AutoCodes – Ford – P1479 1999 Ford F150

P1479 1999 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 1999 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 2,134

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 1999 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 1999 Ford F150 - High Fan Control Primary Circuit - AutoCodes.com — P1479 1999 Ford F150 Code - High Fan Control Primary Circuit

What does this mean?

What are the Possible Causes of the DTC P1479 1999 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 1999 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 1999 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 1999 Ford F150 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 1999 Ford F150 Code

1. What does the OBDII code P1479 on a 1999 Ford F150 indicate?

This code signifies that there is a problem with the high fan control primary circuit, indicating a potential issue with the cooling fan operation in the engineâ€™s cooling system.

2. What are common symptoms of code P1479 in a 1999 Ford F150?

Symptoms include the engine overheating, the cooling fan not activating, and occasionally, the check engine light turning on.

3. What can cause the P1479 code to appear in a 1999 Ford F150?

Causes might include a faulty cooling fan relay, damaged wiring in the fan circuit, a malfunctioning cooling fan, or a problem with the engine control module (ECM).

4. How can I troubleshoot the P1479 code in a 1999 Ford F150?

Start by inspecting the cooling fan relay and the associated wiring for any signs of damage or corrosion. Next, check the operation of the cooling fan itself and verify the functionality of the ECM.

5. What steps are involved in repairing a P1479 code on a 1999 Ford F150?

Repair steps typically involve replacing the faulty cooling fan relay, repairing any damaged wires in the circuit, or replacing the cooling fan if it's not functioning correctly.

6. Is it safe to drive a 1999 Ford F150 with a P1479 code?

Driving with this code is not recommended as it can lead to engine overheating, which might cause significant engine damage if not addressed promptly.

7. How urgent is it to fix a P1479 code on a 1999 Ford F150?

It is fairly urgent to address this issue to prevent potential engine overheating and avoid more serious engine damage.

8. Can a faulty ECM cause a P1479 code in a 1999 Ford F150?

Yes, a malfunctioning ECM can incorrectly regulate the operation of the cooling fan, leading to the P1479 code. However, ECM issues are less common and should be considered only after ruling out other more common causes.