Diagnostic trouble code information

Condition 

Fig 1: Identifying Water Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.

If the water pump circuit is short-circuited to voltage supply, the control unit will interpret this as a fault and the diagnostic trouble code CEM-5F3A will be set.

Substitute Value 

• None.

Possible Source 

• Signal wire short-circuited to voltage supply.
• Defective water pump.

Fault symptom[s] 

• Parking heater does not work.
• Poor interior heating.