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, Seat, Skoda Magneti Marelli IAW 4TV.JQ 036906034JQ
Vendors's code: 036906034JQ
Product code: 036906034JQ
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, Seat, Skoda Magneti Marelli IAW 4TV.JQ 036906034JQ
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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
Shipping cost for the selected product
The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
What does IAW 4TV.JQ on the 036906034JQ ECU mean?
It is the Magneti Marelli ECU type designation, while 036906034JQ is the VW part number. This used petrol engine unit in working order was used in Volkswagen, Seat and Skoda models.
Engine Control Unit Volkswagen, Seat, Skoda Magneti Marelli IAW 4TV.JQ 036906034JQ
When a petrol engine refuses to start and diagnostics cannot see the ECU, a faulty unit may be the cause. This Magneti Marelli IAW 4TV.JQ ECU, VW number 036906034JQ, is intended for Volkswagen, Seat and Skoda vehicles. It controls injection and ignition using data from the sensors.
How to identify this ECU
- 036906034JQ – VW part number
- IAW 4TV.JQ – Magneti Marelli ECU type
For this unit we give the VW number and the ECU type. The letters JQ at the end denote the version – a unit with the same base number but a different suffix will not necessarily fit.
When the ECU may be faulty
- the car cuts out straight after starting or won't start at all,
- no spark or injection on one or more cylinders despite working coils and injectors,
- intermittent communication with diagnostics,
- signs of moisture, corrosion or a voltage surge at the connector.
Before ordering the unit, inspect the plug and wiring loom – corroded contacts can mimic an ECU failure.
Locked or unlocked
We sell this ECU in two versions. Locked – untouched, with the previous vehicle's data and immobiliser; chosen by workshops that do the unlocking, programming and matching in-house. Unlocked – prepared before dispatch, usually within 1–2 working days.
Which method is an option (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, cloning) depends on the part number, software and immobiliser. Contact us before buying and we'll check. You will find the full description on the page ECU preparation options.
Questions and answers
| How do I match the ECU if I can't see a Marelli number? |
|---|
| The VW number from the label is enough. If the label is illegible, send a photo – we'll help you read the markings. |
| Is adaptation needed after replacing the ECU? |
| Usually, yes – after fitting, it is worth carrying out the matching and checking the fault memory. The scope of work depends on the version you choose; we'll advise before you buy. |
| Is the ECU new? |
| No – it is a used unit, in working order and in good condition. You will find the warranty period in the product features table. |
We're happy to help you choose – email contact@auto24parts.com and give us all the numbers from the casing of your current unit.
