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.
MMI 2G Video Head Unit Audi A6 C6, A8 D3, Q7 Becker 4E0035729A 4F0910731A
Vendors's code: 4E0035729A
Product code: 9DA5-794DD
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
Ask about the product
MMI 2G Video Head Unit Audi A6 C6, A8 D3, Q7 Becker 4E0035729A 4F0910731A
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MMI 2G head unit 4E0035729A – does it fit your Audi?
This is a used, working MMI 2G head unit, Video version, made by Becker, Audi number 4E0035729A, software number 4F0910731A. Before buying, compare the numbers with the label on the unit in your Audi A6 C6, A8 D3 or Q7.
MMI 2G Video Head Unit Audi Becker 4E0035729A
The head unit is the central component of the Audi MMI 2G system – the label describes it as “HU Video”. It is not mounted in the dashboard but elsewhere in the car. This Becker unit (model BE 6351) was used in the Audi A6 C6, A8 D3 and Q7.
Part numbers to compare
- 4E0035729A – Audi number, on the label: 4E0 035 729 A
- 4F0910731A – software number, on the label: 4F0 910 731 A
- BE6351 – Becker model, on the label: BE 6351
You will find all the numbers on the label on the unit housing. Choose the part by the full Audi number 4E0035729A – MMI units in different versions look alike but have different numbers.
Symptoms of a faulty MMI head unit
When the MMI head unit starts to fail, the most common symptoms are:
- no picture on the MMI display,
- the MMI system does not start or restarts by itself,
- no sound from the audio system,
- no communication with the unit during diagnostics.
Before replacing it, read the fault codes with a diagnostic tool and check the fuses, power supply, earth connection and connectors of the unit – a damaged connector or wiring harness causes similar symptoms. After replacement, the unit may need to be coded / adapted with a diagnostic tool (component protection).
Frequently asked questions
| Which car does the MMI head unit 4E0035729A fit? |
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| This unit was fitted to the Audi A6 C6, A8 D3 and Q7. Match it by the Audi number 4E0035729A – compare it with the label on the unit in your car. |
| What do the numbers on the label mean? |
| 4E0035729A (on the label 4E0 035 729 A) is the Audi part number, 4F0910731A (4F0 910 731 A) is the software number and BE 6351 is the model of the manufacturer Becker (Harman/Becker). |
| Does the unit need coding after fitting? |
| The unit may need to be coded / adapted with a diagnostic tool, including component protection – this depends on the version and equipment of the car. |
| What condition is this unit in? |
| It is a used part in good working condition. The warranty period is shown in the product specification table. |
Not sure whether this unit fits your car? Send us a photo of the label on your old unit and we will check compatibility.
