VOLVO
CEM-U019800 - Lost Communication With Telematic Control Module. General Failure Information. No sub type information
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:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The fault code means that the control module storing the fault has lost, or has disturbed, its link to the telematic control module. The telematics functions in the car may then stop working. The fault concerns communication in the network and not one individual control module.
Possible causes
- Missing power supply to the telematic control module
- Broken ground wire to the module
- Poor contact in the connections
- Open or shorted CAN wiring
- A module not intended for the car, such as a used unit with other software or hardware
What you can do
- 1Check the power supply and ground point to the telematic module, and the connector for contact resistance and oxidation
- 2Check the module ground wire for breaks or a short to voltage
- 3Check that the connectors in the wiring are secure and not corroded
- 4If the fault returns, have a workshop check the CAN wiring. Replace the CEM only if testing shows it is damaged
Symptoms you may notice1
- Telematics does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.