VOLVO
CEM-DD0C - LIN-bus 3. Communication fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
Communication on LIN bus 3 is disturbed, so the central module cannot talk to the siren or the remote receiver. The fault may come from a wire with a short circuit or a break, or from a faulty unit on the bus. The siren and the alarm function are affected.
Possible causes
- Open circuit in one of the LIN wires
- Short circuit between the LIN wires
- Faulty operation of another control module on the same LIN network
What you can do
- 1Test the alarm with the remote control and listen for the siren
- 2Follow the wire to the siren with a multimeter for breaks and for short circuits to ground or positive
- 3Check that the connectors at the siren and the remote receiver are secure
- 4Have a workshop find which unit does not respond, and replace it
Symptoms you may notice2
- The siren sounds erratically or not at all
- The alarm cannot be set or unset
General guidance for car owners. Diagnosis on the car can point to a different cause.