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, Seat 03E906033D 5WP4012104
Vendors's code: 5WP4012104
Product code: 5WP4012104
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, Seat 03E906033D 5WP4012104
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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 on the ECU casing is the number 03E906033D?
VW number 03E906033D and number 5WP40121 04 are on the label on the unit's casing. We sell a used petrol engine control unit in working order for Volkswagen and Seat vehicles.
Engine Control Unit Volkswagen, Seat 03E906033D 5WP4012104
This engine control unit comes from a Volkswagen or Seat with a petrol engine. The data does not give the model, engine size or family, so only the numbers count when matching: VW 03E906033D and 5WP4012104. 5WP numbering is used by Siemens VDO / Continental. The unit controls injection and ignition and keeps the idle speed stable. When it fails, the engine usually won't start.
Numbers to compare
- 03E906033D – Volkswagen part number
- 5WP4012104 – manufacturer number, shown on the label as 5WP40121 04
The label is usually on the flat part of the casing. The letter D at the end of the VW number identifies the unit version – your vehicle may have a 03E906033 ECU with a different letter, in which case compatibility needs to be checked separately.
Symptoms of a faulty ECU
- no start despite working ignition and fuel pump,
- the engine cuts out by itself when stationary,
- engine warning light and limp mode,
- no connection to the unit during diagnostics.
First check the ECU's power supply and earths, and the condition of the plug – the most common source of similar symptoms.
Locked or unlocked
The locked option is an ECU with the data and immobiliser of the vehicle it came from; it is chosen by workshops that unlock, program and match it themselves. The unlocked option is prepared before dispatch, usually within 1–2 working days.
Not every method – PIN / CAR PASS, Virgin, IMMO OFF, auto programming, cloning – is possible for this part number; it depends on the software and immobiliser. Please ask before buying. Description: ECU preparation options.
Questions and answers
| Which model does 03E906033D fit? |
|---|
| The data does not specify a model – match it by the number on your ECU. |
| Is 5WP40121 04 the same number as 5WP4012104? |
| Yes, it is just written differently on the label. |
| Will the locked version work straight away? |
| No, it has to be programmed and matched to the immobiliser. |
| What condition is the ECU in? |
| Used, in working order and in good condition. You will find the warranty period in the product features table. |
Send a photo of the label to contact@auto24parts.com – we'll check compatibility.
