AutoCodes – Chevrolet – P049D 2018 Chevrolet Silverado

P049D 2018 Chevrolet Silverado Code - Exhaust Gas Recirculation Position Not Learned

Quick Answer

The offset of the Exhaust Gas Recirculation (EGR) valve is checked after the offset learning has been completed in the after-run/post drive. 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: P049D 2018 Chevrolet Silverado indicates Exhaust Gas Recirculation Position Not Learned.
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 447

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 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P049D 2018 Chevrolet Silverado Description

The offset of the Exhaust Gas Recirculation (EGR) valve is checked after the offset learning has been completed in the after-run/post drive. The difference between the maximum and minimum EGR valve offset values is calculated by the Engine Control Module (ECM). If the difference is above a calibrated threshold or the offset learned value is not within a calibrated range, a fault is recognized. While the offset learning is active, the EGR valve is checked for a jammed valve. If the valve is stuck during opening or closing for a calibrated time, a fault is reported. If either of these conditions occurs, the Diagnostic Trouble Code (DTC) will be set.

OBDII Code P049D 2018 Chevrolet Silverado - Exhaust Gas Recirculation Position Not Learned - AutoCodes.com — P049D 2018 Chevrolet Silverado Code - Exhaust Gas Recirculation Position Not Learned

What does this mean?

What are the Possible Causes of the DTC P049D 2018 Chevrolet Silverado?

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

How to Fix the DTC P049D 2018 Chevrolet Silverado?

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 P049D 2018 Chevrolet Silverado 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 P049D 2018 Chevrolet Silverado code?

Need more information on how to fix the P049D 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P049D 2018 Chevrolet Silverado Code

What does the OBDII code P049D mean on a 2018 Chevrolet Silverado?

The P049D code indicates that the Exhaust Gas Recirculation (EGR) system's position is not learned, meaning the control module cannot determine the EGR valve's proper position.

What are the common symptoms of the P049D code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, rough idling, and potential engine performance issues.

What causes the P049D code to appear on a 2018 Chevrolet Silverado?

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

Can I drive my Silverado with the P049D code active?

While driving with this code is possible, it is not recommended as it may lead to reduced engine performance and increased emissions, potentially causing further damage.

How can I fix the P049D code on my Silverado?

Repairs may involve cleaning or replacing the EGR valve, inspecting and repairing wiring or connectors, or updating the engine control module (ECM) software if required.

Is the P049D code related to emissions?

Yes, the P049D code directly impacts the EGR system, which is designed to reduce harmful emissions by recirculating exhaust gases back into the engine.

How much does it cost to fix the P049D code?

Repair costs can range from $100 to $500, depending on whether the EGR valve needs cleaning or replacement and if other components are involved.

Can a dirty EGR valve cause the P049D code?

Yes, carbon buildup in the EGR valve or passages can prevent the system from functioning properly, triggering the P049D code.

How can I prevent the P049D code from recurring?

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

Will updating the ECM software clear the P049D code?

In some cases, an ECM software update may resolve the issue, but it is important to diagnose the root cause before proceeding with any updates.