Diagnostic Trouble Code (DTC) Information CPM-U1A3787

Condition

The combustion preheater module (CPM) receives a message that a collision has occurred and switches off the heater.

The diagnostic trouble code (DTC) is stored if the control module detects that:

A collision signal is received.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

Heater started.

NOTE:

The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Fig 1: Identifying Booster Heater

Courtesy of VOLVO CARS CORPORATION

Substitute Value

Heater's function blocked.

Possible Source

Crash event received
NOTE:
The heater cannot be activated until the diagnostic trouble code (DTC) has been erased.

Fault symptom[s]

Parking heater/Does not work
Temperature control/Heater not hot enough in rear section
Temperature control/Heater not hot enough in front section
Temperature control/Heater does not work
Temperature control/Heater slow to heat in rear section
Temperature control/Heater slow to heat in front section