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 Fox 1.4 Siemens VDO 03D906023B 5WP40800
Vendors's code: 5WP40800
Product code: 5WP40800
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 Fox 1.4 Siemens VDO 03D906023B 5WP40800
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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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Where can I find the number 03D906023B on an ECU from a Fox 1.4?
VW number 03D906023B and Siemens VDO number 5WP40800 are printed on the label on the ECU casing. If both match your unit, you can order this used, working unit – locked or unlocked.
Engine Control Unit Volkswagen Fox 1.4 Siemens VDO 03D906023B 5WP40800
When a Fox 1.4 stops starting and the diagnostic tool cannot see the engine control unit, the unit itself is often the cause. We offer a used, working Siemens VDO ECU with VW number 03D906023B and manufacturer number 5WP40800 – the 5WP designation is Siemens VDO / Continental numbering. In the 1.4 petrol engine, it is responsible for injection and ignition.
Numbers to compare
- 03D906023B – VW part number
- 5WP40800 – Siemens VDO manufacturer number
The same VW number may appear with different Siemens numbers, so compare both. The letter B at the end of 03D906023B also matters – it denotes the software and hardware version.
Signs of a faulty engine control unit
- no start despite working ignition and fuel supply,
- no communication with the diagnostic tool,
- hunting idle and stalling with no sensor fault,
- internal unit faults stored in the fault memory.
Before removing the unit, inspect the connector and earth leads – a loose contact produces similar symptoms.
How do we prepare the ECU for dispatch?
You have two options. The first is a locked ECU, with the data and immobiliser of the previous car – it is bought by workshops that will unlock, program and match it themselves. The second is an unlocked ECU: we prepare it before dispatch, usually within 1–2 working days.
Not every method – PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone – will work on every unit; this depends on the part number, software and immobiliser. Before buying, ask what is possible for 03D906023B. Description of all options: Engine control unit (ECU) variants.
Questions and answers
| Will unit 5WP40800 replace an ECU with a different Siemens number? |
|---|
| Do not assume so. If the numbers on the label differ, send us a photo of the label – we will check compatibility. |
| Which engine is this ECU for? |
| We describe it as a unit for the Volkswagen Fox with the 1.4 petrol engine. |
| What condition is ECU 03D906023B in? |
| It is used, working and in good condition. You will find the warranty period in the product features table. |
If you are unsure about the numbers, write to contact@auto24parts.com – we will help before you buy.
