What remote start does and how it works

Remote start is a system that lets you start your car's engine from outside the vehicle, usually from 100 to 1,000 feet away, using a key fob or smartphone app. When you press the remote start button, a signal travels to a receiver installed in your car, which triggers the starter motor and fuel pump without requiring you to be in the driver's seat or turn the ignition key.

The system is designed to warm up or cool down your car before you get in — useful in cold climates where you want the engine running and the cabin heated before you drive, or in hot climates where you want the air conditioning running first. Some systems also unlock the doors automatically when you approach, or lock them when you walk away.

Remote start comes in two main forms: factory-installed, built into the car by the manufacturer and integrated with the vehicle's computer systems, and aftermarket, added by a third party after purchase. Factory systems are usually more reliable and integrated with other car functions, while aftermarket systems are cheaper but require professional installation and may not work with all vehicle models.

Key Takeaways

  • Remote start requires either a factory system from the manufacturer or an aftermarket unit installed by a professional, and costs range widely depending on which route you choose.
  • The system works by sending a wireless signal from your key fob or phone to a receiver in the car, which starts the engine without you being inside.
  • Most remote start systems have safety limits built in — the engine shuts off after 10 to 20 minutes if you don't get in the car, and the car won't shift into gear without the brake pedal pressed.
  • Aftermarket remote start may not work with newer vehicles that have push-button ignition or advanced security systems, so compatibility should be checked before installation.
  • Insurance and warranty coverage for remote start varies by insurer and manufacturer, so you should confirm what is and isn't covered before installation.

Factory remote start versus aftermarket systems

Factory remote start comes standard or as an option on most new vehicles sold today. It is built into the car's electrical and computer systems from the factory, so it works seamlessly with push-button ignition, keyless entry, and other modern features. If your car has factory remote start, you typically control it through your key fob or through a smartphone app provided by the manufacturer — brands like GM OnStar, Ford Pass, BMW Connected Drive, and Tesla's app all offer this.

Aftermarket remote start is installed after you buy the car, usually by a car alarm shop, electronics retailer, or independent installer. It is cheaper than factory options in some cases, but it requires the installer to wire a receiver module into your car's electrical system and program it to work with your specific make and model. Aftermarket systems work best on older vehicles with traditional key ignition; they often struggle with newer cars that have push-button starts, immobilizers, or encrypted security systems.

The main trade-off is convenience versus cost. Factory systems are more expensive upfront — sometimes $300 to $1,500 depending on the brand and features — but they integrate cleanly with your car's other systems and are covered under warranty. Aftermarket systems can cost $200 to $800 installed, but they may void your warranty, require more maintenance, and may not work reliably if your car's security system is updated or if you trade the car in.

How to control remote start on your car

If your car has factory remote start, the control method depends on the manufacturer. Most provide a key fob with a dedicated remote start button — usually marked with a curved arrow or engine symbol — that you press and hold for a few seconds to start the engine. Some fobs have a range of 300 to 1,000 feet depending on the brand and local radio interference.

Many newer vehicles also offer smartphone control through the manufacturer's mobile app. You read the app, create an account, and link it to your vehicle using your VIN (vehicle identification number) and login credentials. Once linked, you can start the car from anywhere with a cellular signal — not just line-of-sight range. Apps like GM's OnStar, Ford Pass, and Hyundai's Bluelink all offer this feature, though some require a paid subscription after a trial period.

Aftermarket systems typically use only a key fob, since smartphone integration requires access to the car's computer systems that third-party installers usually cannot reach. Some newer aftermarket systems do offer app control through a separate module, but this is less common and may require additional hardware and subscription fees.

Safety limits and automatic shutoff

Remote start systems include built-in safety features to prevent damage to the engine or the car. The most important is automatic shutoff: if you do not get in the car and press the brake pedal within a set time — usually 10 to 20 minutes — the engine shuts off automatically. This prevents the engine from running unattended for hours, which wastes fuel and can overheat the engine.

Another safety feature is shift lock: even if the engine is running via remote start, the car will not shift out of Park unless you are in the driver's seat with your foot on the brake pedal. This prevents the car from rolling away if someone accidentally bumps the gear shift or if a child gets into the car while it is running remotely.

Some systems also include geofencing, which means the remote start will not work if the car is moving or if the doors are unlocked. This prevents someone from starting your car while you are driving it or while a door is open. Factory systems are more likely to have these features than aftermarket ones, which is one reason they are considered safer.

Compatibility with different vehicle types

Remote start works with most gasoline-powered cars, trucks, and SUVs, but compatibility depends on the vehicle's age, ignition type, and security system. Older vehicles with traditional key ignition are easiest to retrofit with aftermarket remote start. Newer vehicles with push-button ignition and encrypted security systems are much harder, because the aftermarket installer cannot easily bypass the security features without risking damage to the car's computer.

Hybrid and electric vehicles present special challenges. Hybrids can have remote start, but the system must be programmed to account for the hybrid's dual power sources. Full electric vehicles like Tesla, Chevrolet Bolt, and Nissan Leaf do not need remote start in the traditional sense — you can preheat or cool the cabin through the smartphone app without starting an engine — but some owners add remote start to lock or unlock doors remotely.

Before you buy an aftermarket remote start system, check with the installer whether it is compatible with your specific vehicle year, make, and model. Many installers maintain a compatibility database and can tell you in advance whether the system will work. If your car is newer than 2015 or has a push-button start, ask the installer about any limitations or risks to your warranty.

Cost and installation considerations

Factory remote start costs vary by manufacturer and trim level. If you are buying a new car, it is usually a $300 to $1,500 option at purchase, depending on the brand. If you already own a car without remote start, you cannot retrofit factory remote start — you can only add it through an aftermarket system.

Aftermarket remote start installation typically costs $200 to $800 total, including parts and labor. The price depends on the complexity of your car's electrical system, the quality of the remote start unit, and the installer's rates. A straightforward installation on an older car might cost $300; a complex installation on a newer car with advanced security might cost $600 or more. Some retailers like Best Buy offer installation services, as do independent car alarm shops.

Before installation, confirm whether adding remote start will void your car's warranty. Many manufacturers allow aftermarket remote start as long as it does not damage the vehicle's computer or electrical systems, but some have restrictions. Read your warranty documents or call your dealer to ask. Also ask the installer about warranty on the remote start unit itself — most offer one to three years of coverage on parts and labor.

Insurance and warranty coverage

Remote start does not usually affect your car insurance rates or coverage. Your collision and comprehensive coverage will still cover damage to the car whether the engine was started remotely or manually. However, if remote start is used in a way that causes damage — for example, if someone steals your car by using your key fob to start it remotely — your insurance may investigate whether you left the fob unattended or failed to find it properly.

Warranty coverage for remote start depends on whether it is factory or aftermarket. Factory remote start is covered under your car's standard warranty for the same period as the rest of the vehicle — usually three years or 36,000 miles. Aftermarket remote start is typically covered by the installer or the manufacturer of the remote start unit, not by your car's warranty. If the remote start unit fails, you would contact the installer or the unit's manufacturer for repair or replacement.

If the remote start installation damages your car's electrical system or computer, your car's warranty may not cover the repair, since the damage was caused by a third party. This is why it is important to use a reputable installer and to get a written warranty on the installation work itself. Ask the installer whether they carry liability insurance in case something goes wrong during installation.

Frequently Asked Questions

Can I add remote start to a car that doesn't have it?

Yes, but it depends on your car's age and type of ignition. Older cars with traditional key ignition can usually have aftermarket remote start installed by a professional. Newer cars with push-button ignition and advanced security systems are much harder to retrofit and may not be compatible. Ask an installer to check your specific vehicle before you commit to the purchase.

Will remote start drain my car battery?

Remote start uses a small amount of battery power to receive the signal and start the engine, but once the engine is running, the alternator recharges the battery. The main battery drain comes from the engine running unattended for long periods. Most systems shut off automatically after 10 to 20 minutes to prevent this, so battery drain is usually not a problem if you use remote start normally.

Can someone steal my car using remote start?

Remote start alone does not unlock the doors or disable the steering wheel lock, so a thief cannot drive away with just the remote start signal. However, if a thief has your key fob or gains access to your smartphone, they could start the engine. Keep your key fob find and use a strong password on your smartphone app to prevent unauthorized access.

Does remote start work if my car is locked?

Yes. Remote start starts the engine without unlocking the doors. The car remains locked until you unlock it manually with your key fob or key, or until you approach the car if it has keyless entry. Some factory systems can be programmed to unlock the doors automatically when you start the car remotely, but this is optional and depends on your vehicle's settings.

What happens if I don't get in the car after remote start?

The engine will shut off automatically after a set time, usually 10 to 20 minutes. This is a safety feature to prevent the engine from running unattended for hours. If you want to keep the engine running longer, you must get in the car and press the brake pedal, which disables the automatic shutoff and lets you drive normally.