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 Magneti Marelli IAW 4LV.MA 036906034BF
Vendors's code: 036906034BF
Product code: 036906034BF
Barcode:
Code 39:
ISBN:
€243.90
Price
€243.90
€300.00
Price
€300.00
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 Magneti Marelli IAW 4LV.MA 036906034BF
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€30.00
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(Poland)
from
€30.00
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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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What does the number 036906034BF on a Magneti Marelli ECU mean?
036906034BF is the VW part number under which Volkswagen catalogued this petrol engine control unit from the Magneti Marelli IAW 4LV.MA family. The unit is used and in working order, available in a locked or unlocked version.
Engine Control Unit Volkswagen Magneti Marelli IAW 4LV.MA 036906034BF
In a petrol-engined Volkswagen, the Magneti Marelli IAW 4LV.MA ECU calculates the fuel quantity and ignition advance based on signals from the sensors. IAW is Magneti Marelli’s line of engine control units, and the number 036906034BF identifies the specific version used by Volkswagen. The car model does not decide compatibility here – the numbers on the label do.
Numbers to compare
- 036906034BF – VW part number
- IAW 4LV.MA – Magneti Marelli ECU type designation
The description of this unit has no separate manufacturer number, so compare above all the VW number together with the letters BF at the end. The letters denote the hardware or software version, and an ECU with a different ending may not work with your car.
Symptoms of a faulty engine ECU
- the engine cranks but will not start – no spark or injection even though the coils and injectors are fine,
- limp mode with reduced power that the sensor readings do not explain,
- interrupted or failed programming, after which the unit does not respond,
- the fuel pump or radiator fan is not switched on, although the components themselves work.
Before you order a new unit, check the fuses, power supply relay and engine earths.
Locked or unlocked – which variant to choose?
There are two versions to choose from. The locked one reaches you with the data and immobiliser of the previous car – it is chosen by workshops that will unlock, program and match the unit themselves. We prepare the unlocked one before dispatch, usually in 1–2 working days.
The preparation 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 the 036906034BF ECU. Ask about it before you buy. More information: ECU variants.
Questions and answers
| Will the car start straight away once the 036906034BF ECU is fitted? |
|---|
| Not with the locked version – the unit has to be unlocked, programmed and matched to the immobiliser. With the unlocked version it depends on the preparation method, which we agree before purchase. |
| How long does it take to prepare the unlocked version? |
| Usually 1–2 working days before dispatch. |
| Can I fit an ECU with a different final letter from 036906034BF? |
| We do not recommend it without consulting us. The letter denotes the hardware or software version, so a different ending may mean it is not compatible. |
| What condition is this ECU in? |
| It is a used part, in working order and in good condition. You will find the warranty period in the product features table. |
Not sure which variant to choose? Email contact@auto24parts.com and give us the numbers from the label on your ECU.
