AutoCodes – Ford – P1477 2009 Ford Fusion

P1477 2009 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 2009 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 1,696

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 2009 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 2009 Ford Fusion - Medium Cooling Fan Control Primary Circuit Failure - AutoCodes.com — P1477 2009 Ford Fusion Code - Medium Cooling Fan Control Primary Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1477 2009 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 2009 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 2009 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 2009 Ford Fusion code?

Need more information on how to fix the P1477 2009 Ford Fusion code? Get Access to Factory Service Manuals

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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 2009 Ford Fusion Code

1. What are the common symptoms of OBDII code P1477 on a 2009 Ford Fusion?

- Common symptoms include the cooling fan not working properly, engine overheating, and possible illumination of the check engine light.

2. What can cause the OBDII code P1477 to trigger in a 2009 Ford Fusion?

- The code P1477 is typically triggered by a failure in the primary circuit of the cooling fan control system, such as a faulty cooling fan relay or wiring issues.

3. How can I diagnose the cause of OBDII code P1477 on my 2009 Ford Fusion?

- To diagnose the issue, you can start by checking the cooling fan relay, inspecting the wiring for any damage, and testing the cooling fan motor for proper function.

4. Is it safe to continue driving my 2009 Ford Fusion with OBDII code P1477?

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

5. How can I repair OBDII code P1477 on my 2009 Ford Fusion?

- Repairing code P1477 may involve replacing the cooling fan relay, repairing any damaged wiring, or replacing the cooling fan motor if necessary.

6. Can a DIY enthusiast fix OBDII code P1477 on a 2009 Ford Fusion?

- Depending on your experience and tools, you may be able to address code P1477 yourself by following repair guides and utilizing diagnostic tools. However, professional help is recommended for complex issues.

7. Will resetting the OBDII code P1477 on my 2009 Ford Fusion resolve the issue?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing code P1477. It's essential to diagnose and repair the issue to prevent further complications.

8. How much does it typically cost to repair OBDII code P1477 on a 2009 Ford Fusion?

- The cost of repairing code P1477 can vary depending on the cause of the issue, parts needed, and labor costs. It's recommended to get estimates from reputable mechanics or repair shops.

9. Can a faulty thermostat cause OBDII code P1477 on a 2009 Ford Fusion?

- While a faulty thermostat can contribute to engine overheating issues, it is not a common cause of code P1477. Focus on diagnosing the cooling fan control system for this specific code.

10. Is code P1477 specific to the 2009 Ford Fusion, or can it occur in other vehicle models?

- OBDII code P1477 can occur in various vehicle models, not just the 2009 Ford Fusion. It indicates a primary circuit failure in the cooling fan control system, which can be present in different vehicles.