VOLVO
CPM-U001000 - Medium Speed CAN Communication Bus. General Failure Information. No sub type information
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 heater control module cannot communicate on the MS-CAN network, because the communication is disturbed by another control module on the network or by a fault on the network. The control module then disconnects itself from the network (bus-off) and stays disabled until its power is cut. The fault may be caused by a short or open circuit in the CAN wiring, or by an internal fault in another control module.
Possible causes
- Short circuit in the CAN wiring
- Open circuit in one of the CAN wires
- Internal fault in another control module on the same part of the CAN network
- Damaged heater control module
What you can do
- 1With the ignition off, check that the connectors and wiring to the auxiliary heater are intact, with no chafing or corrosion.
- 2If other control modules also show communication faults, the fault may be elsewhere in the network. Have a workshop decide.
- 3Have a workshop measure the CAN network with diagnostic equipment. The measurement requires parts of the network to be disconnected.
- 4Do not replace any control module until the fault tracing is complete, as the fault may lie in another control module on the network.
- 5Have a workshop replace the auxiliary heater control module if it is damaged and the fault remains.
Symptoms you may notice2
- Poor heating in the cabin
- The parking heater does not work
What the fault can affect3
- The control module disconnects itself from the network and stays disabled until its power is cut
- The heater's function is blocked
- The control module makes new communication attempts when the power is connected again
General guidance for car owners. Diagnosis on the car can point to a different cause.