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 037906025K 5WP4207
Vendors's code: 5WP4207
Product code: 037906025K
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
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Engine Control Unit Volkswagen Passat 1.6 Siemens 037906025K 5WP4207
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Does the 037906025K ECU fit a Volkswagen Passat 1.6?
It does, if your current module has the same VW number 037906025K and Siemens number 5WP4207. This is a used, working engine control unit from a petrol Volkswagen Passat 1.6.
Engine Control Unit Volkswagen Passat 1.6 Siemens 037906025K 5WP4207
A petrol Volkswagen Passat 1.6 with this ECU uses a Siemens module numbered 5WP4207. In the Volkswagen catalogue it is listed as 037906025K. The unit controls the injectors, ignition and idle speed, and when it fails the most common result is a no-start.
Numbers of this ECU
- 037906025K – VW part number
- 5WP4207 – Siemens number (Siemens VDO / Continental numbering)
The letter K at the end of the VW number indicates the version. A 037906025 ECU with a different letter may have different software – compare the full number before buying.
Symptoms worth watching for
- no start even though the starter motor works,
- uneven revs and stalling at idle,
- no control of the injectors or coil,
- the module does not respond to the diagnostic tester.
First rule out faults in the power supply, earths and connector. Only when the wiring is sound and the symptoms persist is it worth ordering an ECU with the same VW and Siemens numbers.
Preparation options
You can choose a locked or an unlocked version. The first contains the data and immobiliser of the previous Passat – the workshop unlocks, programs and adapts it itself. We prepare the second before dispatch, usually within 1–2 working days.
PIN / CAR PASS code, Virgin version, IMMO OFF, auto programming, cloning – what is feasible depends on the number, software and immobiliser. Please ask before ordering. More: ECU preparation options page.
Questions and answers
| Will the 037906025K ECU start the car straight away? |
|---|
| The locked version will not – it needs programming and adaptation. With the unlocked version it depends on the preparation method agreed before purchase. |
| Are 5WP4207 and 037906025K the same module? |
| Yes – they are the Siemens number and the VW number of one and the same ECU. |
| What should I send before ordering? |
| A photo of the label on your current ECU, or the VW and Siemens numbers copied from it. We will check compatibility and the available preparation options. |
| 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. |
Please send any questions to contact@auto24parts.com.
