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 Passat 03G906018CR 5WP45606AC
Vendors's code: 5WP45606AC
Product code: 03G906018CR
Barcode:
Code 39:
ISBN:
€203.25
Price
€203.25
€250.00
Price
€250.00
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 Passat 03G906018CR 5WP45606AC
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Shipping
from
€30.00
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shipping
(Poland)
from
€30.00
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shipping
(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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The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
How can I check whether the 03G906018CR ECU will fit your Passat?
Compare two numbers with the label: 03G906018CR (Volkswagen) and 5WP45606AC (the ECU manufacturer's number). This used diesel engine module comes from a Volkswagen Passat.
Engine Control Unit Volkswagen Passat 03G906018CR 5WP45606AC
The 03G906018CR engine control unit came to us from a diesel Volkswagen Passat. A number in the 03G 906 0xx format is Volkswagen's designation for an engine ECU, and the second number on the casing, 5WP45606AC, was assigned by the module manufacturer. The computer is responsible for fuel injection and the diesel engine's ancillaries.
Numbers to compare
- 03G906018CR – Volkswagen part number, the key one for matching
- 5WP45606AC – ECU manufacturer's number
The CR suffix in the VW number describes the software or hardware version. Check both numbers on your label – the 03G906018 series without the suffix is not enough to confirm compatibility.
Symptoms of a faulty engine module
- no start despite a working fuel supply,
- a message saying there is no connection to the module,
- reduced power with no visible mechanical cause,
- problems after moisture got into the ECU.
Start by checking the power supply, earths and connector – consider replacement only once these are fine. It is also worth reading the fault memory, as stored codes help to distinguish a module failure from a sensor or wiring loom problem.
Options: locked and unlocked
We offer the ECU in two forms. The locked form retains the immobiliser and data of the donor Passat; it is used by workshops that will unlock, program and adapt it themselves. The unlocked form needs preparation before dispatch, which usually takes 1–2 working days.
PIN / CAR PASS, Virgin, IMMO OFF, auto programming or clone cannot be used on every module – it depends on the part number, software and immobiliser. Please ask before you buy. More: engine control unit options.
Questions and answers
| My label only shows 03G906018 – is that enough? |
|---|
| No. The full suffix of the VW number and the second number from the label are needed to confirm the version. |
| Will the locked version start the engine after fitting? |
| No, it needs to be unlocked, programmed and adapted to the immobiliser. |
| What condition is this ECU in? |
| It is a used, fully working part in good condition. You will find the warranty period in the product features table. |
Email contact@auto24parts.com and attach a photo of your ECU's label.
