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 1.9 TDI Bosch 028906021JC 0281001796
Vendors's code: 0281001796
Product code: 0281001796
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
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 Passat 1.9 TDI Bosch 028906021JC 0281001796
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€30.00
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(Poland)
from
€30.00
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(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 the 028906021JC ECU for a Passat 1.9 TDI?
This Bosch module numbered 0281001796 comes from a Volkswagen Passat with the 1.9 TDI engine. It is used and fully working; the JC suffix in the VW number confirms the match.
Engine Control Unit Volkswagen Passat 1.9 TDI Bosch 028906021JC 0281001796
The JC suffix distinguishes this ECU from many other modules in the 028906021 series fitted to diesel Volkswagens. This unit comes from a Passat 1.9 TDI and carries Bosch number 0281001796. It controls the fuel quantity, injection timing and boost, and without it the engine will not run.
How to identify this ECU
- 028906021JC – Volkswagen part number with version suffix JC
- 0281001796 – Bosch number, shown on the label as 0 281 001 796 – a diesel ECU
Compare the full number 028906021JC with the label, including the letters at the end. This suffix defines the software or hardware version, so a 028906021 module with different letters is not necessarily interchangeable.
Typical symptoms of a faulty ECU
- the 1.9 TDI engine will not fire although fuel is getting through,
- limp mode with no sensor fault stored,
- the diagnostic tool cannot connect to the engine module,
- a fault after moisture got into the ECU or a voltage spike.
Before buying a module, inspect the connector and earth leads – corrosion causes very similar symptoms.
How we prepare the ECU
You can order the module unlocked – we prepare it before dispatch, usually within 1–2 working days. Alternatively, choose locked, which holds the data and immobiliser from the previous Passat; this option is for workshops that will unlock, program and adapt it themselves.
The availability of PIN / CAR PASS, Virgin, IMMO OFF, auto programming and clone depends on the part number, software and immobiliser. Before you buy, ask what is possible for your car. Details: engine control unit options.
Questions and answers
| Are 028906021JC and 0281001796 two different ECUs? |
|---|
| No, it is one module identified by a Volkswagen number and a Bosch number. |
| What if I have a 028906021 with a different suffix? |
| That is a different version. Send us a photo of the label and we will check whether it can be swapped. |
| 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. |
Email contact@auto24parts.com with the numbers from your label – we will tell you whether this ECU fits.
