AutoCodes – GMC – P042E 2017 GMC Sierra

P042E 2017 GMC Sierra Code - Exhaust Gas Recirculation Closed 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 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 Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection.
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.

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Code Popularity 157

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P042E 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 P042E 2017 GMC Sierra - Exhaust Gas Recirculation Closed Position Performance - AutoCodes.com — P042E 2017 GMC Sierra Code - Exhaust Gas Recirculation Closed Position Performance

What does this mean?

What are the Possible Causes of the DTC P042E 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 P042E 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 P042E 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 P042E 2017 GMC Sierra code?

Need more information on how to fix the P042E 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 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 itâ€™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 $100â€“$300, while a full valve replacement can range from $400â€“$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?

Youâ€™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.