AutoCodes – Chevrolet – P0490 2014 Chevrolet Silverado

P0490 2014 Chevrolet Silverado Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. 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: P0490 2014 Chevrolet Silverado indicates Exhaust Gas Recirculation Motor Control Circuit High Voltage.
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 366

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 P0490 2014 Chevrolet Silverado Description

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. The EGR position sensor provides a signal voltage that changes relative to the EGR position. The EGR position sensor information is transmitted between the EGR valve and the ECM on the signal circuit. The Mass Air Flow (MAF) sensor signal is used by the ECM to detect the proper amount of EGR flow. The ECM will close the EGR valve, then open the EGR valve to 100%. The ECM will then calculate the MAF difference and determine if the proper EGR flow has been detected. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage on the control circuit for greater than 2.5 s.

OBDII Code P0490 2014 Chevrolet Silverado - Exhaust Gas Recirculation Motor Control Circuit High Voltage - AutoCodes.com — P0490 2014 Chevrolet Silverado Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0490 2014 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
Faulty Engine Control Module (ECM)

How to Fix the DTC P0490 2014 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 P0490 2014 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 P0490 2014 Chevrolet Silverado code?

Need more information on how to fix the P0490 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0490 2014 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P0490 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0490 in a 2014 Chevrolet Silverado?

The common symptoms of code P0490 include rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0490 indicate in a 2014 Chevrolet Silverado?

Code P0490 indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit in a 2014 Chevrolet Silverado, specifically a high voltage condition.

3. What are the possible causes of OBDII code P0490 in a 2014 Chevrolet Silverado?

Possible causes of code P0490 in a 2014 Chevrolet Silverado include a faulty EGR motor, damaged wiring or connectors in the EGR circuit, or a problem with the EGR control module.

4. How can I diagnose the OBDII code P0490 in my 2014 Chevrolet Silverado?

Diagnosing code P0490 involves checking the EGR motor for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to monitor the EGR system's performance.

5. Can I drive my 2014 Chevrolet Silverado with OBDII code P0490?

It is not recommended to drive your vehicle with code P0490 present, as it can lead to reduced engine performance and potential damage to other components.

6. How serious is OBDII code P0490 in a 2014 Chevrolet Silverado?

Code P0490 should be addressed promptly to prevent further damage to the EGR system and ensure optimal engine performance in a 2014 Chevrolet Silverado.

7. How can I reset the check engine light after fixing OBDII code P0490 in my 2014 Chevrolet Silverado?

After fixing the issue causing code P0490, you can reset the check engine light using an OBDII scanner or disconnecting the battery for a few minutes.

8. Can a clogged EGR valve cause OBDII code P0490 in a 2014 Chevrolet Silverado?

While a clogged EGR valve can contribute to code P0490, the specific issue is related to the EGR motor control circuit experiencing high voltage.

9. Are there any DIY repair tips for addressing OBDII code P0490 in a 2014 Chevrolet Silverado?

DIY repair tips for code P0490 may include checking and cleaning the EGR motor and its connections, as well as ensuring the wiring harness is intact and free of damage.

10. Is it advisable to seek professional help for fixing OBDII code P0490 in a 2014 Chevrolet Silverado?

Given the complexity of diagnosing and repairing electrical issues like code P0490, it is advisable to seek professional help to accurately address and resolve the problem in a 2014 Chevrolet Silverado.