P0694 Fan 2 Control Circuit High

Definition: The OBD-II code P0694 indicates that the Engine Control Module (ECM) has detected a high voltage condition in the fan 2 control circuit. This typically means there is an issue with the electrical circuit responsible for controlling the second cooling fan, which may affect engine cooling performance.

p0694 – Fan 2 Control Circuit High

Typical Severity: Moderate

Common Causes

P0694 – Fan 2 Control Circuit High

Common causes:

• Faulty cooling fan motor
• Short circuit in the wiring harness
• Faulty cooling fan relay
• Defective engine coolant temperature sensor
• Issues with the powertrain control module (PCM)

 

Common Misdiagnosis

OBD2 Code: P0694

Description: Fan 2 Control Circuit High

Common Misdiagnosis: Replacing the cooling fan or relay without checking for wiring issues or a faulty control module.

 

Common Diagnostic Steps

OBD2 Code: P0694

Description: Fan 2 Control Circuit High

• Check the fan relay and its connections for any signs of damage or corrosion.
• Inspect the wiring harness for any open, shorted, or damaged wires leading to the fan control circuit.
• Test the cooling fan motor for proper operation and resistance levels using a multimeter.
• Examine the Engine Control Module (ECM) for any faults or issues related to the fan control circuit.
• Verify that all fuses related to the cooling system are intact and functioning correctly.
• If equipped, check any associated sensors (such as temperature sensors) that may affect fan operation.
• Clear the code and perform a test drive to see if it returns after repairs are made.