VOLVO
CPM-U002808 - Vehicle Communication Bus A. General Failure Information. Bus Signal / Message Failures
System
Combustion Pre-heater Module (CPM)
Volvo models this fault code applies to
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 auxiliary heater loses contact with the remote start system, because no communication arrives on the cable between them. The heater's function is blocked. The fault may be caused by a damaged connector, oxidation in the connections or a damaged control module.
Possible causes
- Damaged connector and oxidation in the connections
- Damaged control module
What you can do
- 1With the ignition off, check that the connectors to the remote receiver and the heater are firmly seated, with no oxidation or damage.
- 2Check that the wires in the cable harness are correctly routed and undamaged. Replace the harness if it has breaks or damage, or have a workshop do it.
- 3If the connector on the remote receiver is damaged, replace the receiver, or have a workshop do it.
- 4If the connector on the heater is damaged, have a workshop decide whether the heater needs replacing.
- 5Have a workshop check the heater control module and update its software if the fault remains.
Symptoms you may notice4
- The parking heater does not work
- The heat does not get hot enough in the rear section
- The heat does not get hot enough in the front section
- The heater does not work with the temperature control
What the fault can affect1
- The heater's function is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.