Name: 31312859 Haldex Control Unit Volvo Used
Brand: Borgwarner
Price: 229.90 EUR
Availability: InStock

System Type Haldex AWD Gen 5 (5th Generation)

Condition Used – Tested OEM

Manufacturer Haldex (Original OEM – Austria)

Warranty 12 Months

✓ Used – Tested & Verified Working Unit Removed from a running vehicle and tested for CAN-bus communication, AOC pump control and solenoid operation prior to dispatch. Ready for direct installation – no reprogramming required.

OEM Part Numbers

Main Part Number (Volvo OEM):

31312859 • 31 312 859

Superseded by / Exchange Numbers:

31367749 • 31431022 • 36001654

Haldex / Supplier Reference Numbers:

116619 • AZJLA • 12W322 • BBFIZ33107

⚠️ Used Part Notice This is a tested used OEM unit removed from a vehicle. It is sold as-is after functional testing. Always verify the part number on your existing module before ordering. If you are unsure about compatibility, contact us – we are happy to assist.

Technical Specifications

Haldex Generation:

5th Generation (Gen 5)

Module Type:

AOC / DEM – Differential Electronic Module

System:

Active On-Demand Coupling (AWD)

Communication Bus:

CAN-bus (High Speed)

Manufacturer:

Haldex – Made in Austria

Application:

Volvo AWD (2012–2018)

Part Condition:

Used – Tested OEM

Warranty Period:

12 Months

Programming Required:

Plug & Play – no recoding needed

Product Description

This is a used OEM Haldex 5th Generation control unit with part number 31312859 (Haldex supplier reference 116619, configuration code AZJLA), designed for the Volvo Active On-Demand Coupling (AOC) AWD system. Also known as the DEM – Differential Electronic Module – this unit is the electronic brain of the Volvo Gen 5 AWD system. The updated exchange/replacement part number is 31367749 / 31431022.

What This Control Unit Does

Continuously monitors wheel speed, throttle position, lateral acceleration and yaw rate
Controls the hydraulic pump and solenoid valve governing rear clutch engagement pressure
Pre-pressurises the clutch pack before slip occurs (Gen 5 pre-fill feature) for near-instantaneous torque transfer
Communicates with ABS, DSTC, engine management and body control modules via CAN-bus
Manages torque distribution between front and rear axles dynamically in real time
Protects the coupling system from thermal overload

ℹ️ Plug & Play – No Programming Required The original software calibration is retained in this used unit. No dealer reprogramming is required after installation. Clear fault codes after fitting and perform a test drive to verify AWD operation.

Vehicle Compatibility

Part number 31312859 fits Volvo AWD models equipped with the 5th generation Haldex Active On-Demand Coupling system produced between 2012 and 2018. The updated replacement part numbers are 31367749 and 31431022. Always verify the part number on your existing module label before ordering.

Volvo

Model	Production Date
XC60 I (156)	01.2012 – 12.2017
XC70 III (BZ)	01.2013 – 12.2016
S60 III (224)	01.2013 – 12.2018
S60 Cross Country (224)	01.2016 – 12.2018
S80 II (124)	01.2013 – 12.2015
V60 I (155)	01.2013 – 12.2018
V70 III (BW)	01.2013 – 12.2016

✓ Not Sure About Compatibility? If you are unsure whether this unit fits your vehicle, send us your VIN number or the part number from your existing module. We will confirm compatibility before you order.

Common Diagnostic Fault Codes

A faulty Haldex Gen 5 DEM module commonly triggers one or more of the following fault codes. These can be read with Volvo VIDA/DiCE, VCDS or a compatible OBD-II scanner:

U0136-00 – Lost Communication with Rear Differential Control Module (DEM) – most common fault
U0136 – No communication with DEM – module fails to respond on CAN-bus
AWD-0001 – AWD system fault – system running in FWD fallback mode
AWD-0004 – Oil pressure pump performance fault – AOC pump not building pressure
AWD-0007 – Oil temperature sensor fault inside DEM module
AWD-0009 – Haldex clutch actuator slipping – mechanical or hydraulic failure
DSTC Warning – Illuminated DSTC warning light linked to DEM failure
"4WD Fault" – "Four wheel drive fault – Service required" on instrument cluster

ℹ️ Diagnostic Tip A faulty DEM module typically fails to communicate with scan tools, making diagnosis difficult. If your scanner shows no communication with the rear differential module (U0136) or the AWD system is completely inactive, the DEM is the primary suspect. Always check fuses, CAN-bus wiring and ground points before replacing the module.

Installation & Calibration

Installation Steps

Locate the Haldex DEM module – mounted on the rear differential / Haldex coupling unit under the vehicle (rear axle area)
Disconnect the vehicle battery before removal
Disconnect the electrical connector from the DEM module
Remove the mounting bolts and carefully extract the module
Install the replacement unit and torque bolts to specification
Reconnect the electrical connector and battery
Clear all stored fault codes using a compatible diagnostic scanner
Perform a road test to confirm AWD system engagement

✓ Online Technical Support Included If you need assistance after installation, our technical team is available to help. Reach us via the contact button below or at [email protected]

Recommended Maintenance at Time of Installation

Service the Haldex coupling – replace AOC fluid (use OEM-approved Haldex Gen 5 oil only)
Inspect the wiring connector and harness for corrosion or damage
Check AWD system fuses dedicated to the Haldex/DEM circuit
Clear all stored diagnostic fault codes after installation and perform a test drive
Confirm AWD engagement by driving on a low-grip surface or using diagnostic tool live data

Why Haldex Gen 5 DEM Modules Fail

1. Internal Electronic Failure

The most common failure mode is internal PCB damage – corroded solder joints, failed capacitors or damaged MOSFET drivers caused by heat cycling and moisture ingress. This causes complete loss of CAN communication (U0136).

2. Oil Temperature Sensor Failure

The oil temperature sensor inside the DEM module is a well-documented weak point in Volvo Gen 5 applications. A failed sensor triggers incorrect AWD engagement logic and may cause the system to lock out AWD as a protective measure.

3. AOC Pump Motor Failure

If the hydraulic pump motor controlled by the DEM draws excessive current or fails, the module may shut down to protect itself, resulting in complete AWD deactivation.

4. Moisture / Corrosion

Water ingress into the module connector or housing causes corrosion of internal PCB traces and connector pins – common in vehicles operated in wet or heavily salted road conditions.

⚠️ Recommended Maintenance Intervals

Replace Haldex AOC fluid every 30,000 – 50,000 km or every 2 years
Inspect rear wiring harness and connector block annually
Inspect AOC pump filter at each fluid service
Scan AWD module if any dashboard warning lights appear

Quality Assurance & Warranty

12-Month Warranty: This used Haldex Gen 5 control unit has been tested and is covered by a 12-month warranty against functional defects under normal operating conditions.

Warranty Coverage Includes:

Electronic control unit malfunctions
CAN-bus communication failures with AWD, ABS or DSTC modules
AOC pump solenoid control circuit defects
Oil temperature sensor internal to the DEM

Warranty Exclusions: Damage resulting from incorrect installation, incompatible vehicle fitment, external electrical faults, use of non-OEM AOC fluid, or physical damage during handling.

ℹ️ Recommendation: Service the Haldex AOC When Fitting This Unit Fresh AOC fluid and a clean filter protect the used control unit and ensure correct AWD operation after installation.

Shipping

Worldwide shipping available. Unit is carefully packaged to prevent damage in transit. Tracking number provided upon dispatch. Contact us for shipping costs to your country.

Questions or Need Help?

Our technical team is ready to assist with compatibility checks, installation guidance and diagnostic support for the Haldex Gen 5 AWD system.

Contact Us

Important Purchase Information

Please verify this part fits your specific vehicle before placing an order
Photos are for illustrative purposes only – the actual unit may differ in appearance
Worldwide shipping available (if your country is not listed at checkout, contact us for personal processing)
It is strongly recommended to service the Haldex AOC (fluid change) when replacing the DEM module
Online support is available if needed after installation

31312859 Haldex Control Unit Volvo Used