VOLVO
CEM-DF11 - CAN-H, high speed network. Signal missing
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
10 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (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 (10)
- Volvo C30 (2007–2013)2007–2013
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2013
- Volvo S40 (2004–2013)2004–2012
- Volvo S60 (2001–2009)2005–2009
- Volvo S80 (1999–2006)2005–2006
- Volvo V50 (2004–2013)2004–2012
- Volvo V70 (2000–2008)2005–2008
- Volvo V70 XC / XC70 (2001–2007)2005–2007
- Volvo XC90 (2003–)2005–2015
What does this fault code mean?
The CEM detects a break in the CAN H wire of the high speed network. The engine may then not start, and the malfunction indicator can light with a message in the display. The fault most often lies in a broken wire or a poor connection in the network.
Possible causes
- Open circuit in the CAN H wire in the high speed network
- Contact resistance in the connectors in the network
- Open circuit in another CAN wire in the high speed network
What you can do
- 1If the engine does not start, check the battery first, since a weak charge can cause many odd faults
- 2Check the connectors in the high speed CAN for loose connections, corrosion and moisture
- 3Check the harness for chafing and damage where it moves or passes through a grommet
- 4With a diagnostic tool, read the fault codes from all control modules. Communication faults in several modules point to a shared fault in the network
- 5Use a multimeter to check that the CAN H wire is continuous along its whole length and not broken
- 6After the repair, clear the fault code and check that the engine starts and the message does not return
Symptoms you may notice3
- The engine does not start
- The malfunction indicator lamp is lit
- A message appears in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.