VOLVO
DEM-0003 - System voltage. Faulty voltage
System
Differential Electronic Module (DEM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (14)
- Volvo S40 (2004–2013)2005–2010Transmission AW50/51 AWD, M66 AWD only
- Volvo S60 (2001–2009)2003–2005All transmissions except: AW55-50/51SN
- Volvo S60 (2001–2009)2006–2008All transmissions except: AW55-50/51SN, TF-80SC
- Volvo S60 (2001–2009)2009Transmission AW50/51 AWD, M58 only
- Volvo S80 (1999–2006)2003–2006Transmission AW50/51 AWD only
- Volvo V50 (2004–2013)2005–2010Transmission AW50/51 AWD, M66 AWD only
- Volvo V70 (2000–2008)2003–2005All transmissions except: AW55-50/51SN
- Volvo V70 (2000–2008)2006–2007All transmissions except: AW55-50/51SN, TF-80SC
- Volvo V70 XC / XC70 (2001–2007)2003–2007
- Volvo XC90 (2003–)2003–2004, 2006All transmissions except: AW55-50/51SN
- Volvo XC90 (2003–)2005All transmissions except: AW55-50/51SN, TF-80SC AWD
- Volvo XC90 (2003–)2007All transmissions except: AW55-50/51SN, TF-80SC
- Volvo XC90 (2003–)2008All transmissions except: TF-80SC
- Volvo XC90 (2003–)2009Transmission AW50/51 AWD only
What does this fault code mean?
The four-wheel drive control module (DEM) compares its own supply voltage with the voltage in the central electronic control module (CEM). The code is stored when the two differ too much, which can be caused by a signal wire shorted to voltage or to ground, or by a break in the supply. The four-wheel drive is blocked or disengaged for as long as the fault is active.
Possible causes
- Signal wire shorted to voltage
- Signal wire shorted to ground
- Break in the supply voltage
What you can do
- 1Read and erase the code, then road test to see whether it returns
- 2Check that the fuses are intact
- 3If you have a diagnostic tool, read the four-wheel drive control module voltage at idle and compare it with the battery voltage; any difference points to the supply
- 4Check the wire to the connected unit for damage, and the connectors for oxidation and contact resistance
- 5If the fault is not active now but has been, it is probably intermittent; check the connectors carefully and watch whether it comes back
- 6If the code returns, have a workshop with diagnostic equipment check the supply voltage and replace the control module if needed
Symptoms you may notice1
- The four-wheel drive does not work
What the fault can affect2
- The four-wheel drive is blocked
- The four-wheel drive is disengaged
General guidance for car owners. Diagnosis on the car can point to a different cause.