VOLVO
CPM-B1D2412 - Glow Plug. General Electrical Failures. Circuit short to battery
System
Combustion Pre-heater Module (CPM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The CPM has logged a glow plug signal that reads too high. The cause may be the cable between the CPM and the glow plug being shorted to supply voltage, or a damaged glow plug. The heater cannot be activated until the fault code has been cleared.
Possible causes
- The cable between the CPM and the glow plug is shorted to supply voltage
- Damaged glow plug
What you can do
- 1Clear the code and start the heater again; if the code returns, the fault is still present
- 2With a diagnostic tool, activate the glow plug: no rise in temperature points to a permanent fault, a rise to an intermittent one
- 3Disconnect the connector in the heater and check that the contacts are secure and free from oxidation
- 4Use a multimeter to check that the cable to the glow plug carries no voltage when the heater is off; if it does, the cable is shorted to positive
- 5If the fault returns, have a workshop check the glow plug and the wiring
Symptoms you may notice1
- 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.