AutoCodes – Ford – P0405 2009 Ford Fusion

P0405 2009 Ford Fusion Code - Exhaust Gas Recirculation Sensor 'A' Circuit Low

Quick Answer

The EGR monitor checks the differential pressure feedback EGR sensor signal to the Powertrain Control Module (PCM) for low voltage. Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0405 2009 Ford Fusion indicates Exhaust Gas Recirculation Sensor 'A' Circuit Low.
Common causes: Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,647

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0405 2009 Ford Fusion Description

The EGR monitor checks the differential pressure feedback EGR sensor signal to the Powertrain Control Module (PCM) for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.

OBDII Code P0405 2009 Ford Fusion - Exhaust Gas Recirculation Sensor 'A' Circuit Low - AutoCodes.com — P0405 2009 Ford Fusion Code - Exhaust Gas Recirculation Sensor 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0405 2009 Ford Fusion?

Faulty EGR volume control solenoid valve
Carbon built up on EGR valve
EGR volume control solenoid valve harness is open or shorted
EGR volume control solenoid valve circuit poor electrical connection
Faulty EGR temperature sensor and circuit

How to Fix the DTC P0405 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 P0405 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 P0405 2009 Ford Fusion code?

Need more information on how to fix the P0405 2009 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0405 2009 Ford Fusion code diagnosed by a professional: Find a repair shop in your area

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 P0405 2009 Ford Fusion Code

What does the OBDII code P0405 indicate on a 2009 Ford Fusion?

Code P0405 suggests that the Exhaust Gas Recirculation (EGR) Sensor 'A' Circuit is experiencing low voltage, indicating a potential issue with the EGR sensor or its circuitry.

What are common symptoms of the P0405 code in a 2009 Ford Fusion?

Symptoms might include rough idling, reduced fuel efficiency, engine stalling, a noticeable decrease in engine performance, and the Check Engine Light turning on.

What can cause the P0405 code to appear on a 2009 Ford Fusion?

Potential causes include a faulty EGR valve, damaged EGR valve sensor, poor electrical connections in the EGR sensor circuit, or a short in the wiring harness connected to the EGR sensor.

How can I troubleshoot the P0405 code in my 2009 Ford Fusion?

Start by inspecting the EGR valve and its sensor for any visible signs of damage or corrosion. Check the wiring and connectors for breaks or shorts. If these components appear intact, consider testing the EGR sensor with a multimeter to ensure it is functioning properly.

What are the repair steps for fixing the P0405 code in a 2009 Ford Fusion?

Repairing the P0405 code typically involves cleaning or replacing the EGR valve, replacing the damaged EGR sensor, repairing any faulty wiring, and ensuring all electrical connections are secure.

Is it safe to drive a 2009 Ford Fusion with the P0405 code?

While you can usually still drive the vehicle, it's not recommended to do so for an extended period. Driving with this issue can lead to a decrease in engine performance, increased emissions, and possibly further damage to the EGR system.

How much does it typically cost to resolve a P0405 code in a 2009 Ford Fusion?

The cost can vary widely depending on the specific repair needed. For instance, replacing an EGR valve can cost anywhere from $150 to $400 including parts and labor, while repairs involving wiring or connectors might be less, depending on the extent of the damage.

Can I fix the P0405 code on my 2009 Ford Fusion myself?

If you have some mechanical skill, you might be able to address the P0405 code yourself, especially if it involves replacing a sensor or cleaning the EGR valve. However, if the problem lies within the circuitry or if troubleshooting does not reveal a clear cause, professional diagnosis and repair might be necessary.

After repairing the P0405 code in a 2009 Ford Fusion, what should I do next?

Once repairs are completed, clear the code from your vehicle's computer with an OBDII scanner and take the car for a test drive to ensure that the Check Engine Light does not reappear and the vehicle is running smoothly.