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 Skoda 03P906021AN 28395189
Vendors's code: 28395189
Product code: 2A6A-267A1
Barcode:
Code 39:
ISBN:
€284.55
Price
€284.55
€350.00
Price
€350.00
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 Skoda 03P906021AN 28395189
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€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
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Looking for a 03P906021AN ECU for a diesel Skoda?
This used, fully working unit has VW number 03P906021AN and a second number, 28395189. It comes from a diesel Skoda; compatibility depends on both numbers matching the label on your ECU.
Engine Control Unit Skoda 03P906021AN 28395189
The 03P906021AN diesel engine control unit manages injection and the running of the diesel engine in a Skoda. The 906021 format in the VW number designates an engine control unit, and the unit also carries a second number, 28395189. Based on sensor signals, the unit sets the injection quantity and timing and controls engine operation in limp mode. We do not state the model or engine size – the numbers on the label decide compatibility, and you can easily compare them with your ECU. The unit is used, fully working and in good condition.
Numbers to compare
- 03P906021AN – VW/Skoda part number
- 28395189 – ECU manufacturer's number
The letters "AN" at the end of the VW number denote the software or hardware version. A 03P906021 unit with a different suffix may have different software, so compare the full number.
Symptoms of ECU failure
- the engine will not start or cuts out after a moment,
- loss of power and limp mode with no sensor fault,
- no response from the unit on the tester,
- fault codes appearing after a voltage surge or moisture ingress.
First check the power supply, earths and wiring loom – only then replace the unit itself.
Variant: locked or unlocked?
The unlocked version is the convenient option – we prepare the unit before dispatch, usually within 1–2 working days. The locked version is the choice for garages: the ECU holds the data and immobiliser of the previous car, and the mechanic unlocks, programs and adapts it themselves.
Whether it can be unlocked via PIN / CAR PASS, Virgin, IMMO OFF, auto-programming or clone depends on the part number, software and immobiliser – please ask before you buy. See: engine control unit variants.
Questions and answers
| Which Skoda model is the 03P906021AN ECU for? |
|---|
| We do not state the model. Compare the number with the label on your ECU. |
| What is the number 28395189? |
| It is the second number on the unit – the ECU manufacturer's number. |
| What condition is the unit in? |
| Used, fully working, in good condition. You will find the warranty period in the product specifications table. |
Send a photo of the label to contact@auto24parts.com – we will check whether this unit will replace yours.
