Fault code P1479 – a step-by-step guide to diagnosing and fixing it

Error code P1479 is displayed and the check engine light is on - what does this mean?

The DTC P1479 is a manufacturer-specific fault code that is recognized by the OBD system and typically indicates problems with the fan control or the cooling system. In Ford vehicles, this code usually refers to a fault in the fan control circuit, while it can have different meanings for other manufacturers.

What causes can this error code have?

• Defective radiator fan motor
• Damaged fan control relay
• Broken or corroded cable connections
• Defective fan control module
• Faulty temperature sensors
• Short circuit in the fan circuit
• Faulty fuses in the fan circuit
• Problems with the motor control unit (ECM/PCM)

What symptoms occur in parallel with fault code P1479?

• Engine overheating: The engine becomes unusually hot, especially in city traffic
• Fan not running: The radiator fan does not switch on even though the engine is hot
• Fan runs continuously: The fan runs constantly, even when the engine is cold
• Increased engine temperature: The temperature display shows higher values than normal
• Loss of power: The engine loses power on longer journeys
• Check engine light: The check engine light is permanently illuminated

How to fix the problem of error code P1479?

• The repair requires a systematic diagnosis of the fan control and the cooling system.
• Check and replace the fan motor and relay: Test motor for function, replace defective components with new original parts, check wiring for damage
• Inspect and repair cable connections: Check all plug connections in the fan circuit for corrosion, repair or replace damaged cables, clean contacts
• Diagnose the fan control module: Test control module with diagnostic device, replace completely if defective, have programming carried out by specialist workshop
• Check fuses and relays: Check all relevant fuses and replace if necessary, test relays for proper function
• Check temperature sensors: Test coolant temperature sensor for correct values, replace defective sensors, carry out calibration
• Complete system diagnostics: Use EOBD diagnostic device for complete fault analysis, check all control units for additional codes, repair by qualified workshop