AutoCodes – Ford – P1477 2007 Ford Fusion

P1477 2007 Ford Fusion 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 2007 Ford Fusion 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 1,828

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 2007 Ford Fusion 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 2007 Ford Fusion - Medium Cooling Fan Control Primary Circuit Failure - AutoCodes.com — P1477 2007 Ford Fusion Code - Medium Cooling Fan Control Primary Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1477 2007 Ford Fusion?

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 2007 Ford Fusion?

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 2007 Ford Fusion 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 2007 Ford Fusion 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 2007 Ford Fusion Code

1. What does the OBDII code P1477 mean for a 2007 Ford Fusion?

P1477 indicates a Medium Cooling Fan Control Primary Circuit Failure, meaning the vehicle's PCM has detected an issue with the electrical circuit controlling the medium-speed cooling fan.

2. What are the common symptoms of code P1477 in a 2007 Ford Fusion?

Symptoms may include the cooling fan not operating as expected, the engine overheating, the air conditioning performing poorly, or an illuminated check engine light.

3. What causes the P1477 code to appear?

Common causes include a faulty cooling fan motor, damaged wiring or connectors in the cooling fan circuit, a failed cooling fan relay, or a malfunctioning powertrain control module (PCM).

4. Can I drive my 2007 Ford Fusion with the P1477 code?

Driving with this code is not recommended, especially if overheating occurs, as it can cause severe engine damage.

5. How do I diagnose the P1477 code in my Ford Fusion?

Start by visually inspecting the cooling fan wiring and connectors for damage or corrosion. Test the cooling fan relay, fan motor, and associated circuits for proper operation.

6. How do I fix the P1477 code on my 2007 Ford Fusion?

Repairs may include replacing the cooling fan motor, repairing or replacing damaged wiring, replacing the cooling fan relay, or reprogramming or replacing the PCM if necessary.

7. What tools are needed to troubleshoot the P1477 code?

Youâ€™ll need an OBDII scanner, a multimeter to test electrical circuits, and potentially a wiring diagram for the cooling fan system.

8. How much does it cost to repair a P1477 code in a 2007 Ford Fusion?

Repair costs vary depending on the issue. Replacing a cooling fan motor can cost $200â€“$600, while a relay or wiring repair may cost less. PCM replacement is more expensive, typically around $500â€“$1,000.

9. Can a dirty or clogged radiator cause the P1477 code?

No, a clogged radiator is not a direct cause of the P1477 code. However, it can lead to overheating, which might indirectly cause the cooling fan system to work harder and potentially trigger issues.

10. Will resetting the check engine light fix the P1477 code?

No, simply clearing the code will not fix the underlying issue. You must address the root cause of the cooling fan circuit failure to prevent the code from returning.