The Volvo Parts, Accessories &
Performance Specialists Since 1963

Haldex 4 AOC (Active On-Demand Coupling) Differential Pump

BorgWarner DS119863 - 140813

Item Number
Mfr Part Number
Brand Classification
Units Per Car
Country of Origin
Product Group
Repair & maintenance
OE References
Genuine Volvo - 31256757, 31259349

Product Description

If your AWD P3 Volvo has unexpectedly left you stranded in slippery conditions, it's possible your car's AWD needs service.

AWD Volvos from 2003 and up (like the S60R/V70R, XC70, XC90, and AWD versions of the S60/V70 and S40/V50) use a system called Haldex to engage the rear wheels when the front wheels start to slip.

A cutaway diagram of the Active On-Demand Coupling

This Haldex system relies on a multi-plate clutch in the rear of the car, also called the Active On-Demand Coupling (AOC). When the system detects front wheel spin, valves open and allow pressurized oil to clamp the clutch down, hooking up the rear wheels and getting you moving again.

The system relies on oil pressure as high as 80 bar (1100psi!) to cycle the hydraulic clutch, and just like any system that pumps oil around, regular filter and fluid changes are recommended. For Haldex, we suggest changing the fluid and filter every 50,000 miles

A clogged (and failed!) Haldex pump

If fluid changes are neglected and the filter gets clogged, the Haldex pump has to work harder and harder until it eventually burns out: you'll suddenly get lots of front wheel spin, and when scanned the car will have pump error codes from the DEM, such as DEM-0006.

This pump kit is made by the Original Equipment Manufacturer for Volvo for this part, BorgWarner. It includes a new pump and new allen bolts, and is perfect for getting all four of your P3's wheels spinning again.


About BorgWarner

As of 2022, BorgWarner Inc. is an American automotive parts manufacturer headquartered in Auburn Hills, Michigan. The company maintains production facilities and technical systems at 93 sites in 22 countries worldwide and has around 49,000 employees.

Over the past decade, BorgWarner has bought up or consolidated many other parts brands.

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