Ghost immobiliser alternative — why relay wins

Ghost uses your car’s CAN bus. LockCar uses a physical relay. Same result — engine won’t start — but completely different risk profile, price, and usability.

Relay vs CAN bus · Warranty safety · No PIN · Lower price

Ghost is the UK’s best-known aftermarket immobiliser — and it works. But it connects to your car’s ECU network, requires a PIN sequence to disarm, has voided warranties on BMW and Volvo vehicles, and costs more to install than relay alternatives. Here is why a growing number of UK car owners are choosing differently.

Feature	Ghost (CAN bus)	LockCar IC3ST / IS357 (relay)
Method	CAN bus ECU signal	Physical 20A relay circuit cut
ECU contact	Yes — connects to CAN bus	Zero — no ECU contact
BMW warranty	Explicitly voided by BMW	Not affected — relay only
Volvo warranty	Installer reports: voided	Not affected
Disarming method	PIN sequence on dash buttons	Proximity tag hands-free
Lockout risk	Yes — forgotten PIN	No — backup methods included
GPS tracking	No — separate product	Available in ONE Plus (£259)
App features	No app	Full app — alerts, status, remote
Fitted price	£450–600	From £300

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BMW owners specifically: BMW has confirmed in writing that Ghost-fitted vehicles are not covered under manufacturer warranty. If your BMW is in warranty, the IS357 is the relay alternative — zero CAN bus contact, manufacturer warranty unaffected.

What Ghost does better

To be fair: Ghost has a significantly larger installer network, greater brand recognition among insurers, and a well-established product history. If your insurer specifically requires a Thatcham-approved device by name, Ghost may satisfy that requirement where LockCar products do not. Check your insurer’s specific requirements before choosing.

The relay alternative to Ghost — UK made

LockCar IC3ST — £139 | IS357 — £149

Better warranty safety. Hands-free disarming. Full app control. Lower installed price. Zero ECU contact.

Compare the range → Ask Victor directly

From £300fully fitted