P0404 GMC 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 GMC 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.
Code P0404 GMC Description
What are the Possible Causes of the DTC P0404 GMC?
- 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 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0404 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.
Need more information about the P0404 GMC code?
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Information for Specific GMC Models
- P0404 2014 GMC Sierra — Exhaust Gas Recirculation Open Position Performance
- P0404 2015 GMC Sierra — Exhaust Gas Recirculation Open Position Performance
- P0404 2016 GMC Sierra — Exhaust Gas Recirculation Open Position Performance
- P0404 2017 GMC Sierra — Exhaust Gas Recirculation Open Position Performance
- P0404 2018 GMC Sierra — Exhaust Gas Recirculation Open Position Performance
Frequently Asked Questions about P0404 GMC Code
1. What does the OBDII code P0404 mean for a GMC vehicle?
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 common symptoms of code P0404 in a GMC?
Symptoms may include the Check Engine Light turning on, rough idling, decreased fuel efficiency, engine hesitation, or increased emissions.
3. What causes the P0404 code to appear on a GMC?
Common causes include a faulty EGR valve, carbon buildup in the EGR system, wiring or connector issues, or a malfunctioning EGR position sensor.
4. Can I drive my GMC with a P0404 code?
While the vehicle may still be drivable, continued operation with this code could lead to reduced performance, higher emissions, and potential engine damage over time.
5. How do you diagnose the P0404 code on a GMC?
A mechanic will typically use a scan tool to check the EGR system, inspect the EGR valve for functionality, check for carbon buildup, and test related wiring and sensors.
6. How can I fix the P0404 code on my GMC?
Repairs may involve cleaning or replacing the EGR valve, repairing damaged wiring, or replacing a faulty EGR position sensor.
7. How much does it cost to repair a P0404 code on a GMC?
Fixing the P0404 code can range from $150 to $400, depending on whether the EGR valve needs cleaning or replacement and labor costs.
8. Can a clogged EGR valve trigger the P0404 code?
Yes, carbon buildup in the EGR valve can prevent it from opening or closing properly, causing the P0404 code.
9. Will clearing the P0404 code solve the problem?
Clearing the code may temporarily reset it, but the underlying issue must be addressed to prevent the code from returning.
10. What tools are needed to troubleshoot the P0404 code on a GMC?
You’ll need an OBDII scanner, basic hand tools, and possibly a multimeter to check electrical connections and test the EGR valve.
Discuss the causes and fixes for P0404 GMC OBDII Code
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