P042E 2018 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 2018 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.
Code P042E 2018 GMC Sierra Description
What are the Possible Causes of the DTC P042E 2018 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 2018 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 2018 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 2018 GMC Sierra code?
Need more information on how to fix the P042E 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P042E 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P042E 2018 GMC Sierra Code
1. What does the OBDII code P042E mean on a 2018 GMC Sierra?
P042E indicates an issue with the Exhaust Gas Recirculation (EGR) system, specifically that the EGR valve is stuck in the closed position or its performance is out of specification.
2. What are the common symptoms of code P042E on a 2018 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, rough idling, increased emissions, and the Check Engine Light turning on.
3. What causes the P042E code to appear on a 2018 GMC Sierra?
Common causes include a malfunctioning EGR valve, carbon buildup obstructing the valve, wiring or connector issues, or a faulty EGR position sensor.
4. Can I drive my 2018 GMC Sierra with the P042E code?
While the truck may still be drivable, prolonged operation with this issue can lead to increased emissions, reduced engine performance, and potential damage to other components.
5. How do I fix the P042E code on my 2018 GMC Sierra?
Repairs typically involve cleaning or replacing the EGR valve, inspecting and repairing damaged wiring or connectors, or replacing the EGR position sensor if faulty.
6. How much does it cost to repair a P042E code on a 2018 GMC Sierra?
Costs vary but may range from $150 to $400, depending on whether the EGR valve is cleaned or replaced and labor charges at your service shop.
7. Can a clogged EGR valve cause the P042E code on a 2018 GMC Sierra?
Yes, carbon buildup in the EGR valve can prevent it from opening or closing properly, triggering the P042E code.
8. How can I prevent the P042E code from occurring on my 2018 GMC Sierra?
Regular maintenance, such as using high-quality fuel and periodically cleaning the EGR system, can help prevent carbon buildup and related issues.
9. Will a faulty EGR position sensor always trigger the P042E code on a 2018 GMC Sierra?
Not always, but a failing EGR position sensor can misreport the valve's position, leading to this code in some cases.
10. Can a vacuum leak cause the P042E code on a 2018 GMC Sierra?
While not a common cause, a vacuum leak affecting the EGR system could potentially interfere with its operation and trigger the code.
Discuss the causes and fixes for P042E 2018 GMC Sierra OBDII Code
Code P042E 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
