AutoCodes – Ford – P0406 2009 Ford Fusion

P0406 2009 Ford Fusion Code - Exhaust Gas Recirculation Sensor 'A' Circuit High

Quick Answer

The EGR monitor checks the EGR sensor signal to the Powertrain Control Module (PCM) for high 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: P0406 2009 Ford Fusion indicates Exhaust Gas Recirculation Sensor 'A' Circuit High.
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 2,653

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 Apr 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0406 2009 Ford Fusion Description

The EGR monitor checks the EGR sensor signal to the Powertrain Control Module (PCM) for high voltage. The test fails when the average voltage to the PCM exceeds the maximum calibrated value.

OBDII Code P0406 2009 Ford Fusion - Exhaust Gas Recirculation Sensor 'A' Circuit High - AutoCodes.com — P0406 2009 Ford Fusion Code - Exhaust Gas Recirculation Sensor 'A' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0406 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 P0406 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 P0406 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 P0406 2009 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 P0406 2009 Ford Fusion Code

1. What are the common symptoms of OBDII code P0406 on a 2009 Ford Fusion?

The common symptoms of code P0406 include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0406 "Exhaust Gas Recirculation Sensor 'A' Circuit High" mean for a 2009 Ford Fusion?

Code P0406 indicates that the Exhaust Gas Recirculation (EGR) system's sensor 'A' circuit is detecting a high voltage signal, which may lead to improper EGR valve operation.

3. What are the possible causes of OBDII code P0406 on a 2009 Ford Fusion?

Possible causes of code P0406 include a faulty EGR sensor, a damaged EGR valve, wiring issues in the EGR circuit, or a problem with the PCM (Powertrain Control Module).

4. How can I diagnose the OBDII code P0406 on my 2009 Ford Fusion?

Diagnosing code P0406 involves visually inspecting the EGR system components, checking the wiring and connectors for any damage, testing the EGR sensor and valve functionality, and using a scan tool to gather data.

5. Can I still drive my 2009 Ford Fusion with OBDII code P0406 present?

It is not recommended to drive your vehicle with code P0406 present, as the EGR system's improper operation can lead to further engine damage and decreased performance.

6. How can I repair OBDII code P0406 on my 2009 Ford Fusion?

To repair code P0406, you may need to replace the EGR sensor or valve if found faulty, repair any damaged wiring or connectors, and clear the code from the PCM using a scan tool.

7. Are there any DIY tips for fixing OBDII code P0406 on a 2009 Ford Fusion?

While some basic inspections and cleaning of EGR components can be done DIY, diagnosing and repairing code P0406 often requires specialized tools and knowledge, so it's best to consult a professional mechanic.

8. How much does it cost to fix OBDII code P0406 on a 2009 Ford Fusion?

The cost of fixing code P0406 can vary depending on the specific issue causing the code, but it may range from $100 to $500 or more, including parts and labor.

9. Can a dirty EGR system cause OBDII code P0406 on a 2009 Ford Fusion?

Yes, a dirty EGR system can lead to code P0406 as it may affect the proper functioning of the EGR sensor or valve, causing voltage irregularities in the circuit.

10. Is it important to address OBDII code P0406 promptly on a 2009 Ford Fusion?

Yes, addressing code P0406 promptly is crucial to prevent further engine damage, ensure optimal vehicle performance, and maintain fuel efficiency in your 2009 Ford Fusion.