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 Siemens 037906022FN 5WP4088
Vendors's code: 5WP4088
Product code: 5WP4088
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
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 Siemens 037906022FN 5WP4088
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€30.00
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from
€30.00
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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
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Looking for a 037906022FN ECU for your Passat?
This used, working Siemens engine control unit carries VW number 037906022FN and Siemens number 5WP4088. It comes from a petrol Volkswagen Passat – we do not state the engine size, because the numbers are what determine compatibility.
Engine Control Unit Volkswagen Passat Siemens 037906022FN 5WP4088
Here the starting point is the number, not the engine: our data for the 037906022FN module gives no engine size, but it does give a Volkswagen Passat with a petrol engine and the manufacturer – Siemens. The number 5WP4088 is Siemens VDO / Continental numbering. The ECU manages fuel injection and ignition.
Numbers on the casing
- 037906022FN – VW part number
- 5WP4088 – Siemens number
The letters FN distinguish this ECU from other 037906022 versions. Only order it if the module in your Passat has an identical number, or after checking with us.
When the ECU may be faulty
- the engine will not start and the fuel pump does not run,
- the engine warning light stays on with a module fault,
- misfiring with no fault in the coils or spark plugs,
- no communication with the ECU during diagnostics.
Before replacing it, check the connector, wiring and fuses – they are often the real culprit. Also look for signs of moisture where the module is mounted, as water can damage both the connector and the electronics themselves.
ECU versions
When ordering, you choose one of two versions. We prepare an unlocked module in-house before dispatch – this usually takes 1–2 working days. A locked module contains the data and immobiliser of the previous car and is intended for workshops that will unlock, program and adapt it themselves.
For the 037906022FN, which methods are available (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) depends on the software and immobiliser, so please ask before buying. All options: ECU preparation options.
Questions and answers
| Which Passat engine size does this ECU fit? |
|---|
| We do not have that information. Compatibility is based on matching the 037906022FN number and the Siemens number to your label. |
| Is 5WP4088 a Siemens number? |
| Yes, 5WP numbers are Siemens VDO / Continental numbering. |
| What condition is the module in? |
| It is a used part, working and in good condition. You will find the warranty period in the product features table. |
Send your question to contact@auto24parts.com – we will tell you whether this ECU fits your car.
