VOLVO
CPM-B1D2611 - Combustion Air Blower. General Electrical Failures. Circuit short to ground
System
Combustion Pre-heater Module (CPM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The fault code concerns the combustion air fan motor in the auxiliary heater. The positive feed to the fan has a short to ground, or the signal from the fan is too low. The heater's function is blocked. The fault may be caused by a damaged fan motor, a short in the wiring, or a fan wheel that is stuck with dirt or ice.
Possible causes
- Damaged fan motor
- Cable between the heater control module and the fan short-circuited to ground
- The fan wheel is jammed or stuck, for example due to freezing or dirt
What you can do
- 1With the ignition off, check that the fan wheel turns freely by hand without sticking. Clean away any dirt or ice.
- 2Check the connectors at the fan motor and in the heater for corrosion, looseness and oxidation.
- 3Use a multimeter to check that the cable to the fan motor has no contact with ground (the body).
- 4If you have a diagnostic tool: activate the heater fan and listen for a buzzing sound. If nothing is heard, the fault is probably still present.
- 5Replace the fan motor if it is damaged, or have a workshop do it.
Symptoms you may notice3
- Poor heating in the cabin
- The parking or auxiliary heater does not work when it is activated
- The parking heater does not work
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.