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 1.4 Magneti Marelli MY 4HV.CN 03C906024CN
Vendors's code: 03C906024CN
Product code: 03C906024CN
Barcode:
Code 39:
ISBN:
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 Polo 1.4 Magneti Marelli MY 4HV.CN 03C906024CN
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Shipping
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
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Looking for a 03C906024CN ECU for your Volkswagen Polo 1.4?
This used, working Magneti Marelli engine control unit from the MY 4HV.CN family carries VW number 03C906024CN and comes from a Volkswagen Polo with a 1.4 petrol engine. You can buy it locked or unlocked.
Engine Control Unit Volkswagen Polo 1.4 Magneti Marelli MY 4HV.CN 03C906024CN
The 1.4 petrol engine in the Volkswagen Polo runs under the supervision of this Magneti Marelli ECU. The module from the MY 4HV.CN family is responsible for fuel quantity, ignition timing, throttle operation and idle speed, and it also stores the fault codes read during diagnostics. The Volkswagen part number is 03C906024CN.
Numbers on the label
- 03C906024CN – VW part number, the main key to compatibility
- BC.0105008.D – additional marking on the ECU
- MY 4HV.CN – Magneti Marelli ECU type
Compare the number on the sticker on your ECU casing with 03C906024CN. The last letters (here CN) indicate the software or hardware version, so an ECU with a different ending will not necessarily replace this module.
When the ECU may be faulty
- the starter turns but the engine will not start, even though the ignition and fuel pump are working,
- diagnostics cannot connect to the engine ECU,
- uneven idling and stalling with no fault in the throttle body or sensors,
- the failure appeared after water ingress, a voltage surge or failed programming.
First inspect the connector, earths and the fuses supplying the module – corrosion in the wiring loom produces very similar symptoms.
Locked or unlocked – which to choose?
There are two versions to choose from. The locked version reaches you with the data and immobiliser of the car it came from – the option for workshops that will unlock, program and adapt the ECU themselves. We prepare the unlocked version before dispatch, usually within 1–2 working days.
The preparation method (PIN / CAR PASS, Virgin, IMMO OFF, auto programming, clone) depends on the number, software and immobiliser, so not every method is available for this module – please ask before buying. Description of all options: ECU preparation options.
Questions and answers
| Do I need to compare BC.0105008.D in the same way as 03C906024CN? |
|---|
| The most important is the VW number 03C906024CN. It is worth including the second marking from the label in your enquiry – it helps confirm the version. |
| Will the Polo start straight away after fitting the locked version? |
| No. The locked version needs programming and adaptation to the immobiliser in a workshop. |
| What condition is the ECU in? |
| Used, working and in good condition. You will find the warranty period in the product features table. |
Questions about this Magneti Marelli ECU? Email contact@auto24parts.com and attach a photo of your module's label.
