System Type Haldex AWD 2nd/3rd Generation
Condition Used – Fully Tested & Functional
Manufacturer Siemens (Original OEM)
Supplier Reference HAP511
Cross Reference 5WP22201
Warranty 12 Months
Used & Verified Working Unit Original Siemens Haldex control unit, tested before dispatch to restore reliable rear axle engagement and AWD operation in compatible Volvo vehicles.
OEM Part Numbers & Cross-References
Main OEM Part Number:
5WP22211
Compatible / Interchangeable Numbers:
5WP22211-01 • 5WP22211-02 • 5WP22201
Supplier / Vehicle References:
HAP511
Always Verify Your Part Number Before ordering, compare the part number on your current Haldex / DEM module with the references listed above. Some vehicles may require recoding after installation.
Technical Specifications
System Type:
Haldex AWD 2nd/3rd Generation
Component:
Differential Electronic Module (DEM / AWD ECU)
Cross Reference:
5WP22201
Application:
Volvo AWD vehicles with 2nd/3rd generation Haldex coupling
Part Condition:
Used – Fully Tested & Functional
Support:
Online support if diagnostics, compatibility or coding help is needed
Product Description
This is a used, tested original Siemens Haldex control unit with OEM number 5WP22211, designed for Volvo AWD systems using the 2nd/3rd generation Haldex coupling. The module functions as the electronic management unit of the rear differential system and controls torque transfer to the rear axle when traction is needed.
What This Control Unit Does
- Controls the Haldex coupling to engage rear-wheel drive when required
- Communicates with ABS / DSTC and drivetrain systems
- Monitors AWD operation and stores diagnostic trouble codes
- Manages hydraulic clutch pressure strategy in the rear coupling
- Helps restore proper AWD operation when the original ECU has failed
OEM Replacement Unit This used DEM module is intended as a direct OEM-style replacement for the original control unit. After installation, fault-code clearing and a diagnostic check are recommended, and some vehicles may need recoding.
Vehicle Compatibility
Common Volvo applications for this Haldex control unit include the models below. Always confirm the part number on your current module before purchase.
Volvo
- Volvo XC90 AWD (2003–2007)
- Volvo XC70 AWD (2003–2007)
- Volvo V70 AWD (2003–2007)
- Volvo S60 AWD (2003–2004)
- Volvo S80 AWD (2003–2004)
- Selected Volvo AWD applications with matching 5WP22211-01 / -02 module numbers
Not Sure About Compatibility? Send us your VIN number or a photo of your existing part label and we will help verify fitment before you order.
Common Diagnostic Faults & Symptoms
Problems with the Haldex control unit can cause the AWD system to stop working or operate intermittently. Common symptoms and diagnostic issues include:
-
No Communication – AWD control module not responding
- Loss of rear-wheel drive / AWD not working correctly
- DSTC / anti-skid warnings related to the rear differential control module
- Intermittent AWD engagement or communication-related faults
- AWD warning light on dashboard combined with reduced traction
Installation & Recommended Service
Installation Notes
- Disconnect the battery and safely access the rear differential Haldex module
- Remove the old control unit and inspect the connector for corrosion or moisture
- Install the replacement ECU carefully and reconnect all plugs securely
- Clear stored fault codes and check communication with a suitable diagnostic tool
- Carry out recoding or adaptation if required by the vehicle after installation
Recommended While Replacing the Unit
- Inspect the Haldex control valve if related faults are stored
- Renew Haldex oil / service fluid
- Inspect wiring and connector condition
- Check for remaining AWD, ABS or DSTC faults after fitting
Online Technical Support Included If you need help with diagnostics, compatibility or installation, reach us via the contact button below.
Why Haldex Control Units Fail
1. Moisture Ingress & Corrosion
Water ingress, condensation or connector corrosion can interrupt communication and damage the internal electronics of the DEM module.
2. Control Valve or Hydraulic Faults
Related Haldex valve faults can overload the control strategy and trigger repeated AWD warnings or control-module faults.
3. Internal Electronic Failure
Heat, vibration and age can damage internal circuits, causing communication loss, stored faults or intermittent AWD function.
4. Wiring or Power Supply Problems
Damaged wiring, weak power supply or poor connector contact can create no-communication errors and unstable module behaviour.
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, valve 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 diagnostics support.
Contact Us
Important Purchase Information
- Please verify the part number before ordering
- Worldwide shipping is available
- If your country is not listed at checkout, contact us and the order can be processed manually
- Diagnostic checks are recommended after installation
- This module should only be fitted where the original OEM number matches
