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 MED17.1 03C906021A 0261S04469
Vendors's code: 0261S04469
Product code: 0261S04469
Barcode:
Code 39:
ISBN:
€487.80
Price
€487.80
€600.00
Price
€600.00
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 Bosch MED17.1 03C906021A 0261S04469
Administratorem danych osobowych jest Auto24parts. Przetwarzamy je w celu przesłania odpowiedzi na zapytanie. Więcej informacji dotyczących przetwarzania danych osobowych znajduje się w polityce prywatności.
Shipping
from
€30.00
-
shipping
(Poland)
from
€30.00
-
shipping
(Poland)
Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
Shipping cost for the selected product
The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
What does the number 03C906021A on the ECU label mean?
It is the VW part number under which Volkswagen designated this Bosch MED17.1 ECU. The second number on the same label, 0261S04469, was assigned by Bosch – together they let you confirm the compatibility of this used, working unit.
Engine Control Unit Volkswagen Bosch MED17.1 03C906021A 0261S04469
The MED17 family consists of Bosch Motronic ECUs for direct-injection petrol engines. The 03C906021A unit in the MED17.1 version calculates the amount of fuel injected directly into the cylinders and controls the ignition, based on sensor signals. The unit comes from a Volkswagen and is used and in working order.
What to check on the sticker
- 03C906021A – VW number
- 0261S04469 – Bosch number, shown on the sticker as 0 261 S04 469
- MED17.1 – Bosch Motronic direct-injection family
The letter A at the end of the VW number defines the version. 03C906021 ECUs with a different ending may have different software, so compare the full number.
Symptoms of a faulty engine ECU
- limp mode with reduced power that the sensor readings do not explain,
- interrupted or failed programming, after which the unit does not respond,
- fuel pressure control faults even though the high-pressure pump and sensor are fine,
- engine warning light with internal ECU fault codes.
Start by inspecting the wiring loom and connector pins; a chafed wire often mimics an ECU failure.
How do we prepare this ECU?
We sell the 03C906021A ECU in two variants. We prepare the unlocked one before dispatch; this usually takes 1–2 working days. The locked one keeps the data and immobiliser of the previous vehicle, and unlocking, programming and matching it is left to the workshop.
Not every method is possible for every unit – PIN / CAR PASS, Virgin, IMMO OFF, auto programming or cloning depend on the part number, software version and immobiliser. Before you choose the unlocked version, ask us about the options. Description of the variants: description of ECU variants.
Questions and answers
| What needs to be done after fitting this unit? |
|---|
| With the locked version: unlock it, program it and match it to the immobiliser. With the unlocked one, the scope of work depends on the preparation method, which we confirm before purchase. |
| Do 0261S04469 and 03C906021A refer to the same ECU? |
| Yes. 0261S04469 is the number assigned by Bosch, and 03C906021A is the Volkswagen part number – both describe the same unit. |
| Can I fit an ECU with a different final letter from 03C906021A? |
| We do not recommend it without consulting us. The letter denotes the hardware or software version, so a different ending may mean it is not compatible. |
| What condition is the unit in and does it have a warranty? |
| The unit is used, in working order and in good condition. You will find the warranty period in the product features table. |
Not sure which variant to choose? Email contact@auto24parts.com and give us the numbers from the label on your ECU.
