VOLVO
CEM-DD0A - 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?
The central module has detected that LIN communication with the siren or the remote receiver is blocked. The fault may lie in the wiring, in a damaged communication device or in another control module on the same network. As a result the siren works erratically or not at all, and the alarm cannot be operated.
Possible causes
- Internal fault in another control module on the same part of the LIN network
- Open circuit in one of the LIN wires
- Short circuit between the LIN wires
What you can do
- 1Try locking and unlocking the car with the remote control, and listen for the siren
- 2With a multimeter, check that the wire to the siren has no break and no contact with the car body or the battery positive
- 3Make the same check on the wire to the remote receiver
- 4Have a workshop read which control module does not respond, and replace it
Symptoms you may notice2
- The siren sounds erratically or not at all
- The alarm cannot be armed or disarmed
General guidance for car owners. Diagnosis on the car can point to a different cause.