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 1.6 Siemens 3B0907557 5WP4350
Vendors's code: 5WP4350
Product code: 5WP4350
Barcode:
Code 39:
ISBN:
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 1.6 Siemens 3B0907557 5WP4350
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€30.00
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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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The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
How can I check whether the 3B0907557 ECU will fit my Passat 1.6?
Check that the label on your module shows VW number 3B0907557 with no letter at the end, and Siemens number 5WP4 350. This used, working Siemens engine control unit comes from a petrol Volkswagen Passat 1.6.
Engine Control Unit Volkswagen Passat 1.6 Siemens 3B0907557 5WP4350
On this unit the VW number 3B0907557 has no version letter – which matters, because we also offer 3B0907557 modules with the letters C and D. The ECU was made by Siemens (number 5WP4350) and worked in a Volkswagen Passat with a 1.6 petrol engine, where it was responsible for fuel injection and ignition.
Numbers of this module
- 3B0907557 – VW part number, with no letter at the end
- 5WP4350 – Siemens number, shown on the sticker as 5WP4 350
The absence of a letter is information too: it identifies a specific ECU version. Variants with a letter may have different software, so do not treat them as replacements without checking with us. If the label is illegible, send us a photo of it – we will help read the numbers and assess whether this module is suitable.
Symptoms of a faulty ECU
- the engine cranks but will not start,
- the engine suddenly cuts out while driving,
- no fuel pump activation after switching on the ignition,
- no communication with the module during diagnostics.
Before replacing it, check the earths, power supply and connector – and if the car has been flooded, also inspect the area where the module is mounted.
Locked or unlocked version
You can order this ECU unlocked – we will prepare it before dispatch, usually within 1–2 working days – or locked. The locked version contains the data and immobiliser of the previous car; the workshop then carries out the unlocking, programming and adaptation.
PIN / CAR PASS, Virgin, IMMO OFF, auto programming and clone methods are not always possible – it depends on the number, software and immobiliser. Please ask before buying. More information: ECU preparation options.
Questions and answers
| Can 3B0907557 replace 3B0907557C? |
|---|
| They are different ECU versions. Choose a module with a number identical to the one on your label, or check the swap with us. |
| What does 5WP4 350 mean? |
| It is the Siemens number 5WP4350, split by a space on the label. |
| What condition is the ECU in? |
| It is a used part, working and in good condition. You will find the warranty period in the product features table. |
Want to confirm compatibility? Email contact@auto24parts.com.
