977 SPN Fault Code

Name:

Fan Drive State

Description:

This parameter is used to indicate the current state or mode of operation by the fan drive. 0000b = Fan off 0001b = Engine system–General 0010b = Excessive engine air temperature 0011b = Excessive engine oil temperature 0100b = Excessive engine coolant temperature 0101b = Excessive transmission oil temperature 0110b = Excessive hydraulic oil temperature 0111b = Default Operation 1000b = Reverse Operation 1001b = Manual control 1010b = Transmission retarder 1011b = A/C system 1100b = Timer 1101b = Engine brake 1110b = Other 1111b = Not available Fan off 0000b —Used to indicate that the fan clutch is disengaged and the fan is inactive Engine system–General 0001b —Used to indicate that the fan is active due to an engine system not otherwise defined. Excessive engine air temperature 0010b —Used to indicate that the fan is active due to high air temperature. Excessive engine oil temperature 0011b —Used to indicate that the fan is active due to high oil temperature. Excessive engine coolant

977 spn fault code name is Fan Drive State. If you don't take the time to look into 977 spn fault when it arises, it can add up quickly. One small issue like 977 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 977 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

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