Check compatibility with Fiat 500
Original used Magneti Marelli engine control unit designed for selected versions of the Fiat 500 equipped with the 1.2 8V petrol engine. The module is identified by part numbers 51994081, BC.0116757.F and 9GF.T6. The ECU offered here is supplied in VIRGIN condition, with the previous immobiliser data cleared and ready for synchronisation with the vehicle.
Fiat 500 1.2 engine ECU compatibility
- Fiat 500, 312 series, hatchback body style,
- 1.2 8V petrol engine,
- selected versions with manual transmission,
- selected vehicles meeting the Euro 6 emissions standard,
- approximate period of use of this ECU: 2014–2021.
The same vehicle model and engine may have been fitted with different ECU hardware and software versions. Before ordering, compare Fiat part number 51994081, Magneti Marelli reference BC.0116757.F, the 9GF.T6 ECU family and all other information on the label of the original control unit.
Common symptoms of a faulty engine ECU
- the engine does not start even though the battery and starter motor are working correctly,
- no diagnostic communication with the engine control unit,
- the engine stalls unexpectedly or is difficult to restart,
- rough running, misfires or fault codes affecting several cylinders,
- no throttle response or problems completing throttle adaptation,
- immobiliser faults and no engine start authorisation.
Similar symptoms may also be caused by faults in the vehicle wiring, ECU power supply, ground connections, ignition coils, sensors or other electronic modules. A complete vehicle diagnosis is recommended before replacing the ECU.
Programming and preparation of the VIRGIN ECU
The ECU is prepared in VIRGIN condition. This means that the data from the previous vehicle, including immobiliser information, has been cleared. Once correctly installed, the unit is ready to synchronise with the Fiat 500 immobiliser system and store the vehicle-specific data.
Correct synchronisation requires functioning keys, wiring and the remaining components of the immobiliser system. After installation, we recommend clearing stored fault codes and carrying out a new diagnostic scan of the vehicle.
If automatic synchronisation is not suitable for a particular vehicle, ECU cloning may be available. In this case, the damaged original ECU and the replacement unit must be supplied. Cloning transfers the immobiliser data, configuration and software information stored in the original ECU. This service is only possible when the memory of the old control unit can be read correctly.
Frequently asked questions
Does ECU 51994081 fit every Fiat 500 1.2?
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No. Several ECU and software versions were used in the Fiat 500 1.2. Compatibility should be confirmed by comparing references 51994081, BC.0116757.F and 9GF.T6 with the original engine control unit.
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Will a Magneti Marelli 9GF.T6 VIRGIN ECU program itself to the vehicle?
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The VIRGIN version is prepared for automatic synchronisation with the vehicle and immobiliser system after correct installation. The other components of the immobiliser system must be fully operational.
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Is the BC0116757F ECU ready to install in a Fiat 500 1.2 8V?
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Yes. The module is tested and prepared in VIRGIN condition. However, all part numbers and the vehicle configuration should be checked before installation to confirm compatibility.
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Can the data from an original Fiat 51994081 ECU be cloned?
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Yes, provided the memory of the damaged ECU can be read correctly. Cloning allows the immobiliser data, vehicle configuration and software to be transferred to the replacement ECU.
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Does a Fiat 500 that will not start necessarily have a faulty 9GFT6 ECU?
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Not necessarily. A no-start condition may also be caused by the immobiliser system, ECU power supply, wiring, sensors or other electronic modules. Proper diagnostics should be carried out before replacing the engine ECU.
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Full range in this group: Fiat Engine Control Units (ECUs).
