AutoCodes – Ford – P1477 2000 Ford F150

P1477 2000 Ford F150 Code - Medium Cooling Fan Control Primary Circuit Failure

Quick Answer

Monitors the medium fan control (MFC) primary circuit output from the Powertrain Control Module (PCM). Common causes include Faulty Cooling Fan Relay, Cooling Fan Relay harness is open or shorted, Cooling Fan Relay 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: P1477 2000 Ford F150 indicates Medium Cooling Fan Control Primary Circuit Failure.
Common causes: Common causes include Faulty Cooling Fan Relay, Cooling Fan Relay harness is open or shorted, Cooling Fan Relay 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 1,967

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 P1477 2000 Ford F150 Description

Monitors the medium fan control (MFC) primary circuit output from the Powertrain Control Module (PCM). The test fails if: With the MFC output commanded on (grounded), excessive current draw is detected on the MFC circuit; or with the MFC circuit commanded off, voltage is not detected on the MFC circuit (the PCM expects to detect IGN START/RUN voltage coming through the medium speed FC relay coil to the MFC circuit).

OBDII Code P1477 2000 Ford F150 - Medium Cooling Fan Control Primary Circuit Failure - AutoCodes.com — P1477 2000 Ford F150 Code - Medium Cooling Fan Control Primary Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1477 2000 Ford F150?

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

How to Fix the DTC P1477 2000 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 P1477 2000 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 P1477 2000 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 P1477 2000 Ford F150 Code

1. What are common symptoms of OBDII code P1477 on a 2000 Ford F150?

- Common symptoms include the cooling fan running continuously, overheating issues, and potential illumination of the check engine light.

2. What can cause the OBDII code P1477 on a 2000 Ford F150?

- The code P1477 is typically caused by a malfunction in the cooling fan control primary circuit, which may be due to a faulty cooling fan relay, wiring issues, or a defective cooling fan motor.

3. How do I diagnose the cause of OBDII code P1477 on my 2000 Ford F150?

- To diagnose the issue, you can start by checking the cooling fan relay, inspecting the wiring for damage or loose connections, and testing the cooling fan motor for proper operation.

4. Can I drive my 2000 Ford F150 with OBDII code P1477?

- It is not recommended to drive your vehicle with code P1477 as it can lead to engine overheating and potential damage. It's best to address the issue promptly to avoid further problems.

5. How can I repair OBDII code P1477 on my 2000 Ford F150?

- Repairing code P1477 may involve replacing the cooling fan relay, repairing any damaged wiring, or replacing the cooling fan motor if necessary. It's important to address the root cause of the issue to clear the code.

6. Will resetting the OBDII code P1477 on my 2000 Ford F150 fix the issue?

- Simply resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing code P1477. Proper diagnosis and repair are needed to address the issue effectively.

7. Are there any specific tools required to diagnose OBDII code P1477 on a 2000 Ford F150?

- Basic tools like a multimeter, wiring diagram, and possibly a scan tool to read live data may be helpful in diagnosing the cause of code P1477 on your 2000 Ford F150.

8. Can a DIY enthusiast fix OBDII code P1477 on a 2000 Ford F150?

- Depending on your mechanical skills and access to tools, a DIY enthusiast may be able to diagnose and repair code P1477 by following proper diagnostic procedures and replacing faulty components.

9. How long does it typically take to repair OBDII code P1477 on a 2000 Ford F150?

- The repair time for code P1477 can vary depending on the cause of the issue and your experience level. It may take anywhere from a few hours to a day to diagnose and fix the problem.

10. Will fixing OBDII code P1477 improve the performance of my 2000 Ford F150?

- Yes, addressing code P1477 and ensuring proper cooling fan operation can help prevent engine overheating, maintain optimal engine temperature, and improve overall performance and reliability of your vehicle.