OEM Part Numbers

Technical Specifications

Product Description

This is a genuine used Volkswagen OEM Haldex control unit with part number 0AY907554L. It is a key component of the fifth-generation Haldex all-wheel-drive system, responsible for managing rear axle engagement, traction support and communication with the drivetrain electronics.

What This Control Module Does

• Controls rear differential clutch engagement in the Gen 5 AWD system
• Supports correct torque transfer to the rear axle when traction is needed
• Communicates with traction control and related drivetrain electronics
• Helps restore AWD / 4Motion operation when the original module has failed
• Provides a replacement solution for no-communication and traction-related faults

Vehicle Compatibility

The 0AY907554L is used in selected Volkswagen vehicles equipped with Gen 5 Haldex AWD. Always verify the exact part number on your original module before ordering.

Volkswagen

Common Symptoms of a Faulty Module

A defective Gen 5 Haldex control unit commonly causes the following issues:

Installation

Installation Steps

• Verify the exact OEM part number on the original control unit
• Disconnect the battery and safely access the AWD module
• Remove the old controller and inspect connector pins and wiring
• Install the replacement module in the original position
• Clear stored fault codes with suitable diagnostic equipment
• Carry out coding, adaptation or professional diagnostic checks if required
• Perform a test drive and confirm correct AWD / 4Motion operation

Why Haldex Control Units Fail

1. Internal Electronic Failure

Wear of internal electronic components can cause intermittent operation, memory faults or complete loss of communication with the AWD system.

2. Moisture and Contamination

Moisture ingress, dirt or oil contamination can affect module reliability and trigger unstable AWD behavior.

3. Wiring or Connector Problems

Damaged pins, poor terminal contact or unstable power supply can interrupt module operation and create misleading communication faults.

4. Related AWD System Faults

Other faults in the AWD system can overload the control strategy and contribute to repeated warnings or incorrect rear axle engagement.

Quality Assurance & Warranty

12-Month Warranty: This used Haldex control unit has been tested for correct operation and is supplied with a 12-month warranty under normal operating conditions.

Warranty Coverage Includes:

• Internal control unit malfunction
• Communication failures caused by the module itself
• Faults related to internal memory or controller operation

Warranty Exclusions:

• Incorrect installation or incompatible vehicle fitment
• External wiring or drivetrain faults
• Physical damage, water damage after installation or mishandling

Questions or Need Help?

Our technical team is ready to assist with compatibility checks, installation guidance and coding support.

Important Purchase Information

• Please verify this part fits your specific vehicle before placing an order
• Worldwide shipping is available
• If your country is not listed at checkout, contact us and the order can be processed manually
• Professional diagnostic checks are recommended after installation
• Coding or adaptation may be required depending on the vehicle