OEM Part Numbers

Technical Specifications

Product Description

This is a refurbished OEM Haldex control unit with part number 09N907554C, intended for 4th-generation Haldex AWD systems in Volkswagen T5-series vehicles. The module controls rear differential engagement, supports torque transfer to the rear axle and communicates with the vehicle’s drivetrain, ABS and ESP systems.

What This Control Unit Does

• Controls hydraulic activation of the Haldex coupling for rear-wheel engagement
• Helps restore proper AWD / 4x4 operation in T5, Multivan and California applications
• Communicates with ABS / ESP and related drivetrain systems
• Stores and reports diagnostic trouble codes when faults occur
• Supports traction and stability in low-grip road conditions

A faulty Haldex ECU can cause AWD disengagement, communication errors or ESP / ABS warning lights on the dashboard. This refurbished unit is fully tested and upgraded with new silicone and a new cover for dependable long-term use.

Vehicle Compatibility

This Haldex controller is intended for Volkswagen T5-series AWD vehicles using the matching Gen 4 rear differential control unit. Always confirm the exact number on your original module before ordering.

Volkswagen

Common Symptoms of a Faulty Module

Problems with the Haldex control unit can trigger fault codes, communication problems and loss of AWD function. Typical symptoms include:

Installation

Installation Notes

• Disconnect the battery and safely access the Haldex module on the rear differential
• Remove the old controller and inspect connector pins and housing for corrosion or moisture
• Install the replacement ECU carefully and reconnect all plugs securely
• Clear fault codes and confirm AWD module communication with a suitable diagnostic tool
• Carry out coding or adaptation if required by the vehicle after installation

Recommended Service Items

• Replace the Haldex control valve N373 when replacing the control unit
• Check wiring, connectors and surrounding module area
• Inspect the Haldex pump and related AWD components
• Verify AWD operation after installation and road test

Why Haldex Control Units Fail

1. Water Ingress & Sealing Failure

Moisture ingress and poor sealing can affect the control unit housing and electronics, leading to corrosion, unstable communication and AWD malfunction.

2. Valve or Pump Related Faults

Failure of the Haldex control valve N373 or related pump components can trigger repeated faults, poor clutch engagement and loss of rear axle drive.

3. Internal Electronic Failure

Internal controller faults, worn electronic components or memory problems can cause intermittent operation or complete loss of rear differential control.

4. Wiring or Connector Problems

Damaged connectors, poor terminal contact or unstable power supply can interrupt module operation and create misleading communication or actuator fault codes.

Warranty

12-Month Warranty: This refurbished 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, valve, pump 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