VOLVO
CPM-8704 - Control module. Internal fault
System
Combustion Pre-heater Module (CPM)
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 CPM has found an internal fault in itself. The heater cannot be activated until the fault code has been cleared. The fault may come from temporary interference or from a module that needs replacing.
Possible causes
- Internal fault in the combustion preheater module (CPM)
What you can do
- 1Clear the code and start the heater to see whether it comes back
- 2Check that the module is firmly mounted and that its connectors are free from oxidation
- 3If the fault returns, have a workshop replace the CPM
Symptoms you may notice2
- Poor heating in the passenger compartment
- The parking heater does not work
What the fault can affect1
- The heater cannot be activated until the fault code has been cleared
General guidance for car owners. Diagnosis on the car can point to a different cause.