VOLVO
CEM-DD00 - Communication with LSM control module and CPM control modoule. Communication fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The central module is losing contact with the light switch module and/or the parking heater module, because communication on the network is being disturbed. The fault may come from a signal wire short-circuited to voltage or ground, or from a damaged communication device in one of the control modules. It shows up at the light switch, the beam height control and the parking heater.
Possible causes
- The signal wire is short-circuited to voltage
- The signal wire is short-circuited to ground
- Internal fault in another control module on the same part of the network
What you can do
- 1Test the light switch and the parking heater and note which ones do not work
- 2With a multimeter, check that the signal wire between the control modules is not short-circuited to voltage or ground
- 3Check that the connectors in the wiring are secure and free from corrosion
- 4If the wire is intact, have a workshop replace the module for the light switch or the parking heater, one at a time, and check the function between each replacement
Symptoms you may notice3
- The light switch does not work
- The beam height control does not work
- The parking heater does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.