Mercedes W245 B 180 CDI OM640.940 109HP Engine Control Unit ECU A6401500534

The Mercedes W245 B 180 CDI OM640.940 109HP Engine Control Unit is a factory electronic control module designed for a diesel engine paired with an automatic transmission. As a component from the Electronic Control Modules and Units group, it is responsible for precise management of the diesel engine's operation, ensuring stable power characteristics and proper interaction with other vehicle systems.

Specifications and technical data

• SKU: A6401500534
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401500534
• Substitutable numbers: A6401500534, A 640 150 05 34, 0281014668, 0 281 014 668
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the Engine Control Unit

The presented control unit is dedicated to the Mercedes B-Class W245 generation, specifically the B 180 CDI version with the OM640.940 engine producing 109 HP. The ECU module manages key parameters of the diesel engine's operation, such as fuel injection quantity, boost pressure, and injection corrections, as well as coordinating with the automatic transmission, which translates to smooth acceleration and predictable powertrain responses.

Thanks to its factory architecture, the control unit maintains compatibility with the vehicle's original electrical system, supporting correct communication with the CAN network and other onboard electronic modules. This solution helps preserve the vehicle's configuration consistency and reduces the risk of diagnostic errors after ECU replacement.

Benefits of Using an Original ECU Module

Using an original control unit in the Mercedes W245 B 180 CDI ensures:

• preservation of factory control maps for the diesel engine,
• proper cooperation with the automatic transmission,
• compatibility with factory safety and comfort systems,
• easier diagnostics using standard service tools.

As a component from the Electronic Control Modules and Units category, this ECU is designed for stable operation under the demanding thermal and electrical conditions typical of a diesel engine compartment. A used module allows for economical repair of the engine control system while maintaining the original manufacturer's specifications.

Selection, Compatibility, and Installation

To ensure proper operation, it is advisable to base the selection of the control unit on vehicle data such as the VIN and engine designation. This allows for verification of hardware and software compatibility with the specific configuration of the Mercedes W245 B 180 CDI. For ECU modules, it is crucial to match both the diesel engine version and the installed automatic transmission, which minimizes the risk of communication problems between control units.

Installing the control unit typically requires:

• correct connection to the existing wiring harness,
• application of appropriate adaptation or coding procedures in the vehicle,
• verification of errors in the ECU memory after installation.

A professional approach to installation allows for full utilization of the module's potential and restores proper powertrain operation without unnecessary interference with the engine's mechanics.

Used ECU Control Unit – Practical Information

The offered control unit is in used condition, which represents a cost-effective solution while maintaining original manufacturing quality. Used ECU modules often prove to be an effective alternative to new parts, especially when the priority is to quickly restore vehicle functionality within a reasonable budget.

If you want to better understand the principles of selecting and installing used control modules, hardware and software compatibility issues, and common service questions, consult the guide: Used Automotive Electronics – Second-Hand ECUs and Sensors. The article discusses, among other things, selection by VIN/OEM, HW/SW compatibility, and practical application examples in modern cars.

Related Control Modules for Mercedes

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