AutoCodes – Ford – P1477 2001 Ford F150

P1477 2001 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 2001 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 1,881

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 2001 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 2001 Ford F150 - Medium Cooling Fan Control Primary Circuit Failure - AutoCodes.com — P1477 2001 Ford F150 Code - Medium Cooling Fan Control Primary Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1477 2001 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 2001 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 2001 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 2001 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 2001 Ford F150 Code

1. What are the common symptoms of OBDII code P1477 in a 2001 Ford F150?

- Common symptoms include the cooling fan running continuously, overheating of the engine, and a check engine light illuminated on the dashboard.

2. What does the OBDII code P1477 on a 2001 Ford F150 indicate?

- P1477 indicates a primary circuit failure in the medium cooling fan control system of the vehicle.

3. What are the possible causes of OBDII code P1477 in a 2001 Ford F150?

- Possible causes include a faulty cooling fan relay, damaged wiring or connectors in the cooling fan circuit, or a malfunctioning cooling fan control module.

4. How can I diagnose the OBDII code P1477 in my 2001 Ford F150?

- To diagnose P1477, you can use an OBDII scanner to read the code and then inspect the cooling fan relay, wiring, and connectors for any visible damage.

5. Can I still drive my 2001 Ford F150 with the OBDII code P1477?

- It is not recommended to drive the vehicle with P1477 present, as it can lead to engine overheating and potential damage. It's best to address the issue promptly.

6. How can I repair OBDII code P1477 in my 2001 Ford F150?

- Repairing P1477 typically involves replacing the cooling fan relay, repairing any damaged wiring or connectors, or replacing the cooling fan control module as needed.

7. Are there any DIY tips for fixing OBDII code P1477 in a 2001 Ford F150?

- DIY tips include checking and cleaning the cooling fan relay connections, inspecting the wiring for any visible damage, and ensuring proper grounding of the cooling fan system.

8. How much does it cost to repair OBDII code P1477 in a 2001 Ford F150?

- The cost of repair can vary depending on the specific issue causing P1477. It may range from $50 to $300 for parts and labor, but prices can vary based on location and shop rates.

9. Will resetting the OBDII code P1477 in my 2001 Ford F150 make it go away permanently?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue causing P1477 is not addressed, the code is likely to reappear after driving the vehicle.

10. How urgent is it to address OBDII code P1477 in a 2001 Ford F150?

- It is important to address P1477 promptly to prevent potential engine overheating and damage. Ignoring the issue can lead to more severe problems and costly repairs.