful if you’re standing near the car and want to lock it immediately. Just press the button on any door handle, and all doors will lock. The system is designed to work even when the engine is running, so you don’t need to shut off the car to secure it.

Remote Start Capability

Many newer Subaru models come with remote start functionality, either standard or as an optional upgrade. This allows you to start the engine from up to 300 feet away using the key fob. Once the engine is running, you can lock the car remotely by pressing the lock button. This is perfect for pre-conditioning your vehicle—warming it up in winter or cooling it in summer—while keeping it secure.

To use remote start, press the lock button on your fob three times in quick succession. The engine will start, and the climate control system will activate based on your last settings. After starting, press the lock button once more to secure all doors. The car will remain running and locked until you return and unlock it with the fob.

Step-by-Step: How to Lock a Subaru While It’s Running

Now that you understand the systems at play, let’s walk through the actual process of locking your Subaru while the engine is running. The steps vary slightly depending on your model and features, but the core principles remain the same.

Method 1: Using the Key Fob

This is the most straightforward method and works on nearly all Subaru models with a key fob. Here’s how to do it:

• Start your Subaru and let the engine run.
• Ensure all passengers have exited the vehicle and the doors are closed.
• Press the lock button on your key fob. You should hear a click and see the hazard lights flash once.
• Verify that all doors are locked by gently tugging on the door handles.

This method works even if you’re inside the car. Just press the lock button on the fob, and the doors will secure. However, if you’re outside the vehicle and the engine is running, the car may not respond to the fob’s lock command if it detects the key is still inside. In that case, try the next method.

Method 2: Using Keyless Entry (Walk-Away Locking)

If your Subaru has keyless access, you can lock it simply by walking away. Here’s how:

• Start the engine and exit the vehicle, making sure the key fob is with you.
• Close all doors securely.
• Walk about 6–10 feet away from the car. The system will detect that the fob is no longer near the vehicle.
• The doors will automatically lock, usually accompanied by a beep or flashing lights.

This feature is incredibly convenient and eliminates the need to press any buttons. Just make sure the fob is in your pocket or bag—not left inside the car. If the fob is inside, the system assumes the driver is present and won’t lock the doors automatically.

Method 3: Manual Locking via Door Handle

For models with keyless entry, you can also lock the car manually by pressing the button on the door handle. Here’s the process:

• Start the engine and exit the vehicle with the key fob.
• Close all doors.
• Press the small button on any door handle (usually located near the handle’s base).
• The doors will lock immediately, and the hazard lights may flash to confirm.

This method is ideal if you’re standing near the car and want to lock it right away. It’s also useful if the automatic walk-away locking isn’t working due to interference or low fob battery.

Method 4: Using Remote Start and Lock

If your Subaru has remote start, you can start the engine and lock the car from a distance. Follow these steps:

• Stand within 300 feet of your Subaru.
• Press the lock button on your fob once to ensure the car is secure.
• Press the lock button three times quickly to activate remote start. The engine will turn on.
• Once the engine is running, press the lock button one more time to lock all doors.
• The car will remain running and locked until you return and unlock it.

This method is perfect for pre-heating or cooling your vehicle. Just remember to keep the fob with you—if you lose it, you won’t be able to turn off the engine or unlock the doors.

Method 5: Manual Lock Switch (Inside the Car)

If your key fob isn’t working—perhaps due to a dead battery—you can still lock the car manually. Most Subaru models have a manual lock switch on the driver’s side door panel. Here’s how to use it:

• Start the engine and ensure all doors are closed.
• Locate the manual lock switch on the driver’s door (usually a small lever or button).
• Press or flip the switch to lock all doors.
• Exit the vehicle and verify the lock by tugging on the handles.

This method works even without the key fob, but you’ll need the physical key blade to unlock the car later. Keep the key blade accessible in case you need it.

Safety and Security Considerations

While locking a running Subaru is convenient, it’s important to prioritize safety and security. Leaving your car running unattended can pose risks, especially in certain environments. Here are some key considerations to keep in mind.

Avoid Leaving the Car Unattended in High-Risk Areas

Even with advanced locking systems, it’s not advisable to leave your Subaru running and unattended in high-crime areas, busy parking lots, or isolated locations. Thieves can exploit vulnerabilities, such as signal amplification attacks on keyless entry systems. If you must leave the car running, choose a secure, well-lit location and keep the fob with you at all times.

Use the Immobilizer System to Your Advantage

Subaru vehicles are equipped with an electronic immobilizer that prevents the engine from starting without the correct key. This means that even if someone breaks a window and gets inside, they won’t be able to drive away unless they have the key fob. This built-in security feature adds an extra layer of protection when your car is locked and running.

Keep the Key Fob Secure

The key fob is the most important part of your Subaru’s security system. If it’s lost or stolen, a thief could potentially start and drive your car. To prevent this, always keep the fob in a secure location—preferably on your person or in a Faraday pouch, which blocks radio signals and prevents relay attacks. Some Subaru owners also use key fob covers or disable the fob’s signal when not in use.

Monitor the Engine and Fuel Levels

Leaving your Subaru running for extended periods can drain the battery or consume fuel unnecessarily. Most modern Subarus will automatically shut off the engine after a certain time (usually 15–30 minutes) to prevent this. However, it’s still a good idea to monitor the situation and return to the vehicle promptly. If you’re using remote start, check the fuel gauge before leaving the car running for too long.

Be Mindful of Carbon Monoxide in Enclosed Spaces

Never leave your Subaru running in an enclosed space like a garage, even with the door open. Exhaust fumes contain carbon monoxide, a colorless, odorless gas that can be deadly. Always ensure proper ventilation if you’re warming up the car indoors, or better yet, use remote start from outside the garage.

Troubleshooting Common Issues

Even with the best systems, things don’t always go as planned. Here are some common issues Subaru owners face when trying to lock a running car—and how to fix them.

Car Won’t Lock Remotely

If pressing the lock button on your fob doesn’t work, check the following:

• Fob battery: A weak battery can reduce the fob’s range. Replace the battery if the signal seems weak.
• Key inside the car: If the fob is detected inside the vehicle, the system may prevent remote locking for safety. Move the fob outside or use manual locking.
• Interference: Electronic devices or metal structures can block the fob’s signal. Try moving to a different location.

Walk-Away Locking Not Working

If your Subaru doesn’t lock automatically when you walk away, try these fixes:

• Ensure the fob is not inside the car.
• Check that keyless entry is enabled in the vehicle settings.
• Reset the system by turning the car off and on again.

Remote Start Fails to Lock

If the engine starts but the doors don’t lock, press the lock button manually after remote start. Some systems require a separate command to lock the doors. Also, ensure the fob is within range and the battery is charged.

Best Practices for Everyday Use

To make locking your Subaru while it’s running as smooth and safe as possible, follow these best practices:

• Always carry the key fob with you when exiting the vehicle.
• Test the locking system regularly to ensure it’s working properly.
• Keep the fob battery fresh—replace it every 1–2 years.
• Use remote start responsibly and only in safe, open areas.
• Never leave children or pets unattended in a running vehicle.
• Store valuables out of sight to reduce the risk of break-ins.

Conclusion

Locking your Subaru while it’s running is not only possible—it’s a smart and convenient feature that enhances both comfort and security. Whether you’re using the key fob, keyless entry, remote start, or manual switches, Subaru’s design allows you to secure your vehicle without turning off the engine. This is especially helpful in extreme weather or when you need a quick break without sacrificing cabin temperature.

By understanding your Subaru’s locking systems and following the steps outlined in this guide, you can confidently lock your car while it’s running. Just remember to prioritize safety: avoid high-risk areas, keep the fob secure, and never leave the vehicle unattended in enclosed spaces. With the right knowledge and habits, you can enjoy the convenience of a running, locked Subaru without compromising on security.

Frequently Asked Questions

Can I lock my Subaru with the engine running?

Yes, you can lock your Subaru while the engine is running using the key fob, keyless entry, or remote start. Most models support this feature for convenience and safety.

Will my Subaru lock automatically if I walk away with the key fob?

Yes, if your Subaru has keyless access, it will automatically lock when you walk about 6–10 feet away with the fob. The system detects the fob’s absence and triggers the lock.

Can I use remote start to lock my Subaru?

Absolutely. Start the engine remotely by pressing the lock button three times, then press it once more to lock all doors. The car will remain running and secure.

What if my key fob battery is dead?

If the fob battery is dead, use the manual lock switch inside the car or the physical key blade to lock the doors. Replace the fob battery as soon as possible.

Is it safe to leave my Subaru running and locked?

It’s generally safe in secure, well-lit areas, but avoid high-crime locations. Always keep the fob with you and never leave the car in an enclosed space like a garage.

Why won’t my Subaru lock when the engine is running?

This may happen if the key fob is detected inside the car or if the battery is weak. Move the fob outside or replace the battery to resolve the issue.