You have just collected the keys to a £45,000 vehicle. Your insurer mentions a tracking device. Your mate at work swears by a ghost / CAN immobiliser. So which one actually keeps your car on the drive?
The ghost / CAN immobiliser vs tracker debate gets framed online as a head to head fight. It is not. One stops your car being stolen. The other helps you get it back if it is.
Below you will get a clear verdict, real costs, what insurers actually require, and a simple framework to decide what your vehicle needs. No sales pitch, no jargon.
Ghost / CAN Immobiliser vs Tracker: The Short Answer
A ghost / CAN immobiliser prevents theft by stopping the engine starting without a secret PIN sequence. A vehicle tracker does not prevent theft, it transmits the car’s location to a monitoring centre after it is taken. They are not rivals, they are layers. For most vehicles worth over £30,000, the right answer is both.
The rest of this guide covers how each one works, what your insurer expects, real fitted costs, and when you genuinely need both.
What Is a Ghost / CAN Immobiliser and How Does It Stop Modern Theft?
A ghost / CAN immobiliser is a small device wired discreetly into the vehicle’s CAN bus. It stops the engine starting until the driver enters a unique PIN sequence using existing buttons on the steering wheel, dashboard or centre console.
It defeats the two theft methods that dominate UK car crime today: relay attacks on keyless cars and key cloning. Even with your fob in hand, a thief cannot start the engine without your sequence.
How a ghost / CAN immobiliser works:
- The device sits hidden on the vehicle’s CAN bus network.
- You program a unique PIN sequence using existing buttons inside the car.
- Each time the car is started, the sequence must be entered correctly.
- Without the sequence, the engine will not start, even with the genuine key.
There is no key fob, no flashing LED, no sticker. A thief has no idea it is fitted, which is why bypassing one is extremely rare. We have fitted ghost / CAN immobilisers across Kent for over a decade and have yet to see one beaten on a vehicle that was kept properly secured.
What Is a Vehicle Tracker and When Does It Earn Its Keep?
A vehicle tracker is a GPS and GSM device that transmits the car’s location to a 24/7 monitoring centre. If the car is stolen, the centre liaises with the police to recover it, often within hours.
Trackers are graded by Thatcham Research. The two categories that matter for private buyers are:
- Cat S5: the highest grade, includes driver identification tags. Often required by insurers on vehicles over £75,000.
- Cat S7: entry level, no driver tag, suitable for lower value vehicles or as a second layer.
Trackers run on a yearly subscription, typically £150 to £350 depending on category. The honest caveat: a tracker will not stop your car being stolen. It improves the chance of getting it back.
Ghost / CAN Immobiliser vs Tracker: Side by Side Comparison
Here is the at a glance verdict most readers came for.
| Feature | Ghost / CAN Immobiliser | Vehicle Tracker |
|---|---|---|
| Primary purpose | Prevents theft | Aids recovery |
| Stops car being stolen? | Yes, in most cases | No |
| Recovers stolen car? | Not needed, car not taken | Yes, when monitored |
| Subscription required? | No | Yes |
| Typical fitted cost | £400 to £700 | £300 to £600 plus subscription |
| Insurance impact | Sometimes a discount | Often required on high value cars |
| Visible to thief? | No | No |
| Defeats relay attack? | Yes | No, recovery only |
The pattern is clear. Each product solves a different problem. Treating them as alternatives is the mistake most owners make.
Which One Does Your Insurer Actually Want?
Most UK insurers do not mandate either device on standard vehicles, but many offer premium reductions for both. The picture changes sharply on higher value cars.
Vehicles over roughly £75,000, plus commonly stolen models like high spec Range Rovers, Defenders and certain BMWs, frequently require a Thatcham approved tracker as a policy condition. Some specialist insurers also recognise aftermarket immobilisers in their pricing.
Three points the writer of your policy will care about:
- The device must be Thatcham approved or TASSA registered.
- Installation must be carried out by a recognised installer with a certificate.
- Subscriptions must be active and paid up at the time of any claim.
Without the certificate of installation, your insurer will not recognise the device. Always ask for it on the day of fit. According to , vehicle theft has remained a persistent issue in England and Wales, which is why underwriters now look much more favourably on aftermarket security.
How Much Does Each Cost, Including The Bits People Forget?
A professionally fitted ghost / CAN immobiliser in the UK typically costs £400 to £700. There is no subscription. A Thatcham approved tracker costs £300 to £600 to fit, plus £150 to £350 a year for monitoring.
Over five years, the numbers look like this:
- Ghost / CAN immobiliser: around £550 total, one off.
- Cat S7 tracker: around £450 fit plus £750 in subscriptions, roughly £1,200.
- Cat S5 tracker: around £600 fit plus £1,500 in subscriptions, roughly £2,100.
A bundled security package usually saves £150 to £300 against fitting both separately. Mobile installation, where the engineer comes to your home or workplace, is included in our pricing rather than added on top.
Do You Actually Need Both a Ghost / CAN Immobiliser and a Tracker?
For vehicles worth over £30,000, the honest answer is usually yes. A ghost / CAN immobiliser stops the theft happening. A tracker recovers the car if a determined thief defeats every other layer. Together they give you prevention plus a safety net.
Use this simple decision framework:
- Vehicle under £20,000, low theft risk: a ghost / CAN immobiliser alone is usually enough.
- Vehicle £20,000 to £75,000, especially commonly stolen models: fit both.
- Vehicle over £75,000: fit both, with a Cat S5 tracker, often required by insurer.
Layered security works because every barrier the thief has to defeat increases the chance they walk away. For high theft vehicles like Range Rovers and Defenders, we also recommend a visible deterrent such as a steering wheel lock. Yes, really. Belt, braces and a backup.
Frequently Asked Questions
Is a ghost / CAN immobiliser worth it?
Yes, for any vehicle worth more than £15,000 or any keyless entry car. It is one of the most effective defences against relay attacks and key cloning, the two methods behind most modern UK car thefts. There is no subscription and the device lasts the life of the vehicle.
Can a ghost / CAN immobiliser be bypassed?
Bypassing one is extremely difficult because the device is undetectable. No fob, no LED, no obvious wiring. A thief has no way of knowing one is fitted, let alone how to defeat it. This is why insurers and security specialists rate them so highly.
Does a tracker stop my car being stolen?
No. A tracker only activates after the car is taken. It improves the odds of recovery, often dramatically, but it does nothing to prevent the theft itself. That is why pairing a tracker with a ghost / CAN immobiliser gives you proper protection.
How long does installation take?
A ghost / CAN immobiliser fit takes around two to three hours. A tracker takes one to two hours depending on the model. Our mobile engineers can do both at your home or workplace in a single visit, which saves you a day off and a trip to a unit.
Will fitting either device affect my warranty?
Not when fitted by a qualified auto electrician using the correct CAN bus connection points. We are Thatcham accredited and have been fitting aftermarket security on modern vehicles since 1991, including current Range Rovers, Defenders, Transits and high spec BMWs.
The Bottom Line
A ghost / CAN immobiliser stops your car being stolen. A tracker helps you get it back if it is. For anything worth over £30,000 on your drive, fit both. The cost of doing so is a fraction of the excess on a single insurance claim, never mind the hassle.
Not sure which combination is right for your vehicle? Tell us what you drive and where you keep it, and we will give you a straight answer. No pressure, no hard sell, no contract. We have been doing this from our base in Chatham, Kent since 1991, with over 335 five star Google reviews to show for it.
Get in touch for a tailored quote, or read more HERE.
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