A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
Engine control unit Fiat 500 1.3 Multijet Magneti Marelli 55253513 MJD8F3X1
Vendors's code: MJD8F3X1
Product code: 0603-12595
Barcode:
Code 39:
ISBN:
€284.55
Price
€284.55
€350.00
Price
€350.00
Select a product option:
Individual variants may differ in price
product option
Important: Depending on the ECU type and vehicle model, not all of the options listed below may be available.
To select the correct option for your vehicle and ECU, please contact us before purchasing:
contact@auto24parts.com
1. Locked
This option is intended for professional workshops with the required specialist equipment and technical knowledge.
The ECU has been removed from a vehicle intended for recycling and still contains the immobilizer data and other information from the previous vehicle. Before it can be used in another car, it must be unlocked and then programmed using specialist automotive diagnostic equipment.
2. Unlocked
Several preparation methods may be available. The possible options depend on the ECU type, vehicle model and immobilizer system. Please contact us before purchasing, as some preparation methods are not available for every ECU.
Our electronics specialists can prepare the ECU in one of the following ways:
a) ECU with PIN code (Car Pass)
The PIN code is supplied, but programming with a suitable diagnostic tool is still required. After installing the ECU, it must be reset using the supplied PIN code and then programmed to the vehicle’s immobilizer system.
b) VIRGIN ECU
The data from the previous vehicle is removed and the ECU is restored to a clean, factory-like state. After installation, it must be programmed to the vehicle using a compatible specialist diagnostic tool. Unless another preparation method is specified in the product description, this is the standard unlocking option for most of our ECUs.
c) Plug & Play – IMMO OFF
The immobilizer function is disabled in the ECU. After installation, the engine can start without additional immobilizer programming. Please note that the vehicle will no longer have an active immobilizer function, and an immobilizer warning light or fault code may remain, depending on the vehicle model.
d) Plug & Play – Automatic Programming
After installation, the ECU automatically learns and saves the required vehicle data. No additional programming is normally required.
e) Plug & Play – 1:1 Clone
The data from your original ECU is copied to another fully functional ECU. The cloned unit is then ready for installation without additional programming.
You must send us your original ECU so that we can transfer its data to the replacement unit.
The original ECU must have working communication with the vehicle, a diagnostic tool or our programming equipment. If the required data cannot be read, a complete 1:1 clone may not be possible.
3. Complete Plug & Play Set
A complete matched set containing the ECU, immobilizer components and all other parts required to start the vehicle without additional programming. All components supplied in the set must be installed in the vehicle.
Important:
Dispatch time depends on the selected option. If an unlocked or specially prepared version is ordered, the preparation service usually requires an additional 1–2 business days.
Ask about the product
Engine control unit Fiat 500 1.3 Multijet Magneti Marelli 55253513 MJD8F3X1
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€30.00
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(Poland)
from
€30.00
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shipping
(Poland)
Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
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55253513 engine ECU for your Fiat 500 1.3 Multijet – how to check the fit
This is a used, working Magneti Marelli engine ECU marked 55253513 and MJD8F3X1. We always confirm the fit against the label. Available locked or as Virgin plug & play.
Engine control unit Fiat 500 1.3 Multijet Magneti Marelli 55253513 MJD8F3X1
The 55253513 engine ECU is a Magneti Marelli unit fitted to the Fiat 500 1.3 Multijet. Using signals from the sensors, it manages the engine, including fuel quantity and injection timing.
ECU markings
- 55253513 – Fiat part number
- MJD8F3X1 – Magneti Marelli ECU type, also printed as MJD 8F3.X1
Every character must match, including the final letters. If you are not sure, send us a photo of the label.
Typical fault symptoms
- the starter cranks but the engine does not fire,
- the diagnostic tool cannot connect to the ECU,
- an engine warning light and fault codes that remain after replacing sensors,
- signs of moisture or corrosion on the connectors or circuit board.
Before buying, check the ECU earths and wiring, as a damaged loom produces similar symptoms.
Locked or Virgin?
We offer this ECU in two versions: locked – with the previous car’s data and immobiliser, to be programmed at a garage – and Virgin plug & play, prepared by us before dispatch.
Before ordering the Virgin version, send us the numbers from the label of your ECU – we will confirm whether this preparation method is possible for the 55253513 unit.
All variants are described on our Locked & Unlocked ECUs page.
Questions and answers
| Is MJD8F3X1 the same ECU as 55253513? |
|---|
| Yes. Both numbers appear on the label of the same ECU. |
| What details should I send before ordering? |
| All the numbers from the label of your current ECU, or a clear photo of it. Based on that, we will check the fit and the possible variants. |
| What condition is the ECU in? |
| It is a used part, fully working and in good condition. The warranty period is shown in the product features table. |
Any questions? Send a photo of your ECU label to contact@auto24parts.com – we will tell you whether this unit will fit.
