55250921 CFC328F.02 – Selespeed Gearbox Control Module Fiat 500
55250921 / CFC328F02 is an original Selespeed gearbox control module used in Fiat 500 models equipped with the automated manual Selespeed transmission. The module is responsible for full control of gearbox actuators, gear shifting, clutch operation, and communication with other vehicle systems (including engine ECU, ABS, Body Computer).
The most important selection criterion is compatibility by part number. If your module shows number 55250921 or system designation CFC328F.02 / CFC328F02, the offered control unit will be hardware compatible.
Technical specification
- OEM number: 55250921
- Manufacturer designation: CFC328F.02 / CFC328F02
- Transmission type: Selespeed (automated manual)
- Application: Fiat 500
- Condition: fully tested, bench-tested on diagnostic station
- Warranty: yes
Application – compatibility by part number
The gearbox control module 55250921 CFC328F.02 was used in:
- Fiat 500 1.2 8V (169A4.000) – approx. years 2008–2015
- Fiat 500 1.4 16V (169A3.000) – selected versions with Selespeed transmission
- Selected European market configurations with semi-automatic gearbox
Function of the Selespeed gearbox control module
The CFC328F.02 module is responsible for:
- clutch actuator control,
- managing gear selection and shifting,
- control of the hydraulic system pressure,
- CAN communication with other vehicle modules,
- automatic and manual (sequential) mode.
Failure of the control module may manifest itself as: inability to change gears, gearbox emergency mode, CAN communication errors, jerking during take-off, or transmission fault message.
Why is compatibility by number 55250921 crucial?
In the case of Selespeed transmissions, the same car model may appear with different control unit versions. Therefore:
- we do not select only by car model,
- we do not select only by production year,
- we always verify by OEM number from the module label.
If your control unit is marked CFC328F02 and number 55250921, this unit will be the correct choice.
FAQ – Frequently Asked Questions (Q&A)
Does control module 55250921 fit Fiat 500 1.2 8V from 2010?
Yes, provided that the original module shows number 55250921 or designation CFC328F.02. Compatibility is always confirmed by part number.
Difference between CFC328F.01 and CFC328F02 in Fiat 500 1.4 16V?
These are different hardware and software versions. Control module CFC328F02 (55250921) should not be replaced without full number compatibility.
Does 55250921 CFC328F.02 require programming after installation in Fiat 500?
In most cases gearbox adaptation / calibration is required using a diagnostic tester supporting the Selespeed system.
Which engines use gearbox control module 55250921 in model 500?
Most commonly used in versions 1.2 8V (169A4.000) and selected 1.4 16V (169A3.000) with Selespeed transmission.
Fiat 500 Selespeed – no gear change, could CFC328F.02 be faulty?
Yes, one of the common causes of gear selection problems is failure of gearbox control module number 55250921, however full diagnostics is recommended before replacement.
