How are some vehicles with smart keys stolen, and what can you do to protect yours?

Introduction

If you have ever searched the Internet for information about smart keys, you have probably come across videos claiming that any modern vehicle can be opened within seconds using an electronic device. In other cases, you may have seen advertisements promising to program a smart key for a fraction of the price charged by a dealership, or posts claiming that devices such as the Flipper Zero can steal any vehicle with the push of a button.

The reality is very different.

In recent years, social media has become filled with incomplete information, videos edited to generate thousands of views, and advice that, although it may sound convincing, does not always reflect how the security systems of modern vehicles actually work.

As a result, many vehicle owners have completely valid questions.

Is my Push Start vehicle easier to steal?

Can someone copy the signal from my key while it is inside my house?

Do I really need a Faraday pouch?

Can anyone program a Smart Key?

How much of what appears on TikTok, Facebook, or YouTube is actually true?

At AsistenciaEnLaCarretera.com, we receive these types of questions frequently. Every day, we assist people who have lost the only key to their vehicle, need to program a Smart Key, require a vehicle to be unlocked without causing damage, or simply want to better understand how to protect their investment.

That Is Precisely Why We Decided to Prepare This Guide

Our goal is not to create fear or make people believe that every vehicle is at risk. Nor do we intend to claim that one brand is better than another or that there is a security system that is impossible to compromise.

Our purpose is much simpler: to provide clear, responsible, reality-based information about how smart keys work, the security technologies used by vehicle manufacturers, the types of attacks that have been documented worldwide, and the practical steps any driver can take to reduce risk.

We also want to provide guidance to those who need to hire an automotive locksmith service.

In Puerto Rico, as in many other parts of the world, people regularly advertise smart key programming, Smart Key duplication, and automotive locksmith services through Facebook Marketplace, social media, and classified advertisements.

Many of them perform honest and professional work. However, there are also individuals who simply purchase programming equipment online and begin offering specialized services without the technical training, experience, or knowledge required to work with the electronic systems of a modern vehicle.

Today, programming a smart key involves much more than cutting a key or connecting a machine to a vehicle. Depending on the make and model, the procedure may require professional equipment, updated software, knowledge of electronic immobilizers, security protocols, and experience to avoid damage that could result in costly repairs.

For that reason, choosing the right person to work on your vehicle is just as important as understanding the basic measures you can take to protect it.

Throughout this guide, you will find information about the evolution of automotive keys, the different security systems used by manufacturers, and concepts such as Rolling Codes, Relay Attack, Clone Key, OBD Port, Flipper Zero, Ultra Wideband (UWB), and many other technologies that are now part of the world of automotive security.

Our commitment is to help you understand how this technology actually works so that you can better protect your vehicle, recognize the difference between fact and myth, and make more informed decisions whenever you need assistance related to your vehicle’s keys or security systems.

Welcome to the most comprehensive automotive security guide we have prepared for our customers.

The Evolution of Automotive Security

For many years, vehicle security depended almost entirely on a mechanical key. The system was simple: if the key had the correct cut, the lock would turn and the engine could be started. At that time, most vehicle thefts involved forcing a door open, breaking a window, or manipulating the ignition system.

Over time, manufacturers began developing new systems to make these types of crimes more difficult. The introduction of electronic components made it possible to add a second layer of security that went far beyond a simple mechanical lock.

Today, a modern vehicle may contain dozens of electronic modules that communicate with one another to continuously verify that the correct key is being used before allowing the engine to start.

This evolution did not happen overnight. It has been the result of decades of technological development, with each new generation of vehicles incorporating increasingly sophisticated mechanisms designed to protect both the vehicle and its occupants.

From the Mechanical Key to the Smart Key

Most people remember when the only purpose of a car key was to open the door and start the vehicle. Those keys were entirely mechanical. They had no battery, transmitted no electronic signals, and stored no digital information. If someone managed to copy the metal cuts of the key, they essentially had a functional duplicate.

As vehicle theft increased during the 1980s and 1990s, manufacturers realized that a mechanical key no longer provided the level of protection consumers needed. That marked the beginning of a new era in the automotive industry.

First Generation: Mechanical Keys

The first keys used in automobiles operated exclusively through mechanical components. Their security depended entirely on the internal design of the lock.

Although they provided an appropriate solution for their time, tools eventually became available that could manipulate locks or produce duplicate keys with relative ease.

This forced manufacturers to search for more secure alternatives.

Second Generation: Remote-Control Keys

During the mid-1990s, remote controls integrated into vehicle keys began to become increasingly common.

For the first time, drivers could lock or unlock their doors by pressing a button without inserting the key into the lock.

Although this represented a major improvement in convenience, the real transformation in vehicle security was still to come.

Third Generation: The Birth of the Transponder

One of the most important advances in the history of automotive security was the introduction of the transponder.

At first glance, the key still looked like a traditional key, but inside it contained a small electronic chip.

That chip contained a unique code that the vehicle had to recognize before allowing the engine to start. In other words, even if someone managed to create an identical copy of the metal portion of the key, the vehicle would not start unless the transponder was recognized by the security system.

This technology significantly reduced theft using traditional methods and represented a major turning point in vehicle protection.

Fourth Generation: Smart Key and Keyless Entry

The evolution continued with the introduction of Smart Keys, also known as intelligent keys.

With these systems, it is no longer necessary to insert the key into an ignition cylinder.

You simply carry the key in your pocket, approach the vehicle, and, on many models, touch the door handle to unlock the doors.

Once inside the vehicle, the driver simply presses the Push Start button, and the vehicle electronically verifies that an authorized key is present before allowing the engine to start.

This process happens within seconds and goes virtually unnoticed by most drivers.

Automotive Security Continues to Evolve

Manufacturers continue developing new technologies to protect their vehicles.

Some brands already incorporate systems capable of measuring the actual distance between the key and the vehicle, use increasingly sophisticated encrypted communications, and periodically update the software that controls different electronic modules.

In other words, automotive security no longer depends on a key alone. Today, it is the result of multiple systems working together to prevent an unauthorized person from using the vehicle.

And precisely because technology continues to evolve, it is also important to understand the terms that frequently appear online and what they actually mean.

In the following sections, we will explain in simple terms how smart keys work, what the Keyless Entry system is, and why many of the myths circulating on social media do not accurately reflect the reality of modern vehicles.

What Is a Smart Key and How Does It Really Work?

If you purchased a relatively recent vehicle, there is a good chance that it already uses a Smart Key, or intelligent key.

Although many drivers use one every day, relatively few actually understand how it works.

Unlike a traditional key, a Smart Key does much more than open a lock. It is actually a small electronic device that communicates with the vehicle using short-range radio signals and authentication systems designed by the manufacturer.

Its primary purpose is not simply to unlock the doors, but to demonstrate to the vehicle that the person attempting to use it possesses an authorized key.

In other words, a smart key functions as an electronic access credential.

Much More Than a Key

When a person carries the Smart Key in a pocket, the vehicle remains passively “listening.”

As the person approaches the vehicle, several sensors and antennas installed throughout the vehicle detect the possible presence of an authorized key. At that point, an exchange of information begins and takes place within fractions of a second.

If the System Successfully Validates the Key’s Authenticity, It May Allow Actions Such As:

• Opening the trunk or rear hatch.
• Starting the vehicle using the Push Start button.
• Activating memory features on certain models, such as seat or mirror positions.

This entire process occurs automatically without requiring the driver to press a button.

For the user, it may seem very simple. Behind that convenience, however, a significant amount of technology is working simultaneously.

What Happens When You Press the Push Start Button?

One of the most common questions we receive is:

“If my car does not have anywhere to insert a key, how does it know that it is me?”

The answer lies in the electronic authentication system.

When you press the start button, the vehicle does not start immediately.

Before allowing the engine to start, different electronic modules verify that an authorized Smart Key is located inside the vehicle.

Only after that verification has been completed does the system release the electronic immobilizer and allow the vehicle to start.

If that validation fails, the vehicle simply will not start, even if the button is functioning correctly and the vehicle battery is in good condition.

Is the Smart Key Battery Important?

Yes.

Most smart keys use a small lithium battery to power their electronic circuits and allow communication with the vehicle.

When That Battery Begins to Lose Power, You May Notice Symptoms Such As:

• Reduced range when unlocking the doors.
• Low-key-battery messages on the dashboard.
• The need to bring the key closer to the vehicle.
• Intermittent operation of the keyless entry system.

Fortunately, a dead Smart Key battery does not necessarily mean that the key has stopped functioning completely.

Most manufacturers incorporate emergency procedures that allow the vehicle to be started even when the Smart Key battery is completely discharged.

Depending on the manufacturer, you may need to place the key near a specific location inside the vehicle or use the mechanical backup key integrated into the Smart Key itself.

For that reason, we always recommend replacing the battery when the first low-battery warning appears rather than waiting until it stops functioning entirely.

Do All Smart Keys Work the Same Way?

No.

Each manufacturer develops its own technology and uses different levels of security.

Although the general operation may be similar, important differences exist among brands such as Toyota, Honda, Ford, General Motors, Nissan, Hyundai, Kia, BMW, Mercedes-Benz, Audi, Volkswagen, and many others.

Even within the same brand, there may be significant differences between individual models or between different generations of the same vehicle.

For that reason, a tool that works to program a key for one vehicle may not be compatible with another, even if both vehicles are produced by the same manufacturer.

This is one of the reasons smart key programming requires specialized equipment, access to current technical information, and experience working with different automotive platforms.

Convenience Also Creates New Challenges

The ability to unlock a vehicle without removing the key from your pocket provides tremendous convenience for the driver.

However, as with any technological advancement, that convenience has also required manufacturers to develop new protective measures against threats that simply did not exist twenty years ago.

Terms such as Rolling Codes, Relay Attack, Ultra Wideband (UWB), and other authentication systems have emerged from this evolution and are now part of modern automotive security.

Before discussing the different types of attacks commonly mentioned online, it is important to understand one of the foundations of this technology: the system known as Rolling Code.

It is one of the primary reasons today’s smart keys provide a significantly higher level of protection than previous generations.

What Are Rolling Codes and Why Did They Make Modern Vehicles More Secure?

When the first remote controls for locking and unlocking vehicle doors appeared, their operation was relatively simple.

Each time the driver pressed a button, the key transmitted a fixed code to the vehicle.

If the vehicle received that same code, it carried out the command to lock or unlock the doors.

Although this represented a major technological advancement at the time, the system had an important weakness.

Eventually, devices became available that could capture the radio signal and retransmit it later.

In other words, if a criminal managed to capture the correct code, they could potentially attempt to reuse it later to unlock the vehicle.

Manufacturers quickly realized that a much more secure system was needed.

This led to the development of technology known as Rolling Code, also referred to as a Variable Code, Dynamic Code, or Hopping Code, depending on the manufacturer and system.

What Is a Rolling Code?

Imagine that every time you use your vehicle’s key, instead of transmitting the same code, an entirely different code is generated.

That, in simple terms, is a Rolling Code.

Every time you press a button on the key or use certain functions of the access system, the vehicle and the key exchange a new code known only to them.

Once that code has been used, it is no longer valid.

The next time, a different one is used.

Then another.

And another.

The same authentication code is not reused.

For that reason, simply capturing a single transmission is no longer sufficient to use it again.

A Simple Way to Understand It

Think about the temporary security codes some banks send by text message when you are making a transaction.

That number works only once.

Afterward, it is no longer valid.

Even if someone were able to see it several minutes later, they could no longer use it.

Rolling Codes operate on a similar principle.

Each valid communication is unique and synchronized between the key and the vehicle.

Does That Mean the Vehicle Is Constantly Changing Its Password?

Not exactly.

What continuously changes is the code used during communication between the two devices.

Both the Smart Key and the vehicle maintain internal synchronization that allows them to determine the next valid code within a predefined sequence.

Everything happens within milliseconds.

The driver never notices the process.

You simply press a button or touch the door handle, and the system performs the entire validation process automatically.

Why Was This Such an Important Advancement?

The introduction of Rolling Codes significantly reduced a type of attack known as a Replay Attack.

In simple terms, a Replay Attack involves attempting to reuse a valid communication that occurred previously.

With a fixed-code system, this represented a problem.

With a properly implemented Rolling Code system, retransmitting an old signal normally produces no result because the vehicle is expecting an entirely different code.

That is why this technology marked a major turning point in automotive security.

Do All Manufacturers Use Rolling Codes?

Today, virtually every major vehicle manufacturer incorporates some form of dynamic authentication into its remote access systems.

However, that does not mean they all use exactly the same technology.

Each manufacturer develops its own algorithms, communication protocols, and encryption methods.

For that reason, the way a Toyota system operates may differ from a system used by BMW, Ford, Mercedes-Benz, or Hyundai.

Although the goal is similar, implementation varies among manufacturers and even among different models produced by the same manufacturer.

Do Rolling Codes Make Vehicle Theft Impossible?

No.

This is where confusion often begins.

Rolling Codes were designed to solve a specific problem: preventing a valid signal from being captured and reused later.

However, modern automotive security consists of many different technologies working together.

Over the years, new attack methods have emerged that target other components of the system, including communication between the key and the vehicle, certain electronic modules, or specific programming procedures.

That does not mean Rolling Codes are no longer effective.

On the contrary, they remain one of the foundations of electronic security used by millions of vehicles around the world.

What has happened is similar to what occurs in computing and cybersecurity: threats evolve, and manufacturers continue developing new technologies to respond to those challenges.

An Interesting Fact

Many people believe that a smart key continuously transmits information 24 hours a day.

In reality, communication between the key and the vehicle occurs only when necessary and under specific conditions defined by the manufacturer.

This helps reduce key battery consumption and is also part of the system’s security design.

What Is a Relay Attack and How Concerned Should You Be?

In recent years, the term Relay Attack has appeared in hundreds of news stories, surveillance videos, and social media posts.

It is common to see recordings where a vehicle appears to unlock and start even though the owner never handed over the key and there are no visible signs that a lock was forced.

For many people, these images are surprising and even concerning.

However, to understand what is actually happening, one important point must first be clarified:

In a Relay Attack, the key is not copied, a new key is not programmed, and, in most cases, the vehicle’s security system is not technically “broken.”

What happens is something entirely different.

What Does the Word “Relay” Mean?

The word relay refers to passing or extending something from one point to another.

In simple terms, a Relay Attack involves temporarily extending communication between a vehicle and its smart key.

Imagine that your key is inside your home while your vehicle is parked in the driveway or garage.

If both devices could temporarily “believe” that they were much closer together than they actually are, the vehicle might interpret the authorized key as being nearby.

That is the basic principle behind a Relay Attack.

It does not involve manufacturing a new key or decrypting the vehicle’s entire electronic security system.

Instead, it involves attempting to extend communication between two devices that would normally need to be physically close to one another.

Can Every Vehicle Be Affected?

No.

This is one of the biggest myths circulating online.

Not all manufacturers use exactly the same technology, and not all vehicle models operate in the same way.

The way a vehicle authenticates the presence of its key depends on several factors, including:

1. The model year.
2. The manufacturer.
3. The model.
4. The generation of the Keyless Entry system.
5. Security updates implemented by the manufacturer.

In recent years, many manufacturers have introduced new technologies specifically designed to reduce this type of risk.

For that reason, a video showing one affected vehicle does not mean that all vehicles operate the same way.

Does a Relay Attack Leave Damage on the Vehicle?

Generally, no.

One of the characteristics that attracted the most attention when these incidents began to be documented was that, in many cases, the vehicle showed no visible signs of forced entry.

The doors could sometimes be opened without breaking a window, and from the outside it might appear as though the owner had simply used the authorized key.

That does not mean the security system completely failed.

It means the vehicle received information that it interpreted as valid during that specific moment.

Did Manufacturers Simply Ignore the Problem?

Definitely not.

The automotive industry responded quickly.

Each new generation of vehicles incorporates improvements intended to strengthen authentication between the key and the vehicle.

Some manufacturers began using sensors capable of detecting movement within the key itself.

Others strengthened their encryption systems, while several introduced technologies such as Ultra Wideband (UWB), which can measure the actual distance between the key and the vehicle with much greater precision.

In other words, automotive security continues to evolve.

Whenever a new threat appears, manufacturers develop mechanisms intended to make it more difficult or significantly reduce its effectiveness.

What Can You Do to Reduce the Risk?

Although no system provides absolute protection, there are simple measures that may help strengthen your vehicle’s security.

Some recommendations include:

1. Avoid leaving your smart key near exterior doors or windows in your home.
2. Store the key in a secure location when the vehicle is not in use.
3. Keep your vehicle’s software updated when the manufacturer releases security improvements.
4. Check whether your vehicle has additional security features that can be activated through its settings menu.
5. Review the owner’s manual for recommendations specific to your vehicle.

In some cases, you may also consider using a pouch or case with electromagnetic shielding, commonly known as a Faraday Pouch.

Later, we will explain what these products are, how they work, and when they may actually be a useful option.

Not Everything You See Online Reflects Reality

One of the most common mistakes is assuming that every viral video proves that all vehicles are vulnerable.

The reality is much more complex.

Each manufacturer uses different technologies, and many videos circulating on social media leave out important information, such as the exact vehicle model, model year, circumstances surrounding the incident, or security features incorporated into that particular vehicle.

For that reason, it is important to evaluate this type of content carefully and avoid drawing broad conclusions from isolated incidents.

Security Is a Constant Race

The history of automotive security has always involved a continuing race between those developing new protective technologies and those attempting to defeat them.

The important thing to understand is that manufacturers do not remain static.

Each new generation of vehicles incorporates improvements that make it more difficult to repeat techniques used years earlier.

This ongoing process of evolution is precisely what has allowed today’s vehicles, generally speaking, to become significantly more secure than those produced decades ago.

Ultra Wideband (UWB): The New Generation of Smart Key Security

As smart keys evolved, so did the security measures designed to protect them.

One of the most important technologies incorporated by several manufacturers in recent years is known as Ultra Wideband, or simply UWB.

Although many drivers may be unfamiliar with the term, it may already be present in their vehicle or become part of future models entering the market.

Its purpose is simple: to confirm that the key is actually near the vehicle rather than merely communicating with it.

What Does Ultra Wideband Mean?

Ultra Wideband is a high-precision wireless communication technology.

Unlike other systems that simply verify whether communication exists between the key and the vehicle, UWB can also estimate the physical distance between them with much greater accuracy.

In other words, it does not only answer the question:

“Is the key responding?”

It also helps answer:

“Is the key actually next to the vehicle?”

That difference may seem small, but it represents an important advancement in security.

Why Was This Technology Necessary?

The first generations of Keyless Entry systems were designed primarily for convenience.

As long as the vehicle detected the presence of an authorized key within a certain range, it could allow the doors to be unlocked or the engine to be started.

Over time, manufacturers began researching new ways to validate this information and reduce the possibility that a vehicle could incorrectly interpret the location of the key.

That is how technologies such as Ultra Wideband began to be incorporated into vehicles from different manufacturers.

How Does It Improve Security?

• We can imagine it using a simple example.
• Suppose someone calls you on the phone.
• You know who is speaking.
• But you do not know where that person is.

Now imagine that, in addition to recognizing the person’s voice, you could determine whether they were standing directly in front of you, in another room, or several miles away.

• That additional level of information is, generally speaking, one of the advantages provided by UWB.
• The vehicle does not rely solely on receiving an electronic response.
• It also receives much more precise information regarding the key’s actual location.

Do All Vehicles Use UWB?

No.

This technology is still expanding throughout the automotive industry.

It can currently be found in different models from manufacturers such as BMW, Mercedes-Benz, Volkswagen, Hyundai, Kia, Genesis, and others that have begun incorporating it into certain vehicle platforms.

However, many vehicles currently on the road were manufactured before this technology became available.

For that reason, not all vehicles provide the same level of protection.

Each manufacturer decides when to introduce new technologies and which models will receive them.

Does UWB Make a Vehicle Impossible to Steal?

No.

• It would be incorrect to claim that any technology can make a vehicle completely invulnerable.
• Absolute security does not exist.

What does happen is that each new generation of security systems adds additional layers of protection that make it significantly more difficult to defeat the authentication mechanisms used by the vehicle.

That is precisely the direction the automotive industry has followed over the past several decades.

Security Works in Layers

Many people imagine vehicle security as though it depended entirely on a key.

The reality is very different.

Today, a modern vehicle may combine multiple systems working simultaneously.

These may include:

• Smart Keys.
• Electronic immobilizers.
• Rolling Codes.
• Encrypted authentication systems.
• Ultra Wideband (UWB).
• Specialized electronic modules.
• Factory-installed alarm systems.
• Sensors located throughout different areas of the vehicle.

Each system serves a specific purpose.

When they work together, they make the authentication process significantly more robust than it was only a few years ago.

For that reason, discussing the security of a modern vehicle involves much more than simply discussing a key.

Technology Continues to Advance

One of the most interesting things about the automotive industry is that it never stops evolving.

Manufacturers continue investing millions of dollars in research and development to strengthen the security of their vehicles.

Each new model incorporates software improvements, new sensors, more sophisticated authentication systems, and updates designed to address challenges that emerge over time.

In other words, the security of a modern vehicle is a constantly evolving process.

About the Author

José O. Colón Cruz, CAPM, SC

Automotive Locksmith, Smart Key Programming, and Electronic Security Systems Specialist

With more than 42 years of experience in the locksmith industry, José O. Colón Cruz has witnessed the evolution of automotive security from traditional mechanical keys to modern Smart Key systems, electronic immobilizers, transponder programming, and advanced authentication platforms used by leading vehicle manufacturers.

Throughout his professional career, he has worked with domestic and imported vehicles, providing specialized services that include damage-free vehicle unlocking, smart key programming and replacement, transponder key duplication, electronic immobilizer diagnostics, and solutions for a wide variety of automotive security systems.

His hands-on experience, combined with continuous study of the new technologies used throughout the automotive industry, allows him to educate vehicle owners about how modern security systems operate, helping them better understand how to protect their investment and make informed decisions when hiring services related to vehicle keys and electronic systems.

Our Commitment to Our Readers

At AsistenciaEnLaCarretera.com, we believe that protecting a vehicle begins with accurate, responsible, and up-to-date information.

For that reason, our articles are prepared using professional experience, technical documentation, and recognized publications within the automotive locksmith and electronic security industries.

Technology is constantly evolving. Every year, manufacturers introduce new authentication systems, software updates, and protective mechanisms for their vehicles.

Because of this, this article will be periodically reviewed and updated in order to maintain its accuracy and continue providing useful information to our readers.

Our commitment is to guide, educate, and assist vehicle owners while always promoting responsible security and prevention practices.

Research and Reference Sources

The information presented in this article was developed based on the author’s professional experience and the analysis of technical documentation, specialized literature, and publications from internationally recognized organizations in the fields of automotive locksmithing and electronic security.

The primary references consulted include:

• ALOA Security Professionals Association (ALOA).
• International Association of Automotive Locksmiths (IAAL).
• Technical documentation and manuals published by vehicle manufacturers.
• Specialized manuals covering electronic immobilizers and automotive key programming.
• Technical publications related to Smart Keys, Rolling Codes, Keyless Entry, Ultra Wideband (UWB), and other automotive security technologies.
• Technical information and bulletins from manufacturers of professional automotive programming and diagnostic equipment.

Publication Date

First published: July 2026

Last reviewed: July 2026

Note: This article will be updated as automotive security technologies evolve and manufacturers release new solutions or recommendations.

Need Help With Your Vehicle Key?

If you need to program a Smart Key, replace a lost key, unlock a vehicle without causing damage, or receive guidance regarding your vehicle’s security, our team is available to assist you.

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