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, Audi A4, Audi A6 Bosch 8D0907401B 0261001811
Vendors's code: 0261001811
Product code: 0261001811
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
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, Audi A4, Audi A6 Bosch 8D0907401B 0261001811
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Looking for an 8D0907401B ECU for an Audi A4, Audi A6 or Volkswagen?
We offer a used Bosch engine control unit in working order, number 8D0907401B (Bosch 0 261 001 811), used in Volkswagen as well as Audi A4 and Audi A6 models with petrol engines.
Engine Control Unit Volkswagen, Audi A4, Audi A6 Bosch 8D0907401B 0261001811
Audi A4, Audi A6 and Volkswagen with petrol engines – according to the data, these vehicles were fitted with the Bosch ECU numbered 8D0907401B. Bosch number 0261001811, with its 0 261 prefix, confirms that this is a petrol engine unit. The ECU manages injection and ignition, and when it fails it usually leaves the vehicle immobilised. The data does not give the engine size or family, so base your match on the numbers. On older vehicles it is worth inspecting the wiring loom near the ECU while you are replacing it.
Numbers to compare
- 8D0907401B – Audi / Volkswagen part number
- 0261001811 – Bosch number, shown on the label as 0 261 001 811
The letter B at the end of 8D0907401B is the unit version. An ECU with a different letter may have different software, so compare the full number with the unit in your vehicle.
Symptoms of a faulty ECU
- the engine cranks but won't fire,
- no spark or injection although the sensors are working,
- erratic revs and stalling,
- no response from the unit during diagnostics.
First check the relay and fuses supplying the ECU and make sure the connector contacts are clean.
ECU versions
A locked unit holds the data and immobiliser of the previous vehicle – for workshops that unlock, program and match it themselves. An unlocked unit is prepared before dispatch, normally within 1–2 working days.
Methods such as PIN / CAR PASS, Virgin, IMMO OFF, auto programming or cloning are not always possible – it depends on the part number, software and immobiliser. Please ask before buying. Details: ECU preparation options.
Questions and answers
| Does 8D0907401B fit every Audi A4 and A6? |
|---|
| No. Different ECUs were used in these models – the number on your unit is what decides. |
| What does 0 261 001 811 mean? |
| It is Bosch number 0261001811 written in the label format. |
| What condition is the 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. |
Any questions? Email contact@auto24parts.com and include the numbers from the label.
