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 Smart Fortwo 1.0 0261S04778 A1321502379001
Vendors's code: 0261S04778
Product code: 810F-38715
Barcode:
Code 39:
ISBN:
€162.60
Price
€162.60
€200.00
Price
€200.00
In stock
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 Smart Fortwo 1.0 0261S04778 A1321502379001
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Shipping
from
€30.00
-
shipping
(Poland)
from
€30.00
-
shipping
(Poland)
Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
Shipping cost for the selected product
The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
Control unit number 0261S04778 - is this the right part?
A used engine control unit for the Smart Fortwo - numbers 0 261 S04 778 / 0261S04778; A1321502379 001 / A1321502379001: in working order and in good condition. Before you order, check that the numbers match your module.
Engine control unit for Smart Fortwo
When the engine in a Smart Fortwo 1.0 runs unevenly or will not start, and diagnostics point to the control unit, replacing it with a used module in working order can be the cheapest solution. This unit is in good condition.
Numbers to compare
- 0 261 S04 778 / 0261S04778 - manufacturer's number (Bosch)
- A1321502379 001 / A1321502379001 - vehicle part number
Application according to the listing
- Smart Fortwo - model
- 1.0 - engine according to the listing
- Bosch - manufacturer
The role of the control unit in the engine
The module's electronics store fault codes that can be read with a diagnostic tool. They help to establish whether the sensors, the wiring or the control unit itself is to blame. After replacement, the module usually has to be matched to the car, and in some cars it also needs coding or adaptation.
Fitment
We have several control units for this model in our range, with different numbers. It is the number on the label that counts, not the model name alone. The numbers given come from our listing; always compare them with the markings on your control unit.
Symptoms of a faulty control unit
- irregular idling,
- the car stalls when you release the accelerator pedal,
- crankshaft position sensor faults,
- the injection system warning light comes on.
Note down the stored fault codes before removing the unit, as after the replacement they will help you judge whether the problem has been solved.
Locked or unlocked variant?
A locked control unit keeps the previous car's data and immobiliser coding, so it is intended for garages that will unlock, program and match it to the vehicle themselves. The unlocked variant means that we prepare the module for you before dispatch; this usually takes approx. 1-2 working days. Not all unlocking methods - PIN / CAR PASS, Virgin, IMMO OFF, auto-programming or cloning - are available for every number, as a lot depends on the software and the immobiliser. If in doubt, ask us before ordering. Read about the variants: locked and unlocked explained.
Frequently asked questions
| What condition is this part in? |
|---|
| It is a used part, in working order and in good condition. You will find the warranty period in the product features table. |
| What should I check on delivery? |
| Check that the numbers match the description and that the connectors and housing show no cracks or signs of corrosion. |
| Where can I find the number on the control unit? |
| You will usually find the numbers on the label or the housing of the module, visible once it has been removed from the car. If you cannot read them, send us a photo. |
Unsure? Send a photo of your control unit to contact@auto24parts.com and we will check it for you.
