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 Audi 1.6 FSI Bosch 03C906056AE 0261S02021
Vendors's code: 0261S02021
Product code: 03C906056AE
Barcode:
Code 39:
ISBN:
813,01 zł
Price
813,01 zł
1 000,00 zł
Price
1 000,00 zł
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 Audi 1.6 FSI Bosch 03C906056AE 0261S02021
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shipping
(Poland)
from
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(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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What does the number 03C906056AE on an engine control unit mean?
Used, working Bosch engine control unit 0261S02021 (VAG number 03C906056AE) for petrol engines, for Audi 1.6 FSI. Match it by the numbers on the housing – you choose the locked or unlocked version when ordering.
Engine control unit 0261S02021 – Audi 1.6 FSI
An engine control unit for petrol engines collects sensor data and uses it to run the powertrain. This one, Bosch 0261S02021, comes from an Audi and is used, working and in good condition.
Part numbers to compare
- 0 261 S02 021 / 0261S02021 – Manufacturer part number (Bosch)
- 03C 906 056 AE / 03C906056AE – VAG group part number
Remove the cover of the control unit in your car and read the label: look for 0261S02021 or 03C906056AE. The spaced form (e.g. 0 261 S02 021) is the same number.
When does an engine control unit start causing trouble?
Typical symptoms are rough running, jerking, ignition or throttle errors, an engine warning light, limp mode and no communication with diagnostics. Before replacing the unit, check the power supply, grounds and wiring – the control unit is not always the cause.
Locked or unlocked version?
A locked unit still carries the data and immobiliser of the previous car – it suits workshops that unlock, program and match the part themselves. We prepare an unlocked unit before dispatch (about 1–2 working days). Not every unlocking method is available for every unit – it depends on the number, software and immobiliser, so ask before buying if in doubt. Details: engine ECU preparation options.
Questions about this control unit
| Is 0261S02021 the same as 03C906056AE? | They are two numbers of the same part: 0261S02021 was assigned by the manufacturer (Bosch), while 03C906056AE is the VAG group number. The housing usually shows both, and one of them is enough for comparison. |
| How do I know the control unit is the faulty part? | Read the fault codes first and check the power supply, grounds, fuses and wiring. The unit is often fine and the problem lies in sensors or wiring. |
| Is this control unit new? | No, it is a used part removed from a vehicle, working and in good condition. |
Questions, or want to confirm the fit? Write to contact@auto24parts.com. See also: engine control units for Audi and all engine control units.
