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 0261S05709 A1329000200
Vendors's code: 0261S05709
Product code: DCF7-90504
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
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 0261S05709 A1329000200
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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 0 261 S05 709 / 0261S05709; A1329000200, 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
The engine computer is one of the key modules in a car - it determines the amount of fuel, the ignition timing and how the engine runs both cold and hot. The unit on offer is for Smart; it is used, in working order and in good condition.
Numbers to compare
- 0 261 S05 709 / 0261S05709 - manufacturer's number - Bosch
- A1329000200 - vehicle part number
Application according to the listing
- Smart - model
- Bosch - manufacturer
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. In the unlocked variant, we prepare the module before dispatch - this usually takes 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. You will find details here: locked versus unlocked engine control units. We are also happy to answer any questions before you buy.
The role of the control unit in the engine
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. Damage can result from water ingress, a voltage surge or wear of the electronic components, and it can show up intermittently.
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. If in doubt, send us the number from the label or a photo of the module and we will check the fit before you buy.
When the control unit needs replacing
- an engine fault appears after the battery has been replaced,
- the control unit's supply voltage is unstable,
- power drops once the car has warmed up,
- the engine goes into limp mode for no obvious reason.
If the control unit has already been repaired or coded, mention this in your enquiry - it will make it easier to choose the right version.
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. |
| Does the control unit need coding after replacement? |
| That depends on the make, model and version. The module usually has to be matched to the car, especially when it works with the immobiliser. |
| 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. |
Send a photo of your control unit or its number to contact@auto24parts.com and we will confirm whether this part will fit.
