VOLVO
CPM-4501 - Combustion fan. Activated too long
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 logged that the heater ran past its permitted ventilation time. The heater is then deactivated and the code is set. The cause may be a damaged combustion fan or a damaged flame sensor.
Possible causes
- Damaged combustion fan
- Damaged flame sensor
What you can do
- 1Check that the air intake and exhaust outlet on the heater are not blocked, for example by leaves, snow or dirt
- 2Make sure the flame sensor has no soot build-up and is not damaged
- 3Clear the code and start the heater again to see whether the fault returns
- 4If you have a diagnostic tool, read the flame sensor temperature in live data; if it does not behave as it should, the flame sensor is suspect
- 5If the fault remains, have a workshop check the combustion fan and measure the flame sensor resistance
Symptoms you may notice1
- The parking heater does not work
What the fault can affect1
- The heater is deactivated when the code is set
General guidance for car owners. Diagnosis on the car can point to a different cause.