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Engine-Codes – GMC – P042E 2017 GMC Sierra

P042E 2017 GMC Sierra Code - Exhaust Gas Recirculation Closed Position Performance

Quick Answer

The P042E diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Exhaust Gas Recirculation (EGR) system. Common causes include Malfunctioning EGR valve, Clogged EGR passage, Wiring issues. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P042E 2017 GMC Sierra indicates Exhaust Gas Recirculation Closed Position Performance.
Common causes
Common causes include Malfunctioning EGR valve, Clogged EGR passage, Wiring issues.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P042E 2017 GMC Sierra Description

The P042E diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Exhaust Gas Recirculation (EGR) system. Specifically, it indicates that the EGR valve is not closing properly, leading to a performance issue in the closed position. The EGR system is responsible for recirculating a portion of the exhaust gases back into the engine's intake manifold, which helps reduce nitrogen oxide emissions and improve fuel efficiency.

OBDII Code P042E 2017 GMC Sierra - Exhaust Gas Recirculation Closed Position Performance
P042E 2017 GMC Sierra Code - Exhaust Gas Recirculation Closed Position Performance

Common Causes of P042E 2017 GMC Sierra

  1. Malfunctioning EGR valve
  2. Clogged EGR passage
  3. Wiring issues
  4. Faulty EGR position sensor
  5. Carbon buildup in the EGR system

Symptoms of P042E 2017 GMC Sierra

  1. Rough idling
  2. Engine misfires
  3. Reduced power
  4. Hesitation
  5. Decreased fuel economy

How to Fix P042E 2017 GMC Sierra

  1. Begin by inspecting the EGR valve, passage, and sensor for any visible signs of damage or blockages.
  2. Use a scan tool to monitor the EGR valve's position and check for any irregularities in its operation.
  3. Clean or replace the EGR valve, passage, or sensor as needed.
  4. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause of the issue.

Cost to Fix P042E 2017 GMC Sierra

The cost of repairing the EGR system on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. However, rates can vary significantly, so it's recommended to obtain quotes from local auto repair shops to get a more accurate estimate. Keep in mind that diagnostic time and labor rates can impact the final cost of the repair.

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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 P042E 2017 GMC Sierra Code

1. What does the OBDII code P042E mean on a 2017 GMC Sierra?

P042E indicates a problem with the Exhaust Gas Recirculation (EGR) system, specifically that the EGR valve is not transitioning properly to its closed position.

2. What are the common symptoms of code P042E on a GMC Sierra?

Symptoms may include rough idling, reduced fuel efficiency, engine hesitation or stalling, a check engine light, and increased emissions.

3. What causes the P042E code to appear on a 2017 GMC Sierra?

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

4. Can I keep driving my 2017 GMC Sierra with a P042E code?

While you might be able to drive short distances, prolonged driving with this code can result in reduced performance, increased emissions, and potential engine damage.

5. How can I fix the P042E code on my GMC Sierra?

Repairs might include cleaning or replacing the EGR valve, inspecting and repairing wiring or connectors, or replacing the EGR position sensor if it’s faulty.

6. How much does it cost to repair a P042E code on a 2017 GMC Sierra?

Costs can vary; cleaning the EGR valve may cost around $100–$300, while a full valve replacement can range from $400–$600, including parts and labor.

7. Can carbon buildup cause the P042E code on a GMC Sierra?

Yes, carbon buildup in the EGR valve or passages can restrict movement and prevent the valve from closing properly, triggering this code.

8. How can I prevent the P042E code from occurring?

Regular maintenance, including periodic cleaning of the EGR system and using high-quality fuel, can help reduce the chances of carbon buildup and EGR-related issues.

9. What tools do I need to diagnose the P042E code on my 2017 GMC Sierra?

You’ll need an OBDII scanner, a multimeter to check electrical connections, and tools to remove the EGR valve for inspection or cleaning.

10. Is the P042E code related to emissions testing on a GMC Sierra?

Yes, a P042E code can cause your vehicle to fail emissions testing due to increased exhaust emissions resulting from an improperly functioning EGR system.

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