Immobiliser
Programming.
Car won't start despite a correct key? Our specialists diagnose and resolve immobiliser faults using professional ECU-level diagnostic tools.
What We Do
What Is an Immobiliser?
An immobiliser is an electronic anti-theft device fitted to virtually all vehicles manufactured after 1998. It prevents the engine from starting unless it receives an authorised signal from the key's transponder chip. When the immobiliser doesn't recognise the key, it disables the fuel injection or ignition circuit, making the vehicle impossible to start.
When all keys are lost or the immobiliser module is faulty, standard OBD programming may not be possible. In these cases, we physically access the ECU's EEPROM chip — a small memory component that stores the vehicle's security data. By reading this chip directly, we extract the security seed and use it to generate a new authorised key or re-programme the immobiliser. Access247 technicians are experienced in EEPROM procedures for all major vehicle platforms.
How It Works
How We Fix an Immobiliser Fault
How EEPROM Programming Works
EEPROM (Electrically Erasable Programmable Read-Only Memory) is a small chip on the vehicle's ECU that stores the immobiliser security seed — a unique cryptographic identifier paired to the original keys. When all keys are lost, we read this chip directly using specialist hardware, extract the security seed, and use it to generate a new authorised key without any existing key being present.
This process requires specialist equipment and trained technicians. Access247's technicians are experienced in EEPROM procedures for all major vehicle platforms.
Immobiliser Services We Provide
| Situation | Our Solution | Avg Time |
|---|---|---|
| Key-to-Immobiliser Synchronisation | Key replaced without re-pairing, or sync lost after ECU reset | 30–60 min |
| EEPROM Read & Key Generation | All keys lost — we extract the security seed from the ECU chip | 60–90 min |
| Immobiliser Bypass (legit) | Faulty immobiliser module preventing a working key from starting the car | Variable |
| ECU Replacement & Programming | ECU swap requiring re-synchronisation with existing keys and immobiliser | Variable |
| Anti-Theft Reset | False alarm immobiliser triggering preventing normal use | 30–45 min |
Vehicles & Systems We Work On
Leeds Areas We Cover for Immobiliser Repair
Our immobiliser repair service covers all of Leeds and West Yorkshire — including Leeds City Centre, Headingley, Roundhay, Beeston, Cross Gates, Bradford, Wakefield, Huddersfield and all surrounding postcodes. Call to confirm your exact area.
FAQ
Frequently Asked Questions
What causes an immobiliser fault?+
Common causes: dead key fob battery, faulty transponder chip, ECU reset or battery disconnect clearing key data, or failure of the immobiliser module itself.
Can the immobiliser be reset without the original key?+
Yes. Using EEPROM reading, we extract the security seed directly from the ECU and generate a new authorised key without an existing key.
Will this void my warranty?+
Standard key learning via OBD does not void manufacturer warranties. We use the same procedures as main dealers.
How do I know if it's the immobiliser and not another fault?+
The immobiliser warning light (a car outline with a key inside it) staying on after starting is the clearest indicator. We can also diagnose via OBD fault code reading.
Also Available
Our Other Services
Need Immobiliser Repair Now?
Mobile service across West Yorkshire. We come to you. Average 30-minute response. Price confirmed before we start.