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 1.5 CDI 0281012392 A6391501079
Vendors's code: 0281012392
Product code: 55F8-8339C
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 1.5 CDI 0281012392 A6391501079
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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.
How do you choose the right engine control unit for a Smart?
An engine control unit in working order for Smart - numbers 0 281 012 392 / 0281012392; A 639 150 10 79 / A6391501079, a used part in good condition. The numbers on the label decide the match, so compare them with those on your own control unit.
Engine control unit for Smart
A used engine control unit lets you carry out the repair without buying a new, expensive part. This listing is for the Smart 1.5 CDI, and this unit is in working order and in good condition.
Part numbers in this listing
- 0 281 012 392 / 0281012392 - manufacturer's number (Bosch)
- A 639 150 10 79 / A6391501079 - another part number
- 6391501079 - another part number
- PMN902329 - another part number
Car and engine according to the listing
- Smart - model
- 1.5 CDI - engine according to the listing
- Bosch - manufacturer
The role of the control unit in the engine
In diesel engines, the module also controls injection system pressure and boost, while in petrol engines it controls the ignition and the lambda sensors. The range of functions depends on the specific engine and software version. Before buying, it is also worth knowing that the control unit communicates with the car's other modules over the CAN bus, which is why version compatibility matters.
Locked and unlocked variants
In the locked variant, the control unit still holds the security coding and data of the car it came from, so it needs to be unlocked and programmed. We prepare an unlocked control unit before dispatch, which usually takes about 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. See our ECU preparation options and contact us before buying.
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. Versions differ in areas such as engine power, gearbox and equipment, so even similar numbers do not always indicate the same module.
When the control unit needs replacing
- hard starting when the engine is cold,
- smoke from the exhaust and rough running,
- injection system faults stored in the diagnostic memory,
- no response to the accelerator pedal.
Bear in mind that after replacement the control unit may need coding or adaptation - check this for your model.
Frequently asked questions
| Is the part new? |
|---|
| The control unit is used, but in working order. The warranty is stated in the product features. |
| Which number matters most when matching? |
| It is best to compare all the numbers on the module, above all the one marked as the manufacturer's or OEM number. |
| 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. |
Send a photo of your control unit or its number to contact@auto24parts.com and we will confirm whether this part will fit.
