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 Volkswagen Bosch 03L907309AB 0281017904
Vendors's code: 0281017904
Product code: C189-35967
Barcode:
Code 39:
ISBN:
€487.80
Price
€487.80
€600.00
Price
€600.00
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 Volkswagen Bosch 03L907309AB 0281017904
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Shipping
from
€30.00
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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.
How can I check whether 03L907309AB will fit my Volkswagen?
Find the label on the casing of your old ECU and compare VW number 03L907309AB and Bosch number 0 281 017 904. Both numbers matching is the basis for compatibility.
Engine Control Unit Volkswagen Bosch 03L907309AB 0281017904
03L907309AB is Volkswagen's designation for this engine control unit, while 0 281 017 904 is a Bosch number belonging to the group of modules for diesel engines. The ECU controls injection, starting and engine operation under different conditions, and logs fault codes if problems occur. We sell it used, working and in good condition.
Numbers on the label
- 03L907309AB – VW part number
- 0281017904 – Bosch number, on the sticker as 0 281 017 904
Check the last two letters of the VW number carefully. The AB suffix defines the software or hardware version – a 03L907309 module with different letters is a different version and may need changes.
When the ECU may be faulty
- the engine will not start despite a working starter motor,
- sudden switch to limp mode while driving,
- the ECU will not connect to the diagnostic tool,
- internal module faults that return after being cleared.
Before deciding to replace it, measure the supply voltage, check the earths and inspect the connector for moisture and green deposits on the pins.
Which version to order
When ordering this ECU, you choose the locked or unlocked version. The first retains the data and immobiliser of the previous car – this is the option for workshops that unlock, program and adapt modules in-house. The second is prepared by us before dispatch; this usually takes 1–2 working days.
The type of preparation (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) depends on the number, software and immobiliser, so not every one will be available. Ask before buying. Description of all options: ECU preparation options.
Questions and answers
| Is it enough for the number to start with 03L907309? |
|---|
| No. What counts is the full number including the AB suffix. |
| Can I order without knowing about the immobiliser? |
| Yes, but it is worth asking before buying which preparation method is possible for 03L907309AB. |
| Will the locked version start the engine? |
| Not straight away – it needs to be unlocked and adapted in a workshop. |
| What condition is the ECU in? |
| Used, working, in good condition. You will find the warranty period in the product features table. |
Send a photo of the label to contact@auto24parts.com – we will help confirm the number.
