Volkswagen Passat CC 3.6 FSI BWS 300HP Engine Unit ECU Kit 03H906032DQ Automatic

The Volkswagen Passat CC 3.6FSI BWS 300HP Engine Control Unit 03H906032DQ Automatic is an original electronic control module designed to work with the 3.6 FSI BWS engine and an automatic transmission. This specialized ECU ensures precise management of the engine's operation and associated systems, resulting in stable power characteristics and proper cooperation with the automatic gearbox. Due to its factory design, it is a solution tailored to the electrical architecture of the Passat CC, enabling professional powertrain repairs.

Specifications and technical data

• SKU: 03H906032DQ
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 03H906032DQ
• Substitutable numbers: 03H906032DQ, 03H 906 032 DQ, 03H906032AB, 03H 906 032 AB, 0261S02625, 0 261 S02 625, 3C8937049E, 3C8 937 049 E
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Intended Use and Function of the Control Unit

The engine control unit in the Passat CC 3.6 FSI is responsible for comprehensive control of the combustion process, fuel delivery, ignition timing, and cooperation with the automatic transmission. A correctly selected ECU module is crucial for:

• maintaining stable engine operating parameters across the full load range,
• proper communication with the automatic transmission and onboard systems,
• preserving the factory performance of the 3.6 FSI BWS engine,
• correct operation of OBD diagnostic systems.

Thanks to its design compliant with manufacturer requirements, this control unit allows for the retention of the original powertrain operating characteristics without the need for electrical system modifications.

Compatibility and Replacement Numbers

The presented module belongs to the group of Electronic Control Modules and Units, meaning it is an integrated component of the vehicle's communication network. It has an assigned OEM part number and a set of interchangeable numbers that facilitate the selection of the correct control unit for a specific Passat CC configuration.

The presence of reference numbers allows for:

• verification of compatibility with a specific BWS engine version,
• adaptation to the appropriate software and hardware version,
• safe replacement within the same family of control units.

Before purchasing, it is advisable to compare the markings with the currently installed module or use VIN-based selection to ensure full compatibility with the vehicle's electrical system.

Integration with Automatic Transmission

The control unit is designed to work with an automatic transmission, which is important for both driving comfort and powertrain durability. Proper communication between the ECU and the gearbox affects:

• smooth gear changes under various loads,
• correct torque management during downshifts and acceleration,
• coordination of engine and gearbox operation in the vehicle's available driving modes.

This makes the control unit the right choice for repairs where maintaining the factory cooperation between the 3.6 FSI engine and the automatic transmission is required, without compromising on refinement and throttle response.

Condition, Origin, and Service Application

The module comes from the Volkswagen brand offering and is a used part, making it an attractive cost-effective alternative to new control units while maintaining original construction. This type of ECU is particularly useful in situations where:

• the existing control unit has suffered electronic or software damage,
• replacement is necessary as part of diagnosing engine-related errors,
• a solution compatible with the factory installation without wiring modifications is sought.

Before installation, it is recommended to perform diagnostics and, if necessary, adaptation or programming according to the service procedures for the specific Passat CC unit.

Technical Support and Selection of the Right ECU

To minimize the risk of incompatibility, it is advisable to use selection based on the OEM number, replacement numbers, and vehicle data. A detailed discussion of the principles for selecting used control modules, hardware and software compatibility issues, and practical examples can be found in the guide: Used Automotive Electronics – Second-Hand ECUs and Sensors.

If you are planning a comprehensive repair or upgrade of the engine area in your Volkswagen and need other parts from the same group, such as engine control units, comfort modules, or other ECUs, check the available parts in the category Volkswagen Electronic Control Modules and Units.