OBD-II Trouble Code Description for P0484 GMC

Fan Circuit Over Current

What does this mean?

OBD2 Code P0484 GM definition:
The electric cooling fan is controlled by the powertrain control module (PCM) through the cooling fan relay based on inputs from the following components: – The engine coolant temperature (ECT) sensor – The intake air temperature (IAT) sensor – The A/C selector switch – The A/C refrigerant pressure sensor – The vehicle speed sensor (VSS) The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The cooling fan relay will be commanded ON when the following conditions are met: – The engine coolant temperature reaches 106¡ãC (223¡ãF) or more. – The A/C clutch requested. – The vehicle speed is less than 38 MPH. The cooling fan relay will be commanded ON regardless of vehicle speed when the following conditions are met: – The engine coolant temperature is 151¡ãC (304¡ãF) or more. – The A/C refrigerant pressure is high. The cooling fan may be commanded ON when the engine is not running under a fan run-on conditions described in the electric cooling fan general description portion of the service manual.

Symptoms

Possible sumptoms of OBD code P0484 GM
– Engine Light ON (or Service Engine Soon Warning Light) – Engine overheating

Causes

Possible causes of OBD code P0484 GM
– Fan control relay harness – Fan control relay connector – Fan control relay – Cooling Fan The Error code is generally activated on detection of the following conditions: The P0485 GM code is detected when the PCM detects that the commanded state of the driver and the actual state of the control circuit do not match.

Possible Solutions

– Replace the malfunctioning fan control relay – Replaced cooling fan