P0691 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0691 – Cooling Fan 1 Control Circuit Low

 

P0691 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light),Radiator fan inoperative,Possible engine overheating

 

P0691 Possible Causes

 

Faulty Fan 1 Relay,Fan 1 Relay harness is open or shorted,Fan 1 Relay circuit poor electrical connection,Faulty Fan 1,Fan 1 harness is open or shorted,Fan 1 circuit poor electrical connection,Faulty Engine Control Module (ECM)

 

P0691 Description

 

The Engine Control Module (ECM) monitors the Cooling Fan 1 Control Circuit. The ECM sets the OBDII code when the Cooling Fan 1 Control Circuit is not to the factory specifications.