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 6R 1.4 16V Magneti Marelli MY2 4HV.BH 03C906024BH
Vendors's code: 03C906024BH
Product code: 03C906024BH
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
Ask about the product
Engine Control Unit Volkswagen Polo 6R 1.4 16V Magneti Marelli MY2 4HV.BH 03C906024BH
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How does the 03C906024BH ECU differ from other 03C906024 modules from the Polo?
The difference lies in the BH ending – a version tied to specific software and equipment. This used, working Magneti Marelli MY2 4HV.BH module comes from a Polo 6R with a 1.4 16V engine.
Engine Control Unit Volkswagen Polo 6R 1.4 16V Magneti Marelli MY2 4HV.BH 03C906024BH
The Polo 6R with the 1.4 16V petrol engine uses Magneti Marelli ECUs from the MY2 series. This unit is version 4HV.BH with VW number 03C906024BH. The ECU calculates the fuel quantity and ignition timing, monitors the throttle and lambda sensors, and communicates with the car's other modules. When it fails, the Polo often will not move at all or only runs in limp mode.
Numbers to check
- 03C906024BH – Volkswagen part number
- BC.0097381.F – second marking on the label
- MY2 4HV.BH – Magneti Marelli ECU type
03C906024 ECUs come in many letter versions. For your Polo 6R, choose a module with an identical ending – BH in this case – because the installed software depends on it.
When the ECU fails
- the engine cranks but will not fire,
- the car goes into limp mode and loses power,
- unstable idle speed,
- no communication with the ECU during diagnosis.
Before replacing it, check the connector pins and power supply – an oxidised pin can cause the same symptoms.
How we prepare the ECU
You have two options. We prepare an unlocked module before the parcel is sent, which usually takes 1–2 working days. A locked one arrives with the data and immobiliser of the donor car – for workshops that will unlock and adapt it themselves.
Methods such as PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone are not always available – it depends on the number, software and immobiliser. Before buying, ask what is possible. Full description: ECU preparation options.
Questions and answers
| Will a 03C906024 with a different letter fit? |
|---|
| Not without checking – a different letter usually means different software. Send us your module's number. |
| Will the locked version start the car after fitting? |
| No, it needs programming and adaptation to the immobiliser. |
| What condition is the ECU in? |
| Used, working and in good condition. You will find the warranty period in the product features table. |
Send questions about the 03C906024BH ECU to contact@auto24parts.com.
