AutoCodes – GMC – P1404 GMC

P1404 GMC 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 GMC 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 17,835

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
Comments
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Code P1404 GMC 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 GMC - Exhaust Gas Recirculation Closed Position Performance - AutoCodes.com — P1404 GMC Code - Exhaust Gas Recirculation Closed Position Performance

What does this mean?

What are the Possible Causes of the DTC P1404 GMC?

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

How to Fix the DTC P1404 GMC?

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 GMC 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.