VOLVO
CPM-B1D2711 - Heater Coolant Pump. 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 positive feed to the coolant pump for the auxiliary heater has a short to ground, or the signal from the pump is too low. The heater's function is blocked. The fault may be in the cable or in the pump itself.
Possible causes
- Damaged cable or connection to the coolant pump
- Damaged coolant pump
- Cable between the heater control module and the coolant pump short-circuited to ground
- Contact resistance, oxidation or loose connections
What you can do
- 1With the ignition off, check the connectors and the cable to the coolant pump for corrosion, looseness and visible damage.
- 2Use a multimeter to check that the cable to the coolant pump has no contact with ground (the body).
- 3If you have a diagnostic tool: activate the water pump and listen for a buzzing sound. If nothing is heard, the fault is still present.
- 4Replace the coolant pump if it is damaged, or have a workshop do it.
- 5If the fault remains after checking the wiring, have a workshop check the heater control module.
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.