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 2.0 Siemens 037906022CL 5WP4021
Vendors's code: 5WP4021
Product code: 5WP4021
Barcode:
Code 39:
ISBN:
€203.25
Price
€203.25
€250.00
Price
€250.00
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 2.0 Siemens 037906022CL 5WP4021
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from
€30.00
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shipping
(Poland)
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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How can I check whether the 037906022CL ECU fits a Passat 2.0?
The easiest way is to compare the label: your unit should show VW number 037906022CL and Siemens number 5WP4021. This used, working Siemens engine control unit comes from a Volkswagen Passat with a 2.0 petrol engine.
Engine Control Unit Volkswagen Passat 2.0 Siemens 037906022CL 5WP4021
The letters at the end of the number 037906022 distinguish the ECU versions – this unit from a Volkswagen Passat 2.0 (petrol) is the CL variant. The manufacturer is Siemens – number 5WP4021 belongs to the Siemens VDO / Continental numbering system. The unit reads the sensor signals and uses them to control fuel injection and ignition.
Numbers to compare
- 037906022CL – VW part number
- 5WP4021 – Siemens number
The CL ending is the software or hardware version designation. A 037906022 ECU with a different suffix may require different software, which is why a match of the full number matters more than engine size alone.
Symptoms of a faulty ECU
- the engine will not start despite working ignition and fuel supply,
- stored faults indicating an internal module fault,
- the engine stalls once warmed up,
- no communication with the tester.
Before ordering an ECU, check the power supply and earths – the cause may also be a faulty relay or a chafed wire in the loom near the unit. Measuring the voltage at the connector takes a few minutes and can save you an unnecessary purchase.
Choose your version
The locked version keeps the data and immobiliser of the Passat it came from – the workshop will unlock, program and match it themselves. The unlocked version leaves us already prepared; preparation usually takes 1–2 working days before dispatch.
The possible methods (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) depend on the part number, software and immobiliser – not every method is available. Please ask before you buy. Description: ECU preparation options.
Questions and answers
| Does the 037906022CL fit every Passat 2.0? |
|---|
| Do not assume so in advance. What decides is the full number including the letters CL, not the engine size alone – compare it with the label. |
| Where should I look for the number 5WP4021? |
| On the Siemens label on the ECU casing, next to the VW number. |
| What condition is the ECU in? |
| It is a used, working part in good condition. You will find the warranty period in the product specification table. |
Email contact@auto24parts.com with the numbers from your ECU – we will help you find the right part.
