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 Golf Siemens 06A906033M 5WP4003702
Vendors's code: 5WP4003702
Product code: 5WP4003702
Barcode:
Code 39:
ISBN:
€101.63
Price
€101.63
€125.00
Price
€125.00
Ask about the product
Engine Control Unit Volkswagen Golf Siemens 06A906033M 5WP4003702
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Does the 06A906033M ECU fit your Volkswagen Golf?
This used, working Siemens engine control unit carries VW number 06A906033M and manufacturer number 5WP4003702 (on the label: 5WP40037 02). It fits a petrol Golf that left the factory with a unit bearing the same numbers – check them on the casing of your ECU.
Engine Control Unit Volkswagen Golf Siemens 06A906033M 5WP4003702
Number 06A906033M belongs to a petrol engine ECU that Siemens supplied for the Volkswagen Golf. The unit reads the sensor signals, sets the fuel quantity and ignition timing, and keeps the idle stable. The marking 5WP4003702 is the number assigned by the unit's manufacturer – useful when the VW number on the label is hard to read.
Numbers to compare
- 06A906033M – VW part number
- 5WP4003702 – Siemens manufacturer number, printed on the label as 5WP40037 02
The letter M at the end of the VW number indicates a specific hardware and software version. An ECU with the same 06A906033 base but a different letter may not work with your car, so compare the full number.
When an engine ECU may be faulty
- the engine cranks on the starter but will not start despite spark and fuel,
- the diagnostic tester cannot establish a connection with the ECU,
- rough running and stalling at idle with no sensor fault,
- no activation of the injectors or coils on one or more cylinders.
First check the fuses, main power relay and engine earths – faults there produce very similar symptoms.
How we prepare the ECU for your car
You can choose one of two versions. We prepare the unlocked unit in-house before dispatch – this usually takes 1–2 working days. The locked unit reaches you with the data and immobiliser of the previous Golf; it is chosen by workshops that will unlock, program and match it themselves.
The unlocking method (PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone) depends on the part number, software and immobiliser, so not every method is available for 06A906033M. Please ask us before you buy. We describe the details on the ECU preparation options page.
Questions and answers
| Are 5WP4003702 and 06A906033M the same unit? |
|---|
| Yes. The first number was assigned by Siemens, the second is the Volkswagen part number – both appear on the same ECU. |
| Is any adaptation needed after fitting? |
| With the locked version, yes – it has to be programmed and matched to the immobiliser. With the unlocked version, we agree the scope of work after fitting before you buy. |
| What condition is the ECU in? |
| Used, working, in good condition. You will find the warranty period in the product specification table. |
Questions about the number or the version? Email contact@auto24parts.com and attach a photo of the label on your ECU.
