VOLVO
CPM-B1D2815 - Fuel pre-heater. General Electrical Failures. Circuit short to battery or open
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 body of the fuel preheater has an electrical fault, for example a short to battery voltage or an open circuit. The heater's function is blocked, and the heating in the cabin can be poor. The fault may lie in a loose connector, in the cable or in the fuel preheater itself.
Possible causes
- Contact resistance, oxidation or loose connections
- Open circuit in the wiring
- Wiring short-circuited to battery voltage
- Damaged fuel preheater
What you can do
- 1Check that the fuse for the auxiliary heater is intact.
- 2With the ignition off, look for corrosion and loose connectors at the fuel preheater.
- 3Look for visible damage to the cable to the fuel preheater, such as chafing or breaks.
- 4Use a multimeter to check that the cable to the fuel preheater is not broken and has no battery voltage when the ignition is off.
- 5Replace the fuel preheater if its connector or cable is damaged. If you are unsure, have a workshop assess it.
- 6If the fault remains, have a workshop update the software in the auxiliary heater and investigate further.
Symptoms you may notice2
- Poor heating in the cabin
- The parking or auxiliary heater does not work when it is activated
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.