OEM Part Numbers & Cross-References

Technical Specifications

Product Description

This is a refurbished OEM Haldex control unit with part number 7H0907554E, intended for second-generation Haldex AWD systems in Volkswagen T5 platform vehicles. The module controls rear differential engagement, supports traction transfer to the rear axle and communicates with the vehicle’s drivetrain and stability systems.

What This Control Unit Does

• Controls hydraulic activation of the Haldex coupling for rear-wheel engagement
• Helps restore proper AWD / 4x4 operation in Volkswagen T5 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

Vehicle Compatibility

This Haldex controller is intended for Volkswagen T5-based AWD vehicles using the matching Gen 2 rear differential control unit. Always verify the exact number on your original module before purchase.

Volkswagen

Common Diagnostic Fault Codes & Symptoms

Problems with the Haldex control unit can trigger communication faults, valve faults or warning lights on the dashboard. Common fault codes and symptoms include:

Installation & Recommended Service

Installation Notes

• Disconnect the battery and safely access the Haldex module on the rear differential
• Remove the old controller and inspect the 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 While Replacing the Unit

• Replace the Haldex control valve N373 when replacing the control unit
• Check the wiring, connectors and surrounding module area
• Inspect the Haldex system for stored drivetrain or stability-control faults
• Verify AWD operation after installation and road test

Why Haldex Control Units Fail

1. Moisture Ingress & Corrosion

Water or condensation inside the module housing can damage the electronics and interrupt communication with the AWD system.

2. N373 Valve or Hydraulic Faults

A failing clutch control valve or hydraulic issue can overload the control unit and trigger repeated AWD-related faults.

3. Internal Electronic Failure

Age, vibration and temperature cycling can lead to internal circuit failure, communication loss and unstable rear axle engagement.

4. Wiring or Connector Problems

Corroded plugs, damaged wiring or weak power supply can create no-communication errors and unreliable AWD function.

Quality Assurance & Warranty

12-Month Warranty: This refurbished Haldex control unit has been fully 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 or drivetrain faults
• Physical damage, water damage after installation or mishandling

Questions or Need Help?

If you have any questions about compatibility, diagnostics or installation, contact us and we will help you choose the correct Haldex solution for your Volkswagen AWD vehicle.

Important Purchase Information

• Please verify this part fits your specific vehicle before placing an order
• Worldwide shipping is available – if your country is not shown at checkout, contact directly for manual processing
• Replacing the Haldex valve N373 is recommended when fitting a replacement ECU
• Online support is included if the module requires coding after installation