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P1479 Ford Code - High Fan Control Primary Circuit

Quick Answer

The P1479 Ford code indicates a problem with the high fan control primary circuit in the vehicle's cooling system. Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from turning on or operating at the correct speed, Defective cooling fan motor: A faulty cooling fan motor may fail to operate, leading to inadequate cooling of the engine, Wiring issues: Damaged or corroded wiring in the high fan control primary circuit can disrupt the flow of electricity and prevent the fan from functioning properly. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1479 Ford indicates High Fan Control Primary Circuit.
Common causes
Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from turning on or operating at the correct speed, Defective cooling fan motor: A faulty cooling fan motor may fail to operate, leading to inadequate cooling of the engine, Wiring issues: Damaged or corroded wiring in the high fan control primary circuit can disrupt the flow of electricity and prevent the fan from functioning properly.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1479 Ford Description

The P1479 Ford code indicates a problem with the high fan control primary circuit in the vehicle's cooling system. The primary fan control circuit is responsible for regulating the operation of the cooling fan, which helps to dissipate heat from the engine. When this circuit malfunctions, it can lead to issues with engine temperature regulation and overall performance.

OBDII Code P1479 Ford - High Fan Control Primary Circuit
P1479 Ford Code - High Fan Control Primary Circuit

Common Causes of P1479 Ford

  1. Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from turning on or operating at the correct speed.
  2. Defective cooling fan motor: A faulty cooling fan motor may fail to operate, leading to inadequate cooling of the engine.
  3. Wiring issues: Damaged or corroded wiring in the high fan control primary circuit can disrupt the flow of electricity and prevent the fan from functioning properly.
  4. Blown fuse: A blown fuse in the cooling fan circuit can interrupt the power supply to the fan, causing it to malfunction.
  5. Faulty engine coolant temperature sensor: A defective engine coolant temperature sensor can provide incorrect temperature readings to the cooling fan control module, resulting in improper fan operation.

Symptoms of P1479 Ford

  1. Engine overheating: One of the most common symptoms associated with this code is engine overheating. The cooling fan may fail to turn on or operate at the correct speed, leading to inadequate cooling of the engine.
  2. High engine temperature gauge readings: If the cooling fan is not functioning properly, the engine temperature gauge may show higher than normal readings, indicating a problem with the cooling system.
  3. Reduced air conditioning performance: The air conditioning system may not work as efficiently if the cooling fan is not operating correctly, as the fan helps to cool the condenser.
  4. Burning smell: In some cases, a burning smell may be present due to the overheating of components in the cooling system.
  5. Check engine light: The vehicle's onboard diagnostics system may trigger the check engine light to alert the driver to a problem with the high fan control primary circuit.

How to Fix P1479 Ford

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to identify the root cause of the problem.
  2. Inspect the cooling fan relay: Check the cooling fan relay for signs of damage or corrosion. Replace the relay if necessary.
  3. Test the cooling fan motor: Test the cooling fan motor to ensure it is functioning properly. Replace the motor if it is defective.
  4. Check the wiring: Inspect the wiring in the high fan control primary circuit for any damage or breaks. Repair or replace any faulty wiring.
  5. Reset the trouble code: Clear the trouble code from the vehicle's onboard computer after completing the repairs to reset the system and ensure proper operation.

Cost to Fix P1479 Ford

The cost of repairing a high fan control primary circuit issue can vary depending on the specific cause of the problem and the necessary repairs. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Therefore, the total cost of repairing this issue may fall between $150 and $500. However, it is important to note that these estimates are approximate and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic or auto repair shop to obtain a more accurate cost estimate for addressing this code.

When is the Code Detected?

The Powertrain Control Module (PCM) enables high cooling fan and detects an open or shorted circuit

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Information for Specific Ford Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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