What to know about ECU 55557540
On this page you can buy a Siemens engine control unit for the Opel Vectra C / Signum with the 1.8 16V petrol engine. It is a Virgin version, i.e. reset, with a clean Car Pass (PIN) code, prepared for programming in the car.
Numbers to compare
These are the markings that matter when matching the ECU:
- Opel / GM number: 55557540
- ECU type: Siemens 5WK9441
Vehicle compatibility
The ECU fits the Opel Vectra C / Signum with the 1.8 16V petrol engine. Compatibility is decided by the label number (55557540), not just by the model and year.
Two ways to start the ECU
- Programming after fitting with Tech-2 or OP-COM – the ECU has a clean Car Pass (PIN) code. On request we set the PIN code and write it on the ECU.
- Cloning included in the price – send the files or your whole old ECU, we transfer the data and return both units.
Warranty: 6 months.
Diagnose first
A no-start, no communication in diagnostics or a fault after water ingress or a short circuit can point to a faulty ECU, but they do not have to. Run a diagnosis before buying.
Similar Siemens ECUs
Other part numbers are in the Opel engine ECUs category, and Siemens units are on the manufacturer page.
Frequently asked questions about ECU 55557540
How do I check that 55557540 fits my Opel Vectra C / Signum?
Look at the label on your ECU – it must show the number 55557540. The model and year alone are not enough.
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Does ECU 55557540 come with a warranty?
Yes – 6 months.
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Is cloning charged?
No, cloning is included in the price. Send the files from your ECU or the whole unit – we transfer the data and return both.
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What do I program ECU 55557540 with?
With Tech-2 or OP-COM, after fitting it in the car. The Car Pass (PIN) code is clean.
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