AutoCodes – Ford – P1479 2002 Ford F150

P1479 2002 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 2002 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 2,347

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 2002 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 2002 Ford F150 - High Fan Control Primary Circuit - AutoCodes.com — P1479 2002 Ford F150 Code - High Fan Control Primary Circuit

What does this mean?

What are the Possible Causes of the DTC P1479 2002 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 2002 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 2002 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 2002 Ford F150 code?

Need more information on how to fix the P1479 2002 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 2002 Ford F150 Code

What does the OBDII code P1479 mean for a 2002 Ford F150?

P1479 indicates a problem with the high fan control primary circuit, which controls the operation of the engine cooling fan.

What are the common symptoms of the P1479 code?

Common symptoms include the engine overheating, the cooling fan running continuously, or the fan not operating at all.

What could cause the P1479 code to trigger?

Potential causes include a faulty cooling fan motor, a defective fan relay, wiring issues, or a malfunctioning engine control module (ECM).

How can I diagnose the P1479 code?

To diagnose P1479, check the fan motor and relay, inspect wiring for damage or corrosion, and test the voltage at the fan connector while the engine is running.

Is it safe to drive my Ford F150 with the P1479 code?

It is not recommended to drive the vehicle if the engine is overheating, as this can lead to severe engine damage.

What are some common repairs for the P1479 code?

Common repairs may include replacing the cooling fan motor, repairing or replacing damaged wiring, or replacing a faulty fan relay.

How can I reset the P1479 code after repairs?

You can reset the code by using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes, but ensure the underlying issue is fixed first.

Will the P1479 code cause the check engine light to come on?

Yes, the P1479 code typically causes the check engine light to illuminate on the dashboard.

Can I fix the P1479 code myself?

If you have basic automotive knowledge, you may be able to diagnose and fix the issue, but if you're unsure, it's best to consult a professional mechanic.

What should I do if the P1479 code keeps returning after repairs?

If the code persists, further diagnostics may be needed to check for underlying issues, such as ECM faults or additional wiring problems.