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 Polo 6R 1.2 TDI Delphi 03P906021B 28317442 03P907425
Vendors's code: 28317442
Product code: 28317442
Barcode:
Code 39:
ISBN:
813,01 zł
Price
813,01 zł
1 000,00 zł
Price
1 000,00 zł
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 Polo 6R 1.2 TDI Delphi 03P906021B 28317442 03P907425
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Shipping
from
120,00 zł
-
shipping
(Poland)
from
120,00 zł
-
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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What does the number 03P907425 on the 03P906021B ECU from a Polo 6R mean?
It is a second VW number shown on this module, alongside the main number 03P906021B and Delphi number 28317442. The unit comes from a 2011 Polo 6R 1.2 TDI, and it is worth comparing all three numbers.
Engine Control Unit Volkswagen Polo 6R 1.2 TDI Delphi 03P906021B 28317442 03P907425
What distinguishes this unit from other 03P906021B ECUs is Delphi number 28317442 and the additional VW number 03P907425. The module comes from a 2011 Volkswagen Polo 6R 1.2 TDI and controls fuel injection and boost on the diesel engine. Without a working ECU the engine will not start.
Numbers of this unit
- 03P906021B – Volkswagen part number – the main one for matching
- 28317442 – Delphi number
- 03P907425 – second VW number from the label
03P906021B ECUs come with different Delphi numbers – we have several of them in stock. So compare not only the VW number with the letter B, which indicates the version, but also the Delphi number and 03P907425.
Fault symptoms
- the Polo 6R will not start although the starter motor works,
- limp mode and reduced power,
- no connection to the module during diagnostics,
- a fault after water ingress or a voltage spike.
First check the ECU's power supply, earths and connector. On the Polo 6R it is also worth inspecting the wiring loom near the module for chafing and moisture, as a damaged wire produces symptoms similar to an electronics failure.
Choosing an option
In the locked option the module holds the data and immobiliser of the donor Polo 6R and goes to workshops that will unlock, program and adapt it themselves. In the unlocked option we prepare it before dispatch – usually within 1–2 working days.
Whether PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone can be used depends on the part number, software and immobiliser. Please ask before you buy. Description: engine control unit options.
Questions and answers
| Is every 03P906021B the same? |
|---|
| No. The units differ in their Delphi number – this one has 28317442 and the additional number 03P907425. |
| Will the locked version start the engine? |
| Not without being unlocked, programmed and adapted to the immobiliser. |
| What condition is this ECU in? |
| It is a used, fully working part 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 check whether the numbers match.
