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 Polo Siemens 03D906033F 5WP4029803
Vendors's code: 5WP4029803
Product code: 5WP40298
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
Ask about the product
Engine Control Unit Volkswagen Polo Siemens 03D906033F 5WP4029803
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€30.00
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(Poland)
from
€30.00
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(Poland)
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Does the 03D906033F module with the 03 ending fit your Polo?
It does, if the label in your car shows the same VW number and Siemens number 5WP40298 03. This is a used, working petrol engine ECU from a Volkswagen Polo.
Engine Control Unit Volkswagen Polo Siemens 03D906033F 5WP4029803
This Siemens unit for the Volkswagen Polo has VW number 03D906033F and manufacturer number 5WP4029803, written on the label as 5WP40298 03. The ECU runs a petrol engine: it manages fuel delivery and ignition. Compare both numbers before buying, because a matching VW number alone may not be enough.
Identifying the module
- 03D906033F – Volkswagen (VW) part number
- 5WP4029803 – Siemens number, written on the label as 5WP40298 03
The letter F in the VW number and the 03 ending of the Siemens number together identify the version of this module. We do not state the engine size, so compatibility is decided by the numbers alone.
How to recognise an ECU fault
- the engine will not run at all, even though the power supply is fine,
- the engine warning light comes on intermittently and the faults return after clearing,
- incorrect control of the injectors or ignition coils,
- increased fuel consumption and rough idling.
Before buying, it is worth ruling out a weak battery, the main relay and the earth leads.
Versions available
When choosing the version, think about who will do the programming. If a workshop does it, a locked module is enough – it keeps the data and immobiliser from the previous car. If you would rather receive an ECU ready for the next steps, choose the unlocked version – we prepare it before dispatch, usually within 1–2 working days.
The unlocking methods (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) do not suit every ECU – it depends on the number, software and immobiliser. Before buying, ask what is possible for the 03D906033F. Description of the options: auto24parts.com – ECU preparation options.
Questions and answers
| Are 5WP4029803 and 03D906033F the same ECU? |
|---|
| Yes, they are two numbers of one module: 03D906033F is the VW number and 5WP4029803 is the Siemens number. |
| Does this module fit every Polo? |
| No. Different engine ECUs were used in this model, so compatibility is decided by the number on the label, not by the car model alone. |
| Where can I find the number 03D906033F? |
| On the sticker on the ECU casing. Copy all the numbers from the label, including the letters at the end. |
| Is there a warranty on the ECU? |
| Yes. We sell it used, working and in good condition. You will find the warranty period in the product features table. |
If in doubt, write to us at contact@auto24parts.com. Give us the numbers from the casing of your current module and we will advise on the version.
