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 Passat Bosch 028906021DT 0281001555
Vendors's code: 0281001555
Product code: 0281001555
Barcode:
Code 39:
ISBN:
$83.18
Price
$83.18
$102.31
Price
$102.31
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 Passat Bosch 028906021DT 0281001555
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Shipping
from
$30.69
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shipping
(Poland)
from
$30.69
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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.
Will the 028906021DT ECU fit your Volkswagen Passat?
Yes, if your module carries VW number 028906021DT and Bosch number 0281001555. The data for this unit also lists a second Bosch number, 0281001556 – it is worth checking whether it appears on your label.
Engine Control Unit Volkswagen Passat Bosch 028906021DT 0281001555
What makes this unit from a Volkswagen Passat stand out is that, in addition to VW number 028906021DT, it has two Bosch numbers assigned: 0281001555 and 0281001556. Both start with 0 281, the prefix for diesel engine ECUs. The module controls fuel injection and the running of the diesel engine, receiving signals from the sensors.
Numbers of this module
- 028906021DT – Volkswagen part number; the letters DT indicate the version
- 0281001555 – Bosch number, written on the label as 0 281 001 555
- 0281001556 – second Bosch number assigned to this unit
The most important thing is a matching VW number including the DT suffix, as the letters describe the software or hardware version. Treat the Bosch numbers as confirmation – if either of them appears on your label, send us a photo and we will compare everything.
What to look out for before replacing
- the Passat will not start although the starter motor works,
- rough running or stalling with no fault in the pump,
- no communication with the ECU on the diagnostic tool,
- damage after water ingress or a voltage spike in the electrical system.
First check the module's power supply and earths as well as the condition of the connector – it is quicker and cheaper than replacing the ECU.
Two versions to choose from
A locked ECU retains the data and immobiliser of the Passat it came from. It is bought by workshops that will unlock, program and adapt it themselves. We prepare an unlocked ECU before dispatch – this usually takes 1–2 working days.
Each method (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) has its own limitations depending on the part number, software and immobiliser, so please ask about it before you buy. See also the description of engine control unit options.
Questions and answers
| Why does 028906021DT have two Bosch numbers? |
|---|
| Both are assigned to this unit. The VW number is the most important for matching, and the Bosch numbers help to confirm compatibility. |
| Can I fit the locked module without programming? |
| No. The locked version needs to be 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 your ECU's label to contact@auto24parts.com – we will check the numbers before dispatch.
