How It Works and What It Costs

Car theft in the UK has changed. Thieves no longer need to break a window or force a lock, because relay attacks and key cloning let them drive a car away in under a minute.

A Ghost immobiliser is an aftermarket security system that stops your car from starting until you enter a unique PIN code using buttons already fitted inside the vehicle, such as those on the steering wheel, dashboard or centre console. There is no key fob to clone, no LED light to spot and no visible box for a thief to find. Even with your original key in hand, someone cannot drive off without your sequence.

The Autowatch Ghost 2 connects to your car’s CAN bus system, which means it works quietly in the background alongside factory features. This guide explains how the Ghost II immobiliser prevents unauthorised starting, what to expect from fitting, how it works with other security measures, and the questions owners ask most often.

Key Takeaways

A Ghost immobiliser blocks the engine from starting until you enter your own PIN sequence using the car’s existing buttons.
Fitting is covert and works best when paired with other measures such as a tracker or steering lock.
Professional installation matters, so check compatibility and use an approved installer before booking.

How the System Prevents Unauthorised Starting

A Ghost immobiliser blocks the engine from starting until you enter a PIN code using buttons already fitted inside your car. Because it talks directly to the vehicle’s own data network and emits no radio signal, a thief with your key, a cloned key, or a relay device still cannot drive away.

CAN-Bus Connection and ECU Control

The Ghost wires into your vehicle’s Controller Area Network (CAN bus). This is the network your car’s modules use to communicate with each other.

Instead of cutting into the starter circuit or fuel pump wiring, the device sends a message across the network that keeps the engine control unit (ECU) from allowing the engine to run.

This matters for two reasons. First, there is no cut loom or added relay for a thief to spot and bridge. Second, the unit can be hidden almost anywhere the CAN wiring reaches.

Vehicle compatibility depends on the network your car uses. Newer models with high-speed CAN-FD or dual-network support require the Ghost-III platform, while the earlier Ghost-II supports a single CAN network on many older vehicles.

PIN Code Entry Through Vehicle Buttons

Your PIN is a sequence of button presses, not a number typed on a keypad. The installer programmes it using controls your car already has:

Steering wheel buttons (volume, cruise, phone)
Door panel switches, such as window or mirror controls
Centre console and climate buttons

Sequences can be up to around 20 presses long, and you can mix buttons from different areas. That makes guessing impractical.

You get in, start the engine or switch on the ignition as normal, then enter the sequence. Once the code is accepted, you drive away.

Enter the wrong sequence, and nothing happens. The engine will not run, and there is no prompt or warning light telling anyone that a code is needed.

Protection Against Key Cloning and Relay Attacks

Most modern car theft targets the key rather than the lock.

Attack method	What the thief does	Why the Ghost stops it
Relay attack	Boosts the signal from your key inside your home to unlock and start the car	Engine still immobilised without the PIN
Key cloning	Copies the transponder data via the OBD port or a spare key	The clone does not know your button sequence
Key theft or burglary	Takes the genuine key	The genuine key alone will not let the car be driven

The Ghost adds a second factor that lives with you, not with your car keys. A stolen or copied key handles authentication with the vehicle, but the PIN sequence sits separately in the immobiliser.

Invisible Operation Compared With a Car Alarm

A traditional car alarm reacts after someone breaks in. Sirens sound and lights flash, drawing attention but not stopping a determined thief from driving off.

A Ghost alarm works differently. There is no siren, no flashing LED, no aerial and no sticker, so the installation stays invisible.

Because the unit produces no radio-frequency signal, standard diagnostic scanners and RF detectors will not detect it. A thief has no way of knowing why the car will not start.

Many owners run both. The alarm deters entry, and the immobiliser prevents the drive-away.

Phone App, Smartphone App, and Driver Authorisation

Some Ghost installations pair with a smartphone app that acts as a second way to authorise the driver. The phone app can disarm the system over Bluetooth as you approach or sit in the car, so you skip the button sequence on everyday trips.

The PIN stays available as a backup. If your phone is flat, lost or left at home, you enter the sequence instead.

Note that app support depends on the Ghost model and the installer’s setup, so check what is included before booking your fit.

Service Mode and Valet Mode

You will sometimes need to hand the car over without giving away your PIN. Service mode covers this.

You enter your sequence, then a short extra command puts the immobiliser into a temporary bypass. The car starts normally for anyone with the key, which suits a garage visit, an MOT, valeting or a car park attendant.

Service mode is designed to be limited rather than open-ended. Depending on how it is configured, it can end after the car is locked, after the key is removed, or after a set number of ignition cycles, so protection returns without you having to remember.

Once it clears, the PIN is required again before the engine will run.

Choosing, Fitting, and Combining Security Measures

Getting the most from a Ghost immobiliser depends on three things: making sure it suits your vehicle, having it fitted by someone Autowatch has trained, and pairing it with other devices that cover what an immobiliser cannot. The points below walk you through compatibility checks, approval schemes, typical costs, and the extras worth adding.

Checking Vehicle Compatibility Before Booking

Ghost works by talking to your car’s CAN bus, so the model and year matter. Most modern petrol, diesel, hybrid, and electric vehicles from around 2008 onwards are supported, but coverage varies by manufacturer.

Before you book, have this information ready:

Registration number and VIN
Make, model, and year
Trim level (button layouts differ)
Any existing aftermarket alarm, tracker, or remote starter

The buttons you use for your PIN come from your car’s controls, so the installer needs to know which ones you have. On some vehicles the sequence uses steering wheel buttons; on others it might use window switches or climate controls.

A good installer will confirm compatibility over the phone or by email rather than turning up only to find the car is unsuitable.

Using an Autowatch Approved Installer

Autowatch trains and lists approved installers, and there are sound reasons to use one.

An approved installer knows where to hide the module on your specific vehicle, how to splice into the loom without damaging factory wiring, and how to programme a PIN sequence that suits your car’s button layout. They also register the unit, which matters if you ever need support or a code reset.

Fitting by an untrained person carries real risks: warning lights, intermittent starting faults, and modules placed somewhere a thief would check first.

Ask any installer to confirm they are Autowatch approved before you pay a deposit. It is a simple question, and a genuine installer will answer it without hesitation.

TASSA and Thatcham Approval Considerations

This is where some confusion creeps in, so it is worth being clear.

Scheme	Status	What it means for you
TASSA	Ghost installers are commonly TASSA registered	Registers the fitment and installer, adds traceability
Thatcham	Ghost is not a Thatcham-certified immobiliser	Insurers may not apply an automatic discount

Thatcham certification is the recognised UK benchmark that many insurers use when deciding on security discounts. Ghost sits outside that scheme.

That does not mean it is weak. Ghost protects against relay attacks, key cloning, and OBD port hacking, which are the methods behind most modern vehicle thefts.

Still, tell your insurer it is fitted. Some will note it, some may ask about it, and failing to declare a modification can cause problems at claim time.

Mobile Installation and the Fitting Process

Many installers offer mobile installation, coming to your home or workplace instead of asking you to visit a unit.

A typical fitting takes two to four hours, depending on the vehicle and where the module is being hidden. You will need to hand over your keys and leave the car accessible for that period.

What happens on the day:

The installer confirms the vehicle and discusses PIN options with you
Trim panels are removed to reach the wiring loom
The module is connected and concealed
Your PIN sequence is programmed
Service mode and any phone pairing are set up
You get a walkthrough and a demonstration

Choose your own PIN if you can, and make it something you will remember under pressure. Practise entering it a few times before the installer leaves.

Ghost Immobiliser Cost, Warranty, and Insurance

Expect to pay roughly £40-£55, including VAT and fitting, for a Ghost 2. Prices vary by installer, vehicle complexity, and whether mobile fitting is included.

Autowatch provides the Ghost with a 2-year warranty. Installers often add their own labour guarantee on top, so ask what is covered and for how long.

On insurance: a Ghost is unlikely to reduce your insurance premium on its own, because it lacks Thatcham approval. Some specialist and performance insurers take a more flexible view, particularly for vehicles that are frequently targeted.

Declare the fitment either way. Treat any saving as a bonus rather than the reason for buying.

Adding a Vehicle Tracker, GPS Tracker, or Dash Cam

An immobiliser stops your car being driven away. It does not help if the vehicle is lifted onto a flatbed, nor does it record what happened.

That is where layering comes in:

A vehicle or GPS tracker provides live location data and helps police recover the car. Thatcham-approved trackers with monitoring subscriptions are often the ones insurers recognise.
A dash cam captures attempted break-ins, vandalism, and collisions. Parking mode models continue to monitor the car while it is unattended.

Suppliers such as Trackershop and various regional installers offer bundles that combine Ghost with a tracker, a dash cam, or both.

Booking these together usually costs less than booking them separately, and you deal with one installer rather than three.

Frequently Asked Questions

Below you’ll find clear answers on how the Ghost works with your car’s existing buttons, what it costs to fit, how it holds up against relay attacks and key cloning, and how to find an approved installer.

How does a Ghost Immobiliser work?

The Ghost connects to your vehicle’s CAN bus, the internal network that lets the car’s control units talk to each other. It stops the engine from starting until you enter a PIN sequence.

You create that sequence using buttons you already have. Steering wheel controls, door switches, or dashboard buttons can all be used, and the code can be up to 20 presses long.

There are no extra key fobs and no radio signals involved. That means there’s nothing for a thief to scan, jam, or intercept.

If someone tries to drive off without entering the correct sequence, the car stays immobilised. There’s also a Service Mode, which lets a garage move and test your car without knowing your PIN.

Can thieves bypass a Ghost Immobiliser?

No security product is completely unbeatable, but the Ghost removes the methods thieves rely on most. Relay attacks copy the signal from your key fob, and key cloning creates a working duplicate key. Neither of these helps if the PIN hasn’t been entered.

The unit is also small and can be hidden in different places on different cars. Since it produces no signal of its own, a thief can’t use a scanning tool to find it.

Someone with detailed knowledge of the vehicle and plenty of time could attempt to trace the wiring. In practice, that’s a slow job in an unfamiliar car, which is why most thieves move on.

How much does a Ghost Immobiliser cost, including fitting?

In the UK, professional supply and fitting usually falls between around £449 and £549. Prices vary by installer and location.

A few things push the price up or down:

Vehicle make and model – some cars take longer to work on
Mobile fitting – installation at your home or workplace may cost more
Ghost-II or Ghost-III – the newer Ghost-III supports CAN-FD and dual CAN networks
Extras – additional features or accessories add to the total

There’s no monthly subscription. Unlike a tracker with an ongoing fee, you pay once.

Are Ghost Immobilisers effective at preventing vehicle theft?

They work by prevention rather than recovery. A tracker helps you find your car after it’s gone, while the Ghost aims to stop it leaving in the first place.

The system is TASSA-verified, and Thatcham-approved installations are available. Some insurers recognise approved security systems, though it’s worth checking with yours directly rather than assuming a discount.

The Ghost is most useful if your car has keyless entry, is a commonly targeted model, or is parked on a street or in a public car park.

Bear in mind it doesn’t prevent theft of items from inside the car, and it won’t stop a vehicle being towed away.

Can a Ghost Immobiliser be overridden or removed?

An approved installer can remove or transfer the unit, which is handy if you sell the car or buy a new one.

You’ll need proof of ownership and your PIN details before anyone will do this. That check exists to stop someone else having it taken out without your knowledge.

If you forget your PIN, an approved installer can reset it once you’ve shown you own the vehicle. Don’t attempt removal yourself, as the unit is wired into the CAN bus and mistakes can affect other systems.

Where can I get a Ghost Immobiliser fitted near me?

Use the approved installer search on the Autowatch website, or contact a specialist vehicle security company in your area. Installers are listed across the UK, including in and around major cities.

Fitting usually takes a couple of hours, and many installers offer a mobile service at your home or workplace.

Before you book, check that the installer is TASSA-registered, ask whether they fit the Ghost-II or Ghost-III for your car, and confirm what warranty comes with the work.

Safe and Sound Essex

If you’re based in Essex or the surrounding areas, Safe and Sound is an approved Ghost installation centre. They fit Ghost immobilisers, GPS trackers, and other vehicle security systems.

You have two options for fitting:

Mobile fitting – an installer comes to your home or workplace
Workshop fitting – you book your car in at their Chelmsford workshop

The mobile option is useful if you’d rather not leave your vehicle somewhere for the day.

Alongside Ghost, the company works with other security brands such as Clifford, Viper and SmarTrack. That means you can combine an immobiliser with a tracker if you want both layers of protection.

Some installations come with GPS tracking, so it’s worth asking what’s covered when you book.

What customers say

Safe and Sound Essex has over 200 reviews on Trustpilot. Feedback commonly mentions a smooth booking process and clear communication during fitting.

What you get	Details
Ghost fitting	Approved installation centre
Location	Chelmsford workshop, plus mobile service
Extras	GPS trackers, alarms, other security brands
Coverage	Essex and nearby areas

Before you book, it’s a good idea to check that the installer can work with your specific make and model. Ghost units are matched to your vehicle’s CAN bus system, so compatibility matters.

You’ll also want to ask about the warranty and what support is available if you ever forget your PIN sequence.

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Ghost Immobiliser – Autowatch