AutoCodes – Ford – P1479 2003 Ford F150

P1479 2003 Ford F150 Code - High Fan Control Primary Circuit

Quick Answer

Monitors the High Fan Control (HFC) primary circuit output from the Powertrain Control Module (PCM). Common causes include Faulty Cooling Fan, Cooling Fan harness is open or shorted, Cooling Fan circuit poor electrical connection. 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 2003 Ford F150 indicates High Fan Control Primary Circuit.
Common causes: Common causes include Faulty Cooling Fan, Cooling Fan harness is open or shorted, Cooling Fan circuit poor electrical connection.
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.

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Code Popularity 2,224

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1479 2003 Ford F150 Description

Monitors the High Fan Control (HFC) primary circuit output from the Powertrain Control Module (PCM). The test fails if the HFC output commanded on (grounded), excessive current draw is detected on the HFC circuit or, with the HFC circuit commanded off, voltage is not detected on the HFC circuit (the PCM expects to detect VPWR voltage through the high speed FC relay coil to the HFC circuit).

OBDII Code P1479 2003 Ford F150 - High Fan Control Primary Circuit - AutoCodes.com — P1479 2003 Ford F150 Code - High Fan Control Primary Circuit

What does this mean?

What are the Possible Causes of the DTC P1479 2003 Ford F150?

Faulty Cooling Fan
Cooling Fan harness is open or shorted
Cooling Fan circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1479 2003 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1479 2003 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1479 2003 Ford F150 code?

Need more information on how to fix the P1479 2003 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P1479 on a 2003 Ford F150?

- Common symptoms include the cooling fan running at high speed constantly, engine overheating, and potential issues with the vehicle's air conditioning system.

2. What could cause the OBDII code P1479 on a 2003 Ford F150?

- The code P1479 typically indicates a problem with the high fan control primary circuit, which can be caused by a faulty cooling fan relay, damaged wiring, or a malfunctioning cooling fan motor.

3. How can I diagnose the OBDII code P1479 on my 2003 Ford F150?

- To diagnose the issue, you can start by checking the cooling fan relay, inspecting the wiring harness for any damage or corrosion, and testing the cooling fan motor for proper functionality.

4. Can I continue driving my 2003 Ford F150 with the OBDII code P1479?

- It is not recommended to continue driving with the code P1479 present, as it can lead to engine overheating and potential damage if the cooling fan is not functioning properly.

5. How can I repair the OBDII code P1479 on my 2003 Ford F150?

- Repairing the code P1479 may involve replacing the cooling fan relay, repairing any damaged wiring, or replacing the cooling fan motor if necessary.

6. Are there any DIY tips for fixing the OBDII code P1479 on a 2003 Ford F150?

- DIY enthusiasts can start by checking the cooling fan relay for proper operation, inspecting the wiring connections for any issues, and testing the cooling fan motor with a multimeter to determine if it needs replacement.

7. Will resetting the OBDII code P1479 on my 2003 Ford F150 make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing the code is not fixed, it is likely to reappear after some time.

8. Is it necessary to visit a mechanic for the OBDII code P1479 on a 2003 Ford F150?

- While some DIY repairs are possible, it is recommended to seek professional help, especially if you are not familiar with automotive electrical systems, to ensure the issue is diagnosed and repaired correctly.

9. Can a faulty thermostat cause the OBDII code P1479 on a 2003 Ford F150?

- While a faulty thermostat can contribute to engine overheating, it is not a direct cause of the code P1479 related to the high fan control primary circuit.

10. How much can I expect to pay for repairing the OBDII code P1479 on a 2003 Ford F150 at a dealership or auto repair shop?

- The cost of repairing the code P1479 can vary depending on the exact cause of the issue and labor rates in your area, but it may range from $100 to $300 or more.