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 0261S04308 0281S04308
Vendors's code: 0261S04308
Product code: 760B-693A1
Barcode:
Code 39:
ISBN:
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 0261S04308 0281S04308
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Shipping
from
€30.00
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shipping
(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
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.
Is this Smart control unit the right one for your engine?
This is a used engine control unit in working order for Smart - numbers 0 261 S04 308 / 0261S04308; 0 281 S04 308 / 0281S04308. Before buying, compare the numbers with the label on the module in your car.
Engine control unit for Smart
The engine control unit (ECU) collects data from the sensors and uses it to control fuel injection, ignition and engine operation. This listing is for Smart. The part is used, in working order and in good condition.
Part numbers in this listing
- 0 261 S04 308 / 0261S04308 - Bosch number (manufacturer)
- 0 281 S04 308 / 0281S04308 - Bosch number (manufacturer)
- A 132 150 15 79 / A1321501579 - part number (OEM / vehicle)
- 1321501579 - additional part number
Car and engine according to the listing
- Smart - model
- Bosch - manufacturer
Which variant should you choose: locked or unlocked?
A locked control unit is sold with the previous vehicle's data - this is an option for workshops that can unlock and program it. We prepare an unlocked control unit before dispatch, which usually takes about 1-2 working days. Whether the chosen method (PIN / CAR PASS, Virgin, IMMO OFF, programming, cloning) can be used depends on the specific control unit number, its software and the immobiliser. Before buying, send us the number of your control unit. More details: what locked and unlocked mean for an engine control unit.
What an engine control unit does
The control unit communicates with the car's other modules over the CAN bus, including the ABS, the gearbox and the instrument cluster. That is why the software version and the hardware number matter when matching. The module stores fault codes which, once a diagnostic tool is connected, help to establish whether the sensors, the wiring or the control unit itself is to blame.
How to match this part
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. Fitting is best left to a garage with suitable diagnostic equipment, as the module often needs coding and adaptation after replacement.
Symptoms of a faulty control unit
- the engine only runs intermittently,
- the control unit gets hot or resets,
- injector faults appear,
- the diagnostic tool cannot detect the module.
Bear in mind that after replacement the control unit may need coding or adaptation - check this for your model.
Questions and answers
| Is the part new? |
|---|
| The control unit is used, but in working order. The warranty is stated in the product features. |
| How can I check whether the control unit will fit my car? |
| Compare the model, year, engine and the numbers on the control unit fitted in your car with the numbers in the description. You can also send us a photo. |
Unsure? Send a photo of your control unit to contact@auto24parts.com and we will check it for you.
