Diagnostic Trouble Code (DTC) Information CPM-E001

Condition

Fig 1: Identifying Combustion Preheater Module (CPM)

Courtesy of VOLVO CARS CORPORATION

The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network). The diagnostic trouble code (DTC) is stored if the combustion preheater module (CPM) registers serious interference (CAN communication blocked).

NOTE:

In the event of system communication problems, it is not possible to communicate with the combustion preheater module (CPM). Therefore it will only be possible to read off the diagnostic trouble code (DTC) if the fault is intermittent.

Substitute Value

The control module shuts itself off ("bus-off").
HINT: The control module will remain shut off until the power supply is broken (15, 30, X). When the power supply is connected the control module will make a new attempt to communicate.

Possible Source

Short-circuit between the control area network (CAN) wiring
Open-circuit in the control area network (CAN) wiring
Internal fault in the control module
Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s]

Poor heating in the passenger compartment
The parking heater does not operate.