Engine-Codes
 
OBDII Code List
 
P0481 CHEVROLET

P0481 CHEVROLET - Cooling Fan Relay 2 Control Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Faulty fan control relay
  • Faulty cooling fan 2
  • Fan control relay harness is open or shorted
  • Fan control relay circuit poor electrical connection
  • Fan cooling fan harness is open or shorted
  • Fan cooling fan circuit poor electrical connection
  • When is the code detected?

    The P0481 code is detected when the Powertrain Control Module (PCM) detects that the commanded state of the driver and the actual state of the control circuit do not match.

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine overheating
  • P0481 Chevrolet Description

    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°C (223°F) 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°C (304°F) 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.

    OBDII Code P0481 Chevrolet - Cooling Fan Relay 2 Control Circuit Malfunction - Engine-Codes.com

    Related Information

    Repair Importance Level: 3
     
    1=Low 2=Medium 3=High  
    Repair Difficulty Level: 3
     
    1=Easy 2=Moderate 3=Hard  

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