AutoCodes – Ford – P0405 2008 Ford Fusion

P0405 2008 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 2008 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.

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Code Popularity 2,529

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
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Code P0405 2008 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 2008 Ford Fusion - Exhaust Gas Recirculation Sensor 'A' Circuit Low - AutoCodes.com — P0405 2008 Ford Fusion Code - Exhaust Gas Recirculation Sensor 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0405 2008 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 2008 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 2008 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 2008 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 P0405 2008 Ford Fusion Code

1. What are common symptoms of OBDII code P0405 in a 2008 Ford Fusion?

The common symptoms of OBDII code P0405 in a 2008 Ford Fusion include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0405 in a 2008 Ford Fusion indicate?

OBDII code P0405 in a 2008 Ford Fusion indicates a malfunction in the Exhaust Gas Recirculation (EGR) sensor 'A' circuit, specifically a low voltage condition.

3. What are possible causes of OBDII code P0405 in a 2008 Ford Fusion?

Possible causes of OBDII code P0405 in a 2008 Ford Fusion include a faulty EGR sensor, damaged wiring or connectors in the EGR sensor circuit, or a problem with the EGR valve itself.

4. How can I diagnose the cause of OBDII code P0405 in my 2008 Ford Fusion?

To diagnose the cause of OBDII code P0405 in your 2008 Ford Fusion, you can use a scan tool to check for the specific code, inspect the EGR sensor and its connections for damage, and test the EGR valve to ensure proper functioning.

5. Can I continue driving my 2008 Ford Fusion with OBDII code P0405?

While it may be possible to continue driving your 2008 Ford Fusion with OBDII code P0405, it is recommended to address the issue promptly to prevent potential damage to the engine and to maintain optimal vehicle performance.

6. How should I repair OBDII code P0405 in my 2008 Ford Fusion?

To repair OBDII code P0405 in your 2008 Ford Fusion, you may need to replace the EGR sensor, repair any damaged wiring or connectors in the circuit, or address any underlying issues with the EGR valve.

7. Is it possible to reset OBDII code P0405 in a 2008 Ford Fusion without making repairs?

While it is possible to reset OBDII code P0405 in a 2008 Ford Fusion using a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Will OBDII code P0405 cause my 2008 Ford Fusion to fail an emissions test?

Yes, OBDII code P0405 in a 2008 Ford Fusion can cause the vehicle to fail an emissions test due to the malfunction in the Exhaust Gas Recirculation (EGR) system.

9. How much does it typically cost to repair OBDII code P0405 in a 2008 Ford Fusion?

The cost to repair OBDII code P0405 in a 2008 Ford Fusion can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Are there any preventive maintenance tips to avoid OBDII code P0405 in a 2008 Ford Fusion?

To prevent OBDII code P0405 in a 2008 Ford Fusion, it is recommended to follow the manufacturer's maintenance schedule, regularly inspect the EGR system components for any signs of wear or damage, and address any issues promptly.