VOLVO
DEM-P188E01 - Oil Pressure Pump Control Circuit. General Failure Information. General electrical failure
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 current in the control circuit to the oil pressure pump is outside the expected range, and the four-wheel drive control module (DEM) detects this while driving. The cause can be an electrical fault in the cable, such as a short to voltage or to ground, or an internal leak in the pump.
Possible causes
- Damaged connector between the oil pressure pump and the control module
- Voltage supply cable shorted to voltage
- Voltage supply cable shorted to ground
- Open circuit or short to ground in the cable
- 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 fuses are intact; their locations are in the owner's manual or on the fuse box cover
- 3Follow the wiring between the control module and the pump for chafing, pinched areas and loose clips, and check the connector at both ends
- 4Use a multimeter to confirm the cable has no contact with ground (body). With the ignition on, also check whether the cable has voltage when it should not
- 5If you have a diagnostic tool, read the pump current in live data with the engine running and check whether the value is steady or jumps
- 6Have a workshop check the pump and replace it if it is damaged, and calibrate the control module after the change
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.