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Engine-Codes – Generic – P1479

P1479 Code - High Fan Control Primary Circuit Malfunction

Quick Answer

The diagnostic trouble code P1479 indicates a High Fan Control Primary Circuit Malfunction. Common causes include Faulty cooling fan relay: A malfunctioning relay can prevent the cooling fan from receiving the necessary signal to turn on, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electricity to the cooling fan, causing it to malfunction, Faulty temperature sensor: A defective temperature sensor may fail to send the correct signals to the cooling fan, resulting in improper operation. 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 indicates High Fan Control Primary Circuit Malfunction.
Common causes
Common causes include Faulty cooling fan relay: A malfunctioning relay can prevent the cooling fan from receiving the necessary signal to turn on, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electricity to the cooling fan, causing it to malfunction, Faulty temperature sensor: A defective temperature sensor may fail to send the correct signals to the cooling fan, resulting in improper operation.
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 06, 2024
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Code P1479 Description

The diagnostic trouble code P1479 indicates a High Fan Control Primary Circuit Malfunction. This code is typically associated with an issue in the primary control circuit that manages the operation of the cooling fan in the vehicle. The cooling fan plays a crucial role in regulating the temperature of the engine by dissipating heat generated during operation. If the cooling fan fails to operate correctly, it can lead to overheating of the engine, which may result in serious damage if not addressed promptly.

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

Common Causes of P1479

  1. Faulty cooling fan relay: A malfunctioning relay can prevent the cooling fan from receiving the necessary signal to turn on.
  2. Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electricity to the cooling fan, causing it to malfunction.
  3. Faulty temperature sensor: A defective temperature sensor may fail to send the correct signals to the cooling fan, resulting in improper operation.
  4. Cooling fan motor failure: If the cooling fan motor is faulty or damaged, it may not be able to operate efficiently, leading to overheating issues.

Symptoms of P1479

  1. Engine overheating: One of the most common symptoms associated with this code is the engine overheating due to the cooling fan not functioning properly.
  2. High engine temperature gauge readings: The temperature gauge on the dashboard may show higher than normal readings, indicating a problem with the cooling system.
  3. Poor air conditioning performance: If the cooling fan is not working correctly, it can also affect the performance of the vehicle's air conditioning system.
  4. Engine stalling: In some cases, the engine may stall or run rough due to overheating caused by the malfunctioning cooling fan.

How to Fix P1479

  1. Diagnose the issue: Use a diagnostic scanner to identify the specific cause of the High Fan Control Primary Circuit Malfunction.
  2. Check the cooling fan relay: Test the relay to ensure it is functioning correctly. Replace if necessary.
  3. Inspect wiring connections: Check for any damaged or corroded wiring connections and repair or replace as needed.
  4. Test the temperature sensor: Verify that the temperature sensor is sending the correct signals to the cooling fan. Replace if faulty.
  5. Replace the cooling fan motor: If the cooling fan motor is found to be defective, replace it with a new one to restore proper operation.

Cost to Fix P1479

The cost of repairing a High Fan Control Primary Circuit Malfunction can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $50 to $200, while the labor costs can be between $100 and $300. Overall, the total cost of the repair may fall within the range of $150 to $500. However, it's essential to consider that prices may differ based on factors like the location of the repair shop, the vehicle's make and model, and the type of engine. It's recommended to consult with a professional mechanic for a more accurate cost estimate.

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Code P1479 Information for Specific Makes

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.

Frequently Asked Questions about P1479 Code

1. What does the OBDII code P1479 mean?

P1479 indicates a malfunction in the high fan control primary circuit, meaning the system responsible for controlling the high-speed operation of the cooling fan is not functioning properly.

2. What are the common symptoms of code P1479?

Symptoms may include engine overheating, reduced air conditioning performance, an illuminated Check Engine Light, and the cooling fan not running at high speed when needed.

3. What causes the P1479 code to appear?

Common causes include a faulty cooling fan motor, damaged wiring or connectors in the fan circuit, a malfunctioning cooling fan relay, or a defective engine control module (ECM).

4. Can I drive my car with a P1479 code?

Driving with a P1479 code is not recommended, especially if the engine is overheating, as it can lead to severe engine damage.

5. How is the P1479 code diagnosed?

A technician will typically inspect the cooling fan circuit, check for damaged wiring, test the fan relay and motor, and use a scan tool to monitor the ECM's commands to the fan.

6. How can I fix the P1479 code?

Repairs may involve replacing the cooling fan motor, repairing damaged wiring, replacing a faulty fan relay, or, in rare cases, reprogramming or replacing the ECM.

7. What tools are needed to troubleshoot a P1479 code?

Tools might include a multimeter for electrical tests, a scan tool for reading live data and commands, and basic hand tools for inspecting and replacing components.

8. Can a failing cooling fan relay cause the P1479 code?

Yes, a failing or stuck cooling fan relay is a common cause of this code and should be tested during diagnosis.

9. How much does it cost to repair a P1479 code issue?

The cost varies depending on the root cause. Replacing a cooling fan motor or relay may cost $100-$400, whereas ECM replacement or programming could be more expensive.

10. Will resetting the Check Engine Light clear the P1479 code permanently?

Resetting the light might clear the code temporarily, but if the underlying issue is not fixed, the code and symptoms will return.

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