Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CPM-U300016

Condition
The combustion preheater module (CPM) checks its own system voltage.
The diagnostic trouble code is stored if the control module detects:
- Power supply too low
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.





Substitute value
- Heater's function blocked.

Possible source
- Contact resistance and oxidation in the terminals.
- Poorly charged battery or corroded connecting cables.
- Damaged battery.
- Damaged charging system.

Fault symptom[s]
- Poor heating in compartment
- Parking heater does not operate