What Your Subaru Remote Start Key Fob Does
A Subaru remote start key fob lets you start your engine from outside the vehicle using a button on your key remote. On most Subaru models, you press and hold the dedicated remote start button (usually marked with a curved arrow or engine symbol) for three seconds, and the engine turns on. The car will run for a set time — typically 10 to 15 minutes — then shut off automatically if you don't get inside and press the brake pedal.
Remote start works only when your doors are locked and the key fob is in range, usually 80 to 100 feet away depending on the model year and any radio interference in your area. The feature is designed for warming up the engine in cold weather or cooling the cabin in summer heat before you drive.
Key Takeaways
- Remote start activates by holding the dedicated button on your key fob for three seconds; the engine runs for 10 to 15 minutes then shuts off automatically.
- Your doors must be locked and the key fob must be within 80 to 100 feet of the vehicle for remote start to work.
- If remote start does not respond, check the key fob battery first, then verify that the doors are actually locked and the parking brake is set.
- Some Subaru models require the feature to be turned on in the vehicle settings before the key fob button will work.
- If your key fob is damaged or the battery is dead, you will need a replacement fob or new battery from a Subaru dealer or automotive locksmith.
How to set up Remote Start on Your Subaru
Locate the remote start button on your key fob. On most Subaru remotes, it is a separate button with a curved arrow or engine icon, distinct from the lock and unlock buttons. Press and hold this button for three seconds. You should see the parking lights flash and hear the engine start.
If nothing happens, check that all doors are locked — remote start will not work if any door is unlocked. Also verify that the parking brake is set. Some Subaru models will not start remotely if the brake is not engaged. If both conditions are met and the fob still does not respond, the battery in your key fob may be dead.
Once the engine is running, you have 10 to 15 minutes before it shuts off on its own. If you want to drive the vehicle, get inside, close the door, and press the brake pedal. The engine will stay running. If you do nothing, the engine will turn off and the doors will lock automatically.
Checking and Replacing Your Key Fob Battery
A dead or dying key fob battery is the most common reason remote start stops working. To check the battery, look at the back of your key fob for a small slot or seam. Use a coin or flat tool to gently pry open the fob case. Most Subaru fobs use a CR2032 or CR2025 coin-cell battery, which you can see once the case is open.
Note which side of the battery faces outward — the positive side usually faces up. Remove the old battery and replace it with a new one of the same type, making sure the positive side faces the same direction. Close the fob case until it clicks. Test the remote start button to confirm it works.
If you are uncomfortable opening the fob yourself, a Subaru dealer or automotive locksmith can replace the battery for a small fee, usually between $10 and $25. They can also test the fob to rule out other problems.
Why Remote Start May Not Be Working
Dead key fob battery: This is the first thing to check. If the battery is low, the fob may still lock and unlock the doors but lack enough power for remote start, which requires more energy.
Doors not locked: Remote start will not set up if any door is unlocked. Walk around the vehicle and confirm all doors are closed and locked before trying again.
Parking brake not set: Many Subaru models require the parking brake to be engaged for remote start to work. Set the brake and try again.
Key fob out of range: If you are more than 100 feet from the vehicle or there is heavy radio interference (such as near power lines or a radio tower), the signal may not reach. Move closer to the vehicle and try again.
Remote start disabled in settings: Some Subaru model years allow you to turn remote start on or off through the vehicle's infotainment system. Check your owner's manual for the exact menu path. If remote start is turned off, you will need to turn it back on in the vehicle settings.
Damaged key fob: If the fob has been dropped, sat on, or exposed to water, the internal circuitry may be damaged. A replacement fob from a Subaru dealer or locksmith is usually the only fix.
How to Enable Remote Start in Your Vehicle Settings
On newer Subaru models, remote start can be turned on or off through the vehicle's touchscreen or steering wheel controls. Start the engine normally and navigate to the Settings menu on your infotainment display. Look for an option labeled "Remote Engine Start," "Remote Start," or "Key Fob Settings."
The exact path varies by model year and infotainment system. Consult your owner's manual for the precise steps for your vehicle. Once you find the setting, select the option to turn remote start on. Exit the menu and test the key fob button. If remote start is already turned on and the fob still does not work, the problem is likely a dead battery or a damaged fob.
Getting a Replacement Key Fob
If your key fob is damaged beyond repair or the battery replacement did not fix the problem, you will need a new fob. A Subaru dealership can order a replacement and program it to your vehicle. Bring your vehicle keys and proof of ownership. The dealer will cut and program the new fob, a process that usually takes 30 minutes to an hour. Cost varies by model but typically ranges from $200 to $400 for a new fob with remote start capability.
An automotive locksmith can often provide a replacement fob at a lower cost than a dealership, sometimes $100 to $250, depending on your model year. However, not all locksmiths can program Subaru fobs, so call ahead to confirm they service your model. If you choose a locksmith, bring your vehicle and proof of ownership so they can program the fob on-site.
Frequently Asked Questions
Can I remote start my Subaru if the windows are down?
Yes. Remote start does not require the windows to be closed. However, if the windows are down and the doors are locked, the cabin will not heat or cool as efficiently. For best results, close the windows before locking the doors.
Does remote start drain my battery?
Remote start uses some battery power, but not enough to drain a healthy battery in normal use. If you remote start your vehicle every day for weeks without driving it, the battery may eventually run low. For occasional use, battery drain is not a concern.
What happens if I remote start the car but never get in?
The engine will run for 10 to 15 minutes, then shut off automatically and lock all doors. The vehicle will return to its locked, off state. No damage occurs if you let the timer run out.
Can I remote start my Subaru if the key fob is inside the vehicle?
No. The key fob must be outside the vehicle and within range for remote start to work. If the fob is inside, the system will not set up.
Does my Subaru have remote start if I did not get it as an option?
Remote start is an optional feature on most Subaru models. If your vehicle did not come with a remote start key fob, you cannot add it later through a software update. You would need to purchase an aftermarket remote start system, which requires professional installation.