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 Bosch MED17.5.5 03C906027CR 0261S06642
Vendors's code: 0261S06642
Product code: 23CF-45572
Barcode:
Code 39:
ISBN:
$496.23
Price
$496.23
$610.36
Price
$610.36
In stock
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 Bosch MED17.5.5 03C906027CR 0261S06642
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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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Will ECU 03C906027CR fit your Volkswagen?
It will if the label on your current unit shows the same VW number 03C906027CR and Bosch number 0261S06642 – the car model alone is not enough to find the right part. We offer a used, working Bosch MED17.5.5 ECU for a petrol engine.
Engine Control Unit Volkswagen Bosch MED17.5.5 03C906027CR 0261S06642
The Bosch MED17.5.5 is a Motronic-family ECU designed for direct-injection petrol engines. Using sensor readings, the unit with VW number 03C906027CR calculates the fuel quantity, ignition timing and throttle position. We do not assign it to a specific Volkswagen model here – the numbers on the label decide whether it will replace your unit.
Numbers to compare
- 03C906027CR – VW part number
- 0261S06642 – Bosch number, shown on the label as 0 261 S06 642
- MED17.5.5 – Bosch ECU family
Above all, compare the suffix of the VW number. The letters CR indicate a specific software and hardware version, so a 03C906027 unit with a different suffix is not automatically a replacement.
When to suspect a faulty ECU
- the starter turns but the engine will not start, even though the fuel pump and ignition are working,
- the diagnostic tool cannot communicate with the engine unit,
- the engine warning light stays on and the car goes into limp mode,
- no control of the injectors or coils on one or more cylinders.
First measure the supply voltage and inspect the earths and connectors – corrosion on the pins can cause exactly the same symptoms.
Locked or unlocked version
You can order this 03C906027CR ECU in one of two versions. The locked unit reaches you with the data and immobiliser from the previous car – it is intended for workshops that will unlock, program and match it themselves. We prepare the unlocked unit before dispatch, which usually takes 1–2 working days.
Not every method – PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone – will work on every unit. This depends on the part number, software version and immobiliser, so please ask us before you buy. More information: engine control unit variants.
Questions and answers
| Are 0261S06642 and 03C906027CR the same ECU? |
|---|
| Yes. The first number is assigned by Bosch, the second by Volkswagen – both describe the same MED17.5.5 unit. |
| Will the engine start straight away after fitting the locked version? |
| No. Such a unit needs to be unlocked, programmed and matched to the car's immobiliser. |
| What condition is this ECU in? |
| It is a used part, working and in good condition. You will find the warranty period in the product features table. |
Have a question about compatibility or unlocking? Email contact@auto24parts.com and attach a photo of your ECU label.
