AutoCodes – GMC – P0404 2017 GMC Sierra

P0404 2017 GMC Sierra Code - Exhaust Gas Recirculation Open Position Performance

Quick Answer

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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 2017 GMC Sierra indicates Exhaust Gas Recirculation Open Position Performance.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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 201

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 19, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0404 2017 GMC Sierra Description

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. The ECM sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A signal based on the EGR valve position is sent from the EGR sensor to the ECM. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the desired position and the actual position of the EGR valve is greater than a calibrated threshold.

OBDII Code P0404 2017 GMC Sierra - Exhaust Gas Recirculation Open Position Performance - AutoCodes.com — P0404 2017 GMC Sierra Code - Exhaust Gas Recirculation Open Position Performance

What does this mean?

What are the Possible Causes of the DTC P0404 2017 GMC Sierra?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0404 2017 GMC Sierra?

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 P0404 2017 GMC Sierra 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 2017 GMC Sierra 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 P0404 2017 GMC Sierra Code

1. What does the OBDII code P0404 mean on a 2017 GMC Sierra?

P0404 indicates an issue with the Exhaust Gas Recirculation (EGR) system, specifically that the EGR valve position is not performing as expected.

2. What are the common symptoms of code P0404 in a 2017 GMC Sierra?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, or an illuminated Check Engine Light.

3. What causes the P0404 code to appear on a 2017 GMC Sierra?

Common causes include a malfunctioning EGR valve, carbon buildup in the EGR system, a faulty EGR position sensor, or wiring issues.

4. Can I drive my 2017 GMC Sierra with the P0404 code?

While driving may still be possible, it's not recommended as the issue could lead to reduced performance or further damage to the engine or emissions system.

5. How do I fix the P0404 code on my 2017 GMC Sierra?

Repairs may involve cleaning or replacing the EGR valve, checking and repairing wiring or connectors, or replacing the EGR position sensor if it's faulty.

6. How much does it cost to repair a P0404 code on a 2017 GMC Sierra?

Repair costs can vary depending on the issue but typically range from $150 to $400 for parts and labor.

7. How do I diagnose the P0404 code on my 2017 GMC Sierra?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the EGR valve and wiring, checking for carbon buildup, and testing the EGR position sensor.

8. Can a dirty EGR valve cause the P0404 code on a 2017 GMC Sierra?

Yes, carbon buildup in the EGR valve can restrict movement or cause it to stick, leading to the P0404 code.

9. Will clearing the P0404 code fix the problem on my 2017 GMC Sierra?

Clearing the code without addressing the underlying issue may temporarily turn off the Check Engine Light, but the problem will likely return.

10. How can I prevent the P0404 code from appearing on my 2017 GMC Sierra?

Regular maintenance, such as cleaning the EGR valve and using quality fuel, can help prevent carbon buildup and keep the EGR system functioning properly.