AutoCodes – Buick – P1404 Buick

P1404 Buick Code - Exhaust Gas Recirculation Closed Position Performance

Quick Answer

The Powertrain Control Module (PCM) determines that the Exhaust Gas Recirculation (EGR) valve is stuck open if the actual EGR position and the learned closed EGR position vary by more than a predetermined value. Common causes include Carbon blockage of the pintle, Faulty Exhaust Gas Recirculation (EGR) valve. 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: P1404 Buick indicates Exhaust Gas Recirculation Closed Position Performance.
Common causes: Common causes include Carbon blockage of the pintle, Faulty Exhaust Gas Recirculation (EGR) valve.
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 36,709

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, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1404 Buick Description

The Powertrain Control Module (PCM) determines that the Exhaust Gas Recirculation (EGR) valve is stuck open if the actual EGR position and the learned closed EGR position vary by more than a predetermined value. The PCM tests for a stuck valve when the desired EGR position is at 0%. The PCM commands the EGR valve to 100% during certain driving conditions in order to clear a possible restriction from the EGR valve if the PCM determines that the valve is stuck open. The PCM retests for a stuck valve when the desired EGR position returns to 0%. A failure timer increments if the stuck EGR valve condition is still present. This Diagnostic Trouble Code (DTC) sets when the timer reaches a predetermined value.

OBDII Code P1404 Buick - Exhaust Gas Recirculation Closed Position Performance - AutoCodes.com — P1404 Buick Code - Exhaust Gas Recirculation Closed Position Performance

What does this mean?

What are the Possible Causes of the DTC P1404 Buick?

Carbon blockage of the pintle
Faulty Exhaust Gas Recirculation (EGR) valve

How to Fix the DTC P1404 Buick?

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

On some models, there is a service bulletin for the P1404 code that suggests reprogramming the Powertrain Control Module (PCM) to repair the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1404 Buick 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.

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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 P1404 Buick Code

1. What are common symptoms of OBDII code P1404 in a Buick related to Exhaust Gas Recirculation (EGR) closed position performance?

The common symptoms include rough idling, reduced engine performance, and an illuminated check engine light.

2. What are the possible causes of OBDII code P1404 in a Buick indicating EGR closed position performance issues?

Possible causes may include a malfunctioning EGR valve, a clogged EGR passage, electrical issues in the EGR system, or a faulty EGR position sensor.

3. How can I diagnose the cause of OBDII code P1404 in my Buick related to EGR closed position performance?

Diagnosis typically involves checking the EGR valve for proper operation, inspecting the EGR passage for blockages, testing the EGR position sensor, and verifying the electrical connections in the EGR system.

4. What are some repair tips for addressing OBDII code P1404 in a Buick due to EGR closed position performance problems?

Repair tips may include cleaning or replacing the EGR valve, clearing any blockages in the EGR passage, repairing or replacing damaged electrical connections, and calibrating or replacing the EGR position sensor.

5. Can OBDII code P1404 in a Buick related to EGR closed position performance affect vehicle emissions?

Yes, a malfunctioning EGR system indicated by this code can lead to increased emissions, which may cause the vehicle to fail emissions tests and contribute to environmental pollution.

6. Is it safe to continue driving my Buick with OBDII code P1404 related to EGR closed position performance issues?

It is not recommended to drive the vehicle for an extended period with this code unresolved, as it can lead to reduced engine efficiency, potential further damage, and may affect emissions compliance.

7. How can I reset OBDII code P1404 in my Buick after addressing the EGR closed position performance problem?

After repairing the issue causing the code, the code can be cleared using an OBDII scanner or by disconnecting the car battery for a few minutes to reset the system.

8. Are there any preventive maintenance measures to avoid OBDII code P1404 in a Buick related to EGR closed position performance in the future?

Regularly inspecting and cleaning the EGR system components, following the manufacturer's recommended maintenance schedule, and using high-quality fuel can help prevent EGR-related issues.

9. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P1404 in a Buick related to EGR closed position performance?

Depending on the specific issue causing the code, some repairs related to EGR system components may be manageable for DIY enthusiasts with basic knowledge and proper tools.

10. How long does it typically take to repair OBDII code P1404 in a Buick related to EGR closed position performance?

The repair time can vary based on the exact cause of the issue, but it may take anywhere from a few hours to a day to diagnose and repair the problem, depending on the complexity of the repair needed.