VOLVO
DEM-P188971 - Oil Pressure Pump Performance. Mechanical Failures. Actuator stuck
System
Differential Electronic Module (DEM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The four-wheel drive control module (DEM) compares the current through the oil pressure pump with preset limits while driving. The code is set when the deviation persists, which indicates that the pump has stuck or is running sluggishly, for example because of an internal leak in the pump.
Possible causes
- Internal leak in the oil pressure pump
- Damaged oil pressure pump
What you can do
- 1Read off the fault code, note it and clear it. Test drive the vehicle to see if the fault returns
- 2Check that the connector to the control module and the wiring to the pump are firmly seated and undamaged
- 3Listen for unusual noises from the pump or the rear axle during the test drive
- 4If you have a diagnostic tool, activate the oil pressure pump and listen for it to start and run smoothly without jerks
- 5If the fault returns, have a workshop calibrate the control module after the check and replace the oil pressure pump if it is damaged
Symptoms you may notice2
- Four-wheel drive does not work
- Warning symbol and text message in the display
What the fault can affect1
- Four-wheel drive is disengaged for as long as the fault is present
General guidance for car owners. Diagnosis on the car can point to a different cause.