VOLVO
DEM-P188914 - Oil Pressure Pump Performance. General Electrical Failures. Circuit short to ground or open
System
Differential Electronic Module (DEM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (12)
- Volvo S60 (2011–)2011–2012
- Volvo S80 (2007–)2007–2012
- Volvo V60 (2011–)2011–2012
- Volvo V70 (2008–)2008–2012
- Volvo XC60 (2009–)2009–2012
- Volvo XC70 (2008–)2008–2012
- Volvo XC90 (2003–)2005Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2006Engine B8444S only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2007–2010Engine B6324S, B8444S only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2011Engine B6324S5, B8444S only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2012Engine B6324S5 only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2013–2014Engine B6324S5, D5244T18 only · Transmission TF-80SC AWD only
What does this fault code mean?
The four-wheel drive control module (DEM) monitors the signal from the oil pressure pump, which supplies pressure to the four-wheel drive clutch. When the signal falls outside the permitted range, the module treats it as an electrical fault. The usual cause is a cable shorted to ground or an interruption in the supply to the pump.
Possible causes
- The signal wire from the pump is shorted to ground
- Interruption in the voltage supply to the pump
- The voltage supply cable is shorted to ground
- Loose, corroded or damaged connector between the pump and the control module
- 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 fuses are intact; their locations are in the owner's manual or on the fuse box cover
- 3Check the connectors at the pump and the control module: they should be firmly seated and free from corrosion
- 4Follow the wiring between the control module and the pump for chafing and pinched areas, and use a multimeter to confirm it has no contact with ground (body)
- 5If you have a diagnostic tool, activate the pump motor and listen for it to start and run smoothly. If it starts and then stops, the fault may have been intermittent
- 6If the fault returns, have a workshop check the pump and replace it 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
General guidance for car owners. Diagnosis on the car can point to a different cause.