VOLVO
DEM-U300362 - Battery Voltage. Algorithm Based Failures. Signal compare failure
System
Differential Electronic Module (DEM)
Volvo models this fault code applies to
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 (14)
- 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–)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) compares its own power supply with the voltage supplied to the central electronic module (CEM), which it receives over the CAN network. If the difference is too large for a longer period, the code is set. The code is only relevant if it has been active for a long time in the same drive and the driver notices that four-wheel drive does not work. Otherwise it can be ignored and cleared.
Possible causes
- Voltage supply to the central electronic module (CEM) is too high or too low
- Incorrect voltage supply to the four-wheel drive control module (DEM)
- Contact resistance and oxidation in the connectors
What you can do
- 1Check that the fuses are intact; their locations are in the owner's manual or on the fuse box cover
- 2Check the battery: a weak or old battery can cause voltage variations in the control systems
- 3Check the connectors to the control module and the central electronic module for oxidation and loose fit, and follow the wiring for chafing
- 4With a diagnostic tool, compare the DEM voltage with battery voltage live; a clear difference with the engine running suggests a voltage fault
- 5If the fault remains after these checks, have a workshop trace the voltage supply to the central electronic module
Symptoms you may notice1
- Four-wheel drive does not work
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.