The automatic transmission control unit (often designated as TCU or TCM) is a crucial electronic component responsible for smooth and trouble-free gear shifting. Its failure, most often caused by overheating, short circuits, or water damage, results in jerking, an inability to shift gears, or the vehicle entering limp mode. Purchasing a new module at an authorized dealership is a massive expense, which is why replacing it with a fully functional, used original is the most reasonable solution.
Engine Control Unit Volkswagen, Seat 1.2 TDI Delphi DCM3.7 03P906021AA 28299664
Vendors's code: 28299664
Product code: 28299664
Barcode:
Code 39:
ISBN:
€162.60
Price
€162.60
€200.00
Price
€200.00
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, Seat 1.2 TDI Delphi DCM3.7 03P906021AA 28299664
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€30.00
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(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
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Looking for ECU 03P906021AA for a Volkswagen or Seat 1.2 TDI?
We are offering a used, working Delphi DCM3.7 engine ECU with VW number 03P906021AA and Delphi number 28299664. It comes from a 1.2 TDI engine and is available in a locked or unlocked version.
Engine Control Unit Volkswagen, Seat 1.2 TDI Delphi DCM3.7 03P906021AA 28299664
This ECU is not made by Bosch but by Delphi – it belongs to the DCM3.7 family, the manufacturer's range of diesel engine ECUs. In Volkswagen and Seat vehicles with the 1.2 TDI engine, module 03P906021AA manages fuel injection, turbo boost and starting. When replacing it, what counts is that the numbers match, not just the engine size.
Markings on the casing
- 03P906021AA – Volkswagen part number
- 28299664 – Delphi manufacturer number
- DCM3.7 – Delphi diesel ECU family
The letters AA at the end of the VW number indicate the module version. When replacing it, it is best to stick to an identical number, as a different suffix may mean different software.
Symptoms of a faulty diesel ECU
- the 1.2 TDI engine will not start or cuts out straight after starting,
- a message about no communication with the engine module,
- reduced power and the engine warning light on with no sensor faults,
- a fault after a voltage spike, e.g. during a jump start.
Before ordering an ECU, check the battery, earths and the condition of the plug.
Locked ECU or one prepared for fitting
An unlocked ECU is prepared before dispatch – as standard this takes 1–2 working days. In the locked version, the module has the data and immobiliser of the vehicle it was removed from stored in it; it is bought by workshops that will unlock and match it themselves.
The availability of methods (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, cloning) depends on the number, software and immobiliser, so it is worth asking before buying what can be done for this Delphi unit. Description of the options: ECU preparation options.
Questions and answers
| Are 28299664 and 03P906021AA the same module? |
|---|
| Yes. The first number was assigned by Delphi, the second by Volkswagen. |
| Can a Delphi ECU be replaced with a Bosch ECU? |
| No. Choose a module with the same VW number, i.e. 03P906021AA. |
| What condition is the ECU in? |
| Used, in working order and in good condition. You will find the warranty period in the product features table. |
For enquiries about ECU 03P906021AA, email contact@auto24parts.com – we will tell you which options are available.
