Diagnostic trouble code information

Condition 

Fig 1: Identifying Overheat Protection Thermostat

Courtesy of VOLVO CARS OF NORTH AMERICA.

If the overheat thermostat trips, the control unit will interpret this as a fault and diagnostic trouble code CEM-5F41 will be set.

Substitute Value 

• None.

Possible Source 

• Air in the cooling system.
• Cooling system blocked.
• Defective overheat thermostat.
• Defective water temperature sensor.
• Open circuit on fuel pump circuit.

Fault symptom[s] 

• Poor interior heating.