AutoCodes – Generic – P0404

P0404 Code - Exhaust Gas Recirculation Circuit Range/Performance

Quick Answer

Early Exhaust Gas Recirculation (EGR) systems components include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Common causes include EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection. 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: P0404 indicates Exhaust Gas Recirculation Circuit Range/Performance.
Common causes: Common causes include EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection.
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 74,724

How popular is this code, among other codes? Medium

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 Mar 24, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0404 Description

Early Exhaust Gas Recirculation (EGR) systems components include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

OBDII Code P0404 - Exhaust Gas Recirculation Circuit Range/Performance - AutoCodes.com — P0404 Code - Exhaust Gas Recirculation Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0404?

EGR volume control solenoid valve
EGR volume control solenoid valve harness is open or shorted
EGR volume control solenoid valve circuit poor electrical connection
EGR temperature sensor and circuit

How to Fix the DTC P0404?

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 does this mean?

Code Tech Notes

User submitted video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0404 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 P0404 code?

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Information for Specific Makes

P0404 Acura — Exhaust Gas Recirculation Valve Circuit Range/Performance
P0404 Audi — Exhaust Gas Recirculation Control Circuit Range/Performance
P0404 Buick — Exhaust Gas Recirculation Open Position Performance
P0404 Cadillac — Exhaust Gas Recirculation Open Position Performance
P0404 Chevrolet — Exhaust Gas Recirculation Open Position Performance
P0404 Chrysler — Exhaust Gas Recirculation Position Sensor Performance
P0404 Dodge — Exhaust Gas Recirculation Position Sensor Performance
P0404 Ford — Exhaust Gas Recirculation Circuit Range/Performance
P0404 GMC — Exhaust Gas Recirculation Open Position Performance
P0404 Honda — Exhaust Gas Recirculation Valve Circuit Range/Performance
P0404 Isuzu — Exhaust Gas Recirculation Open Position Performance
P0404 Jeep — Exhaust Gas Recirculation Position Sensor Performance
P0404 Lincoln — Exhaust Gas Recirculation Circuit Range/Performance
P0404 Mazda — Exhaust Gas Recirculation Control Circuit Range/Performance
P0404 Mercedes-Benz — Exhaust Gas Recirculation Circuit Range/Performance
P0404 Mercury — Exhaust Gas Recirculation Circuit Range/Performance
P0404 Mitsubishi — Exhaust Gas Recirculation Position Sensor Circuit Performance
P0404 Pontiac — Exhaust Gas Recirculation Open Position Performance
P0404 Saturn — Exhaust Gas Recirculation Open Position Performance
P0404 Volkswagen — Exhaust Gas Recirculation Control Circuit Range/Performance

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 P0404 Code

1. What are common symptoms of OBDII code P0404?

- Common symptoms of code P0404 include decreased fuel efficiency, rough idling, engine hesitation, and illuminated Check Engine light.

2. What does the OBDII code P0404 indicate?

- OBDII code P0404 indicates a problem with the Exhaust Gas Recirculation (EGR) circuit, specifically related to range/performance issues.

3. What are the possible causes of OBDII code P0404?

- Possible causes of code P0404 include a faulty EGR valve, clogged EGR passages, wiring issues, vacuum leaks, or a malfunctioning EGR position sensor.

4. How can I diagnose the cause of OBDII code P0404?

- Diagnosing code P0404 may involve checking the EGR valve operation, inspecting for clogged passages, testing the EGR position sensor, and verifying wiring integrity using a diagnostic scanner.

5. Can driving with OBDII code P0404 cause further damage to my vehicle?

- Driving with code P0404 may lead to reduced engine performance and increased emissions, but it is unlikely to cause immediate severe damage. However, prolonged driving with this code unresolved can affect engine longevity.

6. How can I repair OBDII code P0404?

- Repairing code P0404 may involve cleaning or replacing the EGR valve, clearing any blockages in the EGR system, repairing wiring issues, or replacing the EGR position sensor.

7. Is it safe to continue driving with OBDII code P0404?

- While it may be safe to drive with code P0404 in the short term, it is recommended to address the issue promptly to prevent potential engine performance issues and increased emissions.

8. Can a DIY enthusiast fix OBDII code P0404 at home?

- Depending on the underlying cause, DIY enthusiasts with mechanical knowledge and access to basic tools may be able to address code P0404 at home by following repair guides or tutorials.

9. How long does it typically take to repair OBDII code P0404?

- The repair time for code P0404 can vary based on the cause of the issue and the complexity of the repair. It may take anywhere from 1-4 hours to diagnose and fix the problem.

10. Will resetting the Check Engine light resolve OBDII code P0404?

- Simply resetting the Check Engine light without addressing the underlying issue causing code P0404 will not fix the problem. It is crucial to diagnose and repair the root cause of the code to prevent it from reoccurring.