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 0261S04012 A1321532779
Vendors's code: 0261S04012
Product code: E7F2-10757
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
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 0261S04012 A1321532779
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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.
Does this engine control unit fit your Smart?
A used engine control unit for Smart - numbers 0 261 S04 012 / 0261S04012; A 132 153 27 79 / A1321532779: in working order and in good condition. Before you order, check that the numbers match your module.
Engine control unit for Smart
According to the listing data, this electronic module fits Smart vehicles. This is a used part in working order and in good condition - match it using the numbers in the list.
How this control unit is labelled
- 0 261 S04 012 / 0261S04012 - manufacturer's number (Bosch)
- A 132 153 27 79 / A1321532779 - part number (OEM / vehicle)
- 1321532779 - additional part number
Vehicle data from the listing
- Smart - model
- Bosch - manufacturer
The role of the control unit in the engine
The same car model may have had several control unit versions, depending on the engine, power output and year. The numbers in the list let you tell these versions apart. Some engines have several software versions, so the part number alone is not always enough for a definitive match.
Locked or unlocked variant?
We prepare an unlocked control unit before dispatch (approx. 1-2 working days), so you do not have to do it yourself. A locked control unit is sold with the previous vehicle's data - this is an option for workshops that can unlock and program it. The available methods, such as PIN / CAR PASS, Virgin, IMMO OFF, auto-programming or cloning, vary depending on the number, software and immobiliser. Before buying, send us the number of your control unit. More details: what locked and unlocked mean for an engine control unit.
Matching by number
Our range also includes other control units for this model and engine, with different numbers. Choose by the number on the module, not by the model alone. Versions differ in areas such as engine power, gearbox and equipment, so even similar numbers do not always indicate the same module.
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.
It is worth reading the fault codes with a diagnostic tool first, as some engine faults are caused by sensors or wiring rather than the control unit itself.
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. |
| Do I need an immobiliser key for a locked control unit? |
| With a locked control unit, the unlocking and matching are done by a garage. What is required depends on the model, so ask us about your car. |
| How long does it take to prepare an unlocked control unit? |
| Usually about 1-2 working days before dispatch. We will confirm the timing once you have placed your order. |
Not sure? Write to contact@auto24parts.com and we will help you choose the right control unit for your car.
