DEM-U010000 - Lost Communication With Engine control module. General Failure Information. No sub type information
System
Differential Electronic Module (DEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (12)
- Volvo S60 (2011–)2011–2015
- Volvo S80 (2007–)2007–2015
- Volvo V40 Cross Country (2013–)2013–2015
- Volvo V60 (2011–)2011–2015
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2008–2015
- Volvo XC60 (2009–)2009–2015
- Volvo XC70 (2008–)2008–2015
- Volvo XC90 (2003–)2009–2010Engine 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) continuously receives the information it needs from the engine control module (ECM) over CAN communication, including the engine torque. If communication with the engine control module is lost, the code is set. The fault may lie in the engine control module, in the communication cable, or in the connections between them.
Possible causes
- Fault in the engine control module (ECM)
- Open circuit in the communication cable
- Communication cable shorted to ground
- Communication cable shorted to voltage
- Contact resistance or oxidation in the connections
What you can do
- 1Check that the fuses are intact; their locations are in the owner's manual or on the fuse box cover
- 2Test drive the vehicle to see whether the fault returns and whether four-wheel drive works
- 3If you have a diagnostic tool, read the engine control module fault codes first and remedy them before clearing this code
- 4Check the connectors on the communication cable for oxidation and loose fit, and follow the cable for chafing and pinched areas
- 5Use a multimeter to confirm the communication cable has no contact with ground or voltage
- 6If the fault remains, have a workshop check the engine control module and the CAN communication
Symptoms you may notice1
- Four-wheel drive does not work
What the fault can affect2
- Four-wheel drive is disengaged
- Four-wheel drive has reduced function
General guidance for car owners. Diagnosis on the car can point to a different cause.